AppDomain.Load AppDomain.Load AppDomain.Load AppDomain.Load Method

Definition

Loads an Assembly into this application domain.

Overloads

Load(Byte[]) Load(Byte[]) Load(Byte[]) Load(Byte[])

Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly.

Load(AssemblyName) Load(AssemblyName) Load(AssemblyName) Load(AssemblyName)

Loads an Assembly given its AssemblyName.

Load(String) Load(String) Load(String) Load(String)

Loads an Assembly given its display name.

Load(Byte[], Byte[]) Load(Byte[], Byte[]) Load(Byte[], Byte[]) Load(Byte[], Byte[])

Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly. The raw bytes representing the symbols for the Assembly are also loaded.

Load(AssemblyName, Evidence) Load(AssemblyName, Evidence) Load(AssemblyName, Evidence) Load(AssemblyName, Evidence)

Loads an Assembly given its AssemblyName.

Load(String, Evidence) Load(String, Evidence) Load(String, Evidence) Load(String, Evidence)

Loads an Assembly given its display name.

Load(Byte[], Byte[], Evidence) Load(Byte[], Byte[], Evidence) Load(Byte[], Byte[], Evidence) Load(Byte[], Byte[], Evidence)

Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly. The raw bytes representing the symbols for the Assembly are also loaded.

Load(Byte[]) Load(Byte[]) Load(Byte[]) Load(Byte[])

Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly.

public:
 virtual System::Reflection::Assembly ^ Load(cli::array <System::Byte> ^ rawAssembly);
public System.Reflection.Assembly Load (byte[] rawAssembly);
abstract member Load : byte[] -> System.Reflection.Assembly
override this.Load : byte[] -> System.Reflection.Assembly
Public Function Load (rawAssembly As Byte()) As Assembly
Parameters
rawAssembly
Byte[]

An array of type byte that is a COFF-based image containing an emitted assembly.

Returns

The loaded assembly.

Implements
Exceptions

rawAssembly is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and rawAssembly was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

Examples

The following sample demonstrates the use of loading a raw assembly.

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

}


// Loads the content of a file to a Byte array.
array<Byte>^ loadFile( String^ filename )
{
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   array<Byte>^buffer = gcnew array<Byte>((int)fs->Length);
   fs->Read( buffer, 0, buffer->Length );
   fs->Close();
   return buffer;
}


// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
void EmitAssembly( AppDomain^ domain )
{
   AssemblyName^ assemblyName = gcnew AssemblyName;
   assemblyName->Name = "MyAssembly";
   AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Save );
   ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyModule", "temp.dll", true );
   TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyType", TypeAttributes::Public );
   ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
   ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
   ilGenerator->EmitWriteLine( "MyType instantiated!" );
   ilGenerator->Emit( OpCodes::Ret );
   typeBuilder->CreateType();
   assemblyBuilder->Save( "temp.dll" );
}

ref class Resolver
{
public:
   static Assembly^ MyResolver( Object^ sender, ResolveEventArgs^ args )
   {
      AppDomain^ domain = dynamic_cast<AppDomain^>(sender);
      
      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly( domain );
      array<Byte>^rawAssembly = loadFile( "temp.dll" );
      array<Byte>^rawSymbolStore = loadFile( "temp.pdb" );
      Assembly^ assembly = domain->Load( rawAssembly, rawSymbolStore );
      return assembly;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   InstantiateMyType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Resolver::MyResolver );
   InstantiateMyType( currentDomain ); // OK!
}

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

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;
      
      InstantiateMyType(currentDomain);   // Failed!

      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);
      
      InstantiateMyType(currentDomain);   // OK!
   }
   
   static void InstantiateMyType(AppDomain domain) {
      try {
	 // You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }
   
   // Loads the content of a file to a byte array. 
   static byte[] loadFile(string filename) {
      FileStream fs = new FileStream(filename, FileMode.Open);
      byte[] buffer = new byte[(int) fs.Length];
      fs.Read(buffer, 0, buffer.Length);
      fs.Close();
   
      return buffer;
   }   

   static Assembly MyResolver(object sender, ResolveEventArgs args) {
      AppDomain domain = (AppDomain) sender;

      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly(domain);
      
      byte[] rawAssembly = loadFile("temp.dll");
      byte[] rawSymbolStore = loadFile("temp.pdb");
      Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);

      return assembly;
   }
   
   // Creates a dynamic assembly with symbol information
   // and saves them to temp.dll and temp.pdb
   static void EmitAssembly(AppDomain domain) {
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true);
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public);

      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      ilGenerator.EmitWriteLine("MyType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();
      
      assemblyBuilder.Save("temp.dll");
   }
}
Imports System
Imports System.IO
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyType(currentDomain)      ' Failed!

      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolver
      
      InstantiateMyType(currentDomain)      ' OK!
   End Sub 'Main
   
   
   Sub InstantiateMyType(domain As AppDomain)
      Try
	 ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyType
   
   
   ' Loads the content of a file to a byte array. 
   Function loadFile(filename As String) As Byte()
      Dim fs As New FileStream(filename, FileMode.Open)
      Dim buffer(CInt(fs.Length)) As Byte
      fs.Read(buffer, 0, buffer.Length)
      fs.Close()
      
      Return buffer
   End Function 'loadFile
   
   
   Function MyResolver(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Dim domain As AppDomain = DirectCast(sender, AppDomain)
      
      ' Once the files are generated, this call is
      ' actually no longer necessary.
      EmitAssembly(domain)
      
      Dim rawAssembly As Byte() = loadFile("temp.dll")
      Dim rawSymbolStore As Byte() = loadFile("temp.pdb")
      Dim myAssembly As System.Reflection.Assembly = domain.Load(rawAssembly, rawSymbolStore)
      
      Return myAssembly
   End Function 'MyResolver
   
   
   ' Creates a dynamic assembly with symbol information
   ' and saves them to temp.dll and temp.pdb
   Sub EmitAssembly(domain As AppDomain)
      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", True)
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)
      
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      ilGenerator.EmitWriteLine("MyType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      assemblyBuilder.Save("temp.dll")
   End Sub 'EmitAssembly

End Module 'Test

Remarks

Beginning with the .NET Framework 4, the trust level of an assembly that is loaded by using this method is the same as the trust level of the application domain.

