AppDomain.DefineDynamicAssembly AppDomain.DefineDynamicAssembly AppDomain.DefineDynamicAssembly AppDomain.DefineDynamicAssembly Method

Definition

Defines a dynamic assembly in the current application domain.

Overloads

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>)

Defines a dynamic assembly with the specified name, access mode, storage directory, evidence, permission requests, synchronization option, and custom attributes.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean)

Defines a dynamic assembly using the specified name, access mode, storage directory, evidence, permission requests, and synchronization option.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet)

Defines a dynamic assembly using the specified name, access mode, storage directory, evidence, and permission requests.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet)

Defines a dynamic assembly using the specified name, access mode, storage directory, and permission requests.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence, PermissionSet, PermissionSet, PermissionSet)

Defines a dynamic assembly using the specified name, access mode, evidence, and permission requests.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>)

Defines a dynamic assembly using the specified name, access mode, storage directory, and synchronization option.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet)

Defines a dynamic assembly using the specified name, access mode, and permission requests.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence)

Defines a dynamic assembly using the specified name, access mode, storage directory, and evidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>, SecurityContextSource) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>, SecurityContextSource) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>, SecurityContextSource)

Defines a dynamic assembly with the specified name, access mode, and custom attributes, and using the specified source for its security context.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String)

Defines a dynamic assembly using the specified name, access mode, and storage directory.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence)

Defines a dynamic assembly using the specified name, access mode, and evidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>)

Defines a dynamic assembly with the specified name, access mode, and custom attributes.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess)

Defines a dynamic assembly with the specified name and access mode.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>)

Warning

This API is now obsolete.

Defines a dynamic assembly with the specified name, access mode, storage directory, evidence, permission requests, synchronization option, and custom attributes.

public:
 System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir, System::Security::Policy::Evidence ^ evidence, System::Security::PermissionSet ^ requiredPermissions, System::Security::PermissionSet ^ optionalPermissions, System::Security::PermissionSet ^ refusedPermissions, bool isSynchronized, System::Collections::Generic::IEnumerable<System::Reflection::Emit::CustomAttributeBuilder ^> ^ assemblyAttributes);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir, System.Security.Policy.Evidence evidence, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions, bool isSynchronized, System.Collections.Generic.IEnumerable<System.Reflection.Emit.CustomAttributeBuilder> assemblyAttributes);
member this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet * bool * seq<System.Reflection.Emit.CustomAttributeBuilder> -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the dynamic assembly will be saved. If dir is null, the current directory is used.

evidence
Evidence Evidence Evidence Evidence

The evidence that is supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

requiredPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The required permissions request.

optionalPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The optional permissions request.

refusedPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The refused permissions request.

isSynchronized
Boolean Boolean Boolean Boolean

true to synchronize the creation of modules, types, and members in the dynamic assembly; otherwise, false.

assemblyAttributes
IEnumerable<CustomAttributeBuilder>

An enumerable list of attributes to be applied to the assembly, or null if there are no attributes.

Returns

A dynamic assembly with the specified name and features.

Exceptions

The Name property of name is null.

-or-

The Name property of name starts with white space, or contains a forward or backward slash.

Remarks

Use this method overload to specify attributes that do not work correctly unless they are applied when a dynamic assembly is created. For example, security attributes such as SecurityTransparentAttribute and SecurityCriticalAttribute do not work correctly if they are added after a dynamic assembly has been created.

The permission requests specified for the requiredPermissions, optionalPermissions, and refusedPermissions parameters are used only if the evidence parameter is also supplied, or if the dynamic assembly is saved and reloaded into memory.

Note

When you develop code that emits dynamic assemblies, we recommend that you include the SecurityPermissionFlag.SkipVerification flag in the refusedPermissions parameter. The inclusion of this flag ensures that the Microsoft intermediate language (MSIL) will be verified. This technique will detect the unintentional generation of unverifiable code, which otherwise is very difficult to detect. A limitation of this technique is that it also causes SecurityException to be thrown when it is used with code that demands full trust.

Only fully trusted callers can supply evidence when defining a dynamic Assembly. The runtime maps the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply null for the evidence parameter. If evidence is null, the runtime copies the permission sets (that is, the current grant and deny sets) from the caller's assembly to the dynamic assembly that is being defined, and marks the policy as resolved.

If the dynamic assembly is saved to disk, subsequent loads will get grants based on policies that are associated with the location where the dynamic assembly was saved.

If isSynchronized is true, the following methods of the resulting AssemblyBuilder will be synchronized: DefineDynamicModule, DefineResource, AddResourceFile, GetDynamicModule, SetEntryPoint, and Save. If two of these methods are called on different threads, one will block until the other is completed.

This method overload is introduced in the .NET Framework 3.5.

Security

SecurityPermission
to load an assembly with evidence. Associated enumeration: ControlEvidence.

See also

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, storage directory, evidence, permission requests, and synchronization option.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir, System::Security::Policy::Evidence ^ evidence, System::Security::PermissionSet ^ requiredPermissions, System::Security::PermissionSet ^ optionalPermissions, System::Security::PermissionSet ^ refusedPermissions, bool isSynchronized);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir, System.Security.Policy.Evidence evidence, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions, bool isSynchronized);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet * bool -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet * bool -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the dynamic assembly will be saved. If dir is null, the directory defaults to the current directory.

evidence
Evidence Evidence Evidence Evidence

The evidence supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

requiredPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The required permissions request.

optionalPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The optional permissions request.

refusedPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The refused permissions request.

isSynchronized
Boolean Boolean Boolean Boolean

true to synchronize the creation of modules, types, and members in the dynamic assembly; otherwise, false.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

The permission requests specified for requiredPermissions, optionalPermissions, and refusedPermissions are used only if evidence is also supplied, or if the dynamic assembly is saved and reloaded into memory.

Note

During the development of code that emits dynamic assemblies, it is recommended that you include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Only fully trusted callers can supply their evidence when defining a dynamic Assembly. The runtime will map the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply null for the evidence parameter. If evidence is null, the runtime copies the permission sets, that is, the current grant and deny sets, from the caller's Assembly to the dynamic Assembly being defined and marks policy as resolved.

If the dynamic Assembly is saved to disk, subsequent loads will get grants based on policies associated with the location where the Assembly was saved.

If isSynchronized is true, the following methods of the resulting AssemblyBuilder will be synchronized: DefineDynamicModule, DefineResource, AddResourceFile, GetDynamicModule, SetEntryPoint, and Save. If two of these methods are called on different threads, one will block until the other completes.

Security

SecurityPermission
to load an assembly with evidence. Associated enumeration: ControlEvidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, storage directory, evidence, and permission requests.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir, System::Security::Policy::Evidence ^ evidence, System::Security::PermissionSet ^ requiredPermissions, System::Security::PermissionSet ^ optionalPermissions, System::Security::PermissionSet ^ refusedPermissions);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default.  Please see http://go.microsoft.com/fwlink/?LinkId=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir, System.Security.Policy.Evidence evidence, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the assembly will be saved. If dir is null, the directory defaults to the current directory.

evidence
Evidence Evidence Evidence Evidence

The evidence supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

requiredPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The required permissions request.

optionalPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The optional permissions request.

refusedPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The refused permissions request.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

The permission requests specified for requiredPermissions, optionalPermissions, and refusedPermissions are used only if evidence is also supplied, or if the dynamic assembly is saved and reloaded into memory.

Note

During the development of code that emits dynamic assemblies, it is recommended that you include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Only fully trusted callers can supply their evidence when defining a dynamic Assembly. The runtime will map the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply a null evidence. If evidence is null, the runtime copies the permission sets, that is, the current grant and deny sets, from the caller's Assembly to the dynamic Assembly being defined and marks policy as resolved.

If the dynamic Assembly is saved to disk, subsequent loads will get grants based on policies associated with the location where the Assembly was saved.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

Security

SecurityPermission
to load an assembly with evidence. Associated enumeration: ControlEvidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, PermissionSet, PermissionSet, PermissionSet)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, storage directory, and permission requests.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir, System::Security::PermissionSet ^ requiredPermissions, System::Security::PermissionSet ^ optionalPermissions, System::Security::PermissionSet ^ refusedPermissions);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder
Public Function DefineDynamicAssembly (name As AssemblyName, access As AssemblyBuilderAccess, dir As String, requiredPermissions As PermissionSet, optionalPermissions As PermissionSet, refusedPermissions As PermissionSet) As AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the assembly will be saved. If dir is null, the directory defaults to the current directory.

requiredPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The required permissions request.

optionalPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The optional permissions request.

refusedPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The refused permissions request.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

The permission requests specified for requiredPermissions, optionalPermissions, and refusedPermissions are not used unless the dynamic assembly has been saved and reloaded into memory. To specify permission requests for a transient assembly that is never saved to disk, use an overload of the DefineDynamicAssembly method that specifies evidence as well as requested permissions, and supply an Evidence object.

Note

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence, PermissionSet, PermissionSet, PermissionSet)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, evidence, and permission requests.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::Security::Policy::Evidence ^ evidence, System::Security::PermissionSet ^ requiredPermissions, System::Security::PermissionSet ^ optionalPermissions, System::Security::PermissionSet ^ refusedPermissions);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, System.Security.Policy.Evidence evidence, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * System.Security.Policy.Evidence * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

evidence
Evidence Evidence Evidence Evidence

The evidence supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

requiredPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The required permissions request.

optionalPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The optional permissions request.

refusedPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The refused permissions request.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

The permission requests specified for requiredPermissions, optionalPermissions, and refusedPermissions are used only if evidence is also supplied, or if the dynamic assembly is saved and reloaded into memory.

Note

During the development of code that emits dynamic assemblies, it is recommended that you include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Only fully trusted callers can supply their evidence when defining a dynamic Assembly. The runtime will map the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply a null evidence. If evidence is null, the runtime copies the permission sets, that is, the current grant and deny sets, from the caller's Assembly to the dynamic Assembly being defined and marks policy as resolved.

If the dynamic Assembly is saved to disk, subsequent loads will get grants based on policies associated with the location where the Assembly was saved.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

Security

SecurityPermission
to load an assembly with evidence. Associated enumeration: ControlEvidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>)

Defines a dynamic assembly using the specified name, access mode, storage directory, and synchronization option.

public:
 System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir, bool isSynchronized, System::Collections::Generic::IEnumerable<System::Reflection::Emit::CustomAttributeBuilder ^> ^ assemblyAttributes);
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir, bool isSynchronized, System.Collections.Generic.IEnumerable<System.Reflection.Emit.CustomAttributeBuilder> assemblyAttributes);
member this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * bool * seq<System.Reflection.Emit.CustomAttributeBuilder> -> System.Reflection.Emit.AssemblyBuilder
Public Function DefineDynamicAssembly (name As AssemblyName, access As AssemblyBuilderAccess, dir As String, isSynchronized As Boolean, assemblyAttributes As IEnumerable(Of CustomAttributeBuilder)) As AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the dynamic assembly will be saved. If dir is null, the current directory is used.

isSynchronized
Boolean Boolean Boolean Boolean

true to synchronize the creation of modules, types, and members in the dynamic assembly; otherwise, false.

assemblyAttributes
IEnumerable<CustomAttributeBuilder>

An enumerable list of attributes to be applied to the assembly, or null if there are no attributes.

Returns

A dynamic assembly with the specified name and features.

Exceptions

The Name property of name is null.

-or-

The Name property of name starts with white space, or contains a forward or backward slash.

Remarks

Use this method overload to specify attributes that do not work correctly unless they are applied when a dynamic assembly is created. For example, security attributes such as SecurityTransparentAttribute and SecurityCriticalAttribute do not work correctly if they are added after a dynamic assembly has been created.

If isSynchronized is true, the following methods of the resulting AssemblyBuilder will be synchronized: DefineDynamicModule, DefineResource, AddResourceFile, GetDynamicModule, SetEntryPoint, and Save. If two of these methods are called on different threads, one will block until the other is completed.

See also

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, PermissionSet, PermissionSet, PermissionSet)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, and permission requests.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::Security::PermissionSet ^ requiredPermissions, System::Security::PermissionSet ^ optionalPermissions, System::Security::PermissionSet ^ refusedPermissions);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default.  See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, System.Security.PermissionSet requiredPermissions, System.Security.PermissionSet optionalPermissions, System.Security.PermissionSet refusedPermissions);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * System.Security.PermissionSet * System.Security.PermissionSet * System.Security.PermissionSet -> System.Reflection.Emit.AssemblyBuilder
Public Function DefineDynamicAssembly (name As AssemblyName, access As AssemblyBuilderAccess, requiredPermissions As PermissionSet, optionalPermissions As PermissionSet, refusedPermissions As PermissionSet) As AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

requiredPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The required permissions request.

optionalPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The optional permissions request.

refusedPermissions
PermissionSet PermissionSet PermissionSet PermissionSet

The refused permissions request.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

The permission requests specified for requiredPermissions, optionalPermissions, and refusedPermissions are not used unless the dynamic assembly has been saved and reloaded into memory. To specify permission requests for a transient assembly that is never saved to disk, use an overload of the DefineDynamicAssembly method that specifies evidence as well as requested permissions, and supply an Evidence object.

Note

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload .

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, storage directory, and evidence.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir, System::Security::Policy::Evidence ^ evidence);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Methods which use evidence to sandbox are obsolete and will be removed in a future release of the .NET Framework. Please use an overload of DefineDynamicAssembly which does not take an Evidence parameter. See http://go.microsoft.com/fwlink/?LinkId=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir, System.Security.Policy.Evidence evidence);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string * System.Security.Policy.Evidence -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the assembly will be saved. If dir is null, the directory defaults to the current directory.

evidence
Evidence Evidence Evidence Evidence

The evidence supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

Only fully trusted callers can supply their evidence when defining a dynamic Assembly. The runtime will map the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply a null evidence. If evidence is null, the runtime copies the permission sets, that is, the current grant and deny sets, from the caller's Assembly to the dynamic Assembly being defined and marks policy as resolved.

If the dynamic Assembly is saved to disk, subsequent loads will get grants based on policies associated with the location where the Assembly was saved.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

Note

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Security

SecurityPermission
to load an assembly with evidence. Associated enumeration: ControlEvidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>, SecurityContextSource) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>, SecurityContextSource) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>, SecurityContextSource)

Defines a dynamic assembly with the specified name, access mode, and custom attributes, and using the specified source for its security context.

public:
 System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::Collections::Generic::IEnumerable<System::Reflection::Emit::CustomAttributeBuilder ^> ^ assemblyAttributes, System::Security::SecurityContextSource securityContextSource);
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, System.Collections.Generic.IEnumerable<System.Reflection.Emit.CustomAttributeBuilder> assemblyAttributes, System.Security.SecurityContextSource securityContextSource);
member this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * seq<System.Reflection.Emit.CustomAttributeBuilder> * System.Security.SecurityContextSource -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

assemblyAttributes
IEnumerable<CustomAttributeBuilder>

An enumerable list of attributes to be applied to the assembly, or null if there are no attributes.

securityContextSource
SecurityContextSource SecurityContextSource SecurityContextSource SecurityContextSource

The source of the security context.

Returns

A dynamic assembly with the specified name and features.

Exceptions

The Name property of name is null.

-or-

The Name property of name starts with white space, or contains a forward or backward slash.

The value of securityContextSource was not one of the enumeration values.

Remarks

Use this method overload to specify attributes that do not work correctly unless they are applied when a dynamic assembly is created. For example, security attributes such as SecurityTransparentAttribute and SecurityCriticalAttribute do not work correctly if they are added after a dynamic assembly has been created.

This method should be used only to define a dynamic assembly in the current application domain. For more information about this restriction, see the Load(AssemblyName) method overload.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String)

Defines a dynamic assembly using the specified name, access mode, and storage directory.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::String ^ dir);
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, string dir);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * string -> System.Reflection.Emit.AssemblyBuilder
Public Function DefineDynamicAssembly (name As AssemblyName, access As AssemblyBuilderAccess, dir As String) As AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

dir
String String String String

The name of the directory where the assembly will be saved. If dir is null, the directory defaults to the current directory.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

Note

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, Evidence)

Warning

This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, and evidence.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::Security::Policy::Evidence ^ evidence);
[System.Obsolete("Declarative security for assembly level is no longer enforced")]
[System.Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default.  See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, System.Security.Policy.Evidence evidence);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * System.Security.Policy.Evidence -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * System.Security.Policy.Evidence -> System.Reflection.Emit.AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

access
AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

evidence
Evidence Evidence Evidence Evidence

The evidence supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

Returns

A dynamic assembly with the specified name and features.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and the AssemblyResolve event.

First, the code example tries to create an instance of MyDynamicType by calling the CreateInstance method with an invalid assembly name, and catches the resulting exception.

The code example then adds an event handler for the AssemblyResolve event, and again tries to create an instance ofMyDynamicType. During the call to CreateInstance, the AssemblyResolve event is raised for the invalid assembly. The event handler creates a dynamic assembly that contains a type named MyDynamicType, gives the type a parameterless constructor, and returns the new dynamic assembly. The call to CreateInstance then finishes successfully, and the constructor for MyDynamicType displays a message at the console.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

Only fully trusted callers can supply their evidence when defining a dynamic Assembly. The runtime will map the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply a null evidence. If evidence is null, the runtime copies the permission sets, that is, the current grant and deny sets, from the caller's Assembly to the dynamic Assembly being defined and marks policy as resolved.

If the dynamic Assembly is saved to disk, subsequent loads will get grants based on policies associated with the location where the Assembly was saved.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

Note

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Security

SecurityPermission
to load an assembly with evidence. Associated enumeration: ControlEvidence.

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>)

Defines a dynamic assembly with the specified name, access mode, and custom attributes.

public:
 System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access, System::Collections::Generic::IEnumerable<System::Reflection::Emit::CustomAttributeBuilder ^> ^ assemblyAttributes);
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access, System.Collections.Generic.IEnumerable<System.Reflection.Emit.CustomAttributeBuilder> assemblyAttributes);
member this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess * seq<System.Reflection.Emit.CustomAttributeBuilder> -> System.Reflection.Emit.AssemblyBuilder
Public Function DefineDynamicAssembly (name As AssemblyName, access As AssemblyBuilderAccess, assemblyAttributes As IEnumerable(Of CustomAttributeBuilder)) As AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

assemblyAttributes
IEnumerable<CustomAttributeBuilder>

An enumerable list of attributes to be applied to the assembly, or null if there are no attributes.

Returns

A dynamic assembly with the specified name and features.

Exceptions

The Name property of name is null.

-or-

The Name property of name starts with white space, or contains a forward or backward slash.

Examples

The following code sample shows how to create a dynamic assembly that has the SecurityTransparentAttribute. The attribute must be specified as an element of an array of CustomAttributeBuilder objects.

The first step in creating the CustomAttributeBuilder is to obtain a constructor for the attribute. The constructor has no parameters, so the GetConstructor method is called with an empty array of Type objects to represent the types of the parameters. The second step is to pass the resulting ConstructorInfo object to the constructor for the CustomAttributeBuilder class, together with an empty array of type Object to represent the arguments.

The resulting CustomAttributeBuilder is then passed to the DefineDynamicAssembly method as the only element of an array.

The example code defines a module and a type in the new dynamic assembly, and then displays the assembly's attributes.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
using namespace System::Security;

void main()
{
    // Create a CustomAttributeBuilder for the assembly attribute. 
    // 
    // SecurityTransparentAttribute has a parameterless constructor, 
    // which is retrieved by passing an array of empty types for the
    // constructor's parameter types. The CustomAttributeBuilder is 
    // then created by passing the ConstructorInfo and an empty array
    // of objects to represent the parameters.
    //
    ConstructorInfo^ transparentCtor = 
        SecurityTransparentAttribute::typeid->GetConstructor(
            Type::EmptyTypes);
    CustomAttributeBuilder^ transparent = gcnew CustomAttributeBuilder(
        transparentCtor,
        gcnew array<Object^> {} );
      
    // Create a dynamic assembly using the attribute. The attribute is
    // passed as an array with one element.
    AssemblyName^ aName = gcnew AssemblyName("EmittedAssembly");
    AssemblyBuilder^ ab = AppDomain::CurrentDomain->DefineDynamicAssembly( 
        aName, 
        AssemblyBuilderAccess::Run,
        gcnew array<CustomAttributeBuilder^> { transparent } );

    ModuleBuilder^ mb = ab->DefineDynamicModule( aName->Name );
    TypeBuilder^ tb = mb->DefineType( 
        "MyDynamicType", 
        TypeAttributes::Public );
    tb->CreateType();

    Console::WriteLine("{0}\nAssembly attributes:", ab);
    for each (Attribute^ attr in ab->GetCustomAttributes(true))
    {
        Console::WriteLine("\t{0}", attr);
    }
};

/* This code example produces the following output:

EmittedAssembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
Assembly attributes:
        System.Security.SecurityTransparentAttribute
 */
using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Security;

class Example
{
    static void Main()
    {
        // Create a CustomAttributeBuilder for the assembly attribute. 
        // 
        // SecurityTransparentAttribute has a parameterless constructor, 
        // which is retrieved by passing an array of empty types for the
        // constructor's parameter types. The CustomAttributeBuilder is 
        // then created by passing the ConstructorInfo and an empty array
        // of objects to represent the parameters.
        //
        ConstructorInfo transparentCtor = 
            typeof(SecurityTransparentAttribute).GetConstructor(
                Type.EmptyTypes);
        CustomAttributeBuilder transparent = new CustomAttributeBuilder(
            transparentCtor,
            new Object[] {} );
      
        // Create a dynamic assembly using the attribute. The attribute is
        // passed as an array with one element.
        AssemblyName aName = new AssemblyName("EmittedAssembly");
        AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly( 
            aName, 
            AssemblyBuilderAccess.Run,
            new CustomAttributeBuilder[] { transparent } );

        ModuleBuilder mb = ab.DefineDynamicModule( aName.Name );
        TypeBuilder tb = mb.DefineType( 
            "MyDynamicType", 
            TypeAttributes.Public );
        tb.CreateType();

        Console.WriteLine("{0}\nAssembly attributes:", ab);
        foreach (Attribute attr in ab.GetCustomAttributes(true))
        {
            Console.WriteLine("\t{0}", attr);
        }
    }
}

/* This code example produces the following output:

EmittedAssembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
Assembly attributes:
        System.Security.SecurityTransparentAttribute
 */
Imports System
Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Security

Module Example

    Sub Main()
    
        ' Create a CustomAttributeBuilder for the assembly attribute. 
        ' 
        ' SecurityTransparentAttribute has a parameterless constructor, 
        ' which is retrieved by passing an array of empty types for the
        ' constructor's parameter types. The CustomAttributeBuilder is 
        ' then created by passing the ConstructorInfo and an empty array
        ' of objects to represent the parameters.
        '
        Dim transparentCtor As ConstructorInfo = _
            GetType(SecurityTransparentAttribute).GetConstructor( _
                Type.EmptyTypes)
        Dim transparent As New CustomAttributeBuilder( _
            transparentCtor, _
            New Object() {} )
      
        ' Create a dynamic assembly Imports the attribute. The attribute is
        ' passed as an array with one element.
        Dim aName As New AssemblyName("EmittedAssembly")
        Dim ab As AssemblyBuilder = _
            AppDomain.CurrentDomain.DefineDynamicAssembly( _
                aName, _
                AssemblyBuilderAccess.Run, _
                New CustomAttributeBuilder() { transparent } )

        Dim mb As ModuleBuilder = ab.DefineDynamicModule( aName.Name )
        Dim tb As TypeBuilder = mb.DefineType( _
            "MyDynamicType", _
            TypeAttributes.Public )
        tb.CreateType()

        Console.WriteLine("{0}" & vbLf & "Assembly attributes:", ab)
        For Each attr As Attribute In ab.GetCustomAttributes(True)
            Console.WriteLine(vbTab & "{0}", attr)
        Next
    End Sub
End Module

' This code example produces the following output:
'
'EmittedAssembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
'Assembly attributes:
'        System.Security.SecurityTransparentAttribute

Remarks

Use this method overload to specify attributes that do not work correctly unless they are applied when a dynamic assembly is created. For example, security attributes such as SecurityTransparentAttribute and SecurityCriticalAttribute do not work correctly if they are added after a dynamic assembly has been created.

This method should be used only to define a dynamic assembly in the current application domain. For more information about this restriction, see the Load(AssemblyName) method overload.

This method overload is introduced in the .NET Framework 3.5.

See also

DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess) DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess)

Defines a dynamic assembly with the specified name and access mode.

public:
 virtual System::Reflection::Emit::AssemblyBuilder ^ DefineDynamicAssembly(System::Reflection::AssemblyName ^ name, System::Reflection::Emit::AssemblyBuilderAccess access);
public System.Reflection.Emit.AssemblyBuilder DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access);
abstract member DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess -> System.Reflection.Emit.AssemblyBuilder
override this.DefineDynamicAssembly : System.Reflection.AssemblyName * System.Reflection.Emit.AssemblyBuilderAccess -> System.Reflection.Emit.AssemblyBuilder
Public Function DefineDynamicAssembly (name As AssemblyName, access As AssemblyBuilderAccess) As AssemblyBuilder

Parameters

name
AssemblyName AssemblyName AssemblyName AssemblyName

The unique identity of the dynamic assembly.

Returns

A dynamic assembly with the specified name and access mode.

Implements

Exceptions

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

Examples

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {
         
         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {
      
      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   static void InstantiateMyDynamicType(AppDomain domain) {
      try {
         // You must supply a valid fully qualified assembly name here. 
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }   

   static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args) {
      return DefineDynamicAssembly((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyDynamicAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule");
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public);
      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyDynamicType(currentDomain)   'Failed!
      
      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler
      
      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main
   
   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyDynamicType
   
   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler
   
   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API.

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Remarks

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName) method overload.

Note

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and include SecurityPermissionFlag.SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Applies to