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

For information that is common to all overloads of this method, see the Load(AssemblyName) method overload.

Security

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

Load(AssemblyName) Load(AssemblyName) Load(AssemblyName) Load(AssemblyName)

Loads an Assembly given its AssemblyName.

public:
 virtual System::Reflection::Assembly ^ Load(System::Reflection::AssemblyName ^ assemblyRef);
public System.Reflection.Assembly Load (System.Reflection.AssemblyName assemblyRef);
abstract member Load : System.Reflection.AssemblyName -> System.Reflection.Assembly
override this.Load : System.Reflection.AssemblyName -> System.Reflection.Assembly
Public Function Load (assemblyRef As AssemblyName) As Assembly
Parameters
assemblyRef
AssemblyName AssemblyName AssemblyName AssemblyName

An object that describes the assembly to load.

Returns

The loaded assembly.

Implements
Exceptions

assemblyRef is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and assemblyRef was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

Remarks

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

If a version of the requested assembly is already loaded, this method returns the loaded assembly, even if a different version is requested.

Supplying a partial assembly name for assemblyRef is not recommended. (A partial name omits one or more of culture, version, or public key token. For overloads that take a string instead of an AssemblyName object, "MyAssembly, Version=1.0.0.0" is an example of a partial name and "MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=18ab3442da84b47" is an example of a full name.) Using partial names has a negative effect on performance. In addition, a partial assembly name can load an assembly from the global assembly cache only if there is an exact copy of the assembly in the application base directory (BaseDirectory or AppDomainSetup.ApplicationBase).

If the current AppDomain object represents application domain A, and the Load method is called from application domain B, the assembly is loaded into both application domains. For example, the following code loads MyAssembly into the new application domain ChildDomain and also into the application domain where the code executes:

AppDomain^ ad = AppDomain::CreateDomain("ChildDomain");
ad->Load("MyAssembly");
AppDomain ad = AppDomain.CreateDomain("ChildDomain");
ad.Load("MyAssembly");
Dim ad As AppDomain  = AppDomain.CreateDomain("ChildDomain")
ad.Load("MyAssembly")

The assembly is loaded into both domains because Assembly does not derive from MarshalByRefObject, and therefore the return value of the Load method cannot be marshaled. Instead, the common language runtime tries to load the assembly into the calling application domain. The assemblies that are loaded into the two application domains might be different if the path settings for the two application domains are different.

Note

If both the AssemblyName.Name property and the AssemblyName.CodeBase property are set, the first attempt to load the assembly uses the display name (including version, culture, and so on, as returned by the Assembly.FullName property). If the file is not found, the CodeBase property is used to search for the assembly. If the assembly is found using CodeBase, the display name is matched against the assembly. If the match fails, a FileLoadException is thrown.

Security

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

Load(String) Load(String) Load(String) Load(String)

Loads an Assembly given its display name.

public:
 virtual System::Reflection::Assembly ^ Load(System::String ^ assemblyString);
public System.Reflection.Assembly Load (string assemblyString);
abstract member Load : string -> System.Reflection.Assembly
override this.Load : string -> System.Reflection.Assembly
Public Function Load (assemblyString As String) As Assembly
Parameters
assemblyString
String String String String

The display name of the assembly. See FullName.

Returns

The loaded assembly.

Implements
Exceptions

assemblyString is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and assemblyString was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

Remarks

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

For information that is common to all overloads of this method, see the Load(AssemblyName) method overload.

Security

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

WebPermission
for the ability to access the location of the assembly if the assembly is not local.

Load(Byte[], Byte[]) Load(Byte[], Byte[]) Load(Byte[], Byte[]) Load(Byte[], Byte[])

Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly. The raw bytes representing the symbols for the Assembly are also loaded.

public:
 virtual System::Reflection::Assembly ^ Load(cli::array <System::Byte> ^ rawAssembly, cli::array <System::Byte> ^ rawSymbolStore);
public System.Reflection.Assembly Load (byte[] rawAssembly, byte[] rawSymbolStore);
abstract member Load : byte[] * byte[] -> System.Reflection.Assembly
override this.Load : byte[] * byte[] -> System.Reflection.Assembly
Public Function Load (rawAssembly As Byte(), rawSymbolStore As Byte()) As Assembly
Parameters
rawAssembly
Byte[]

An array of type byte that is a COFF-based image containing an emitted assembly.

rawSymbolStore
Byte[]

An array of type byte containing the raw bytes representing the symbols for the assembly.

Returns

The loaded assembly.

Implements
Exceptions

rawAssembly is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and rawAssembly was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

Examples

The following sample demonstrates the use of loading a raw assembly.

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

}


// Loads the content of a file to a Byte array.
array<Byte>^ loadFile( String^ filename )
{
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   array<Byte>^buffer = gcnew array<Byte>((int)fs->Length);
   fs->Read( buffer, 0, buffer->Length );
   fs->Close();
   return buffer;
}


// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
void EmitAssembly( AppDomain^ domain )
{
   AssemblyName^ assemblyName = gcnew AssemblyName;
   assemblyName->Name = "MyAssembly";
   AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Save );
   ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyModule", "temp.dll", true );
   TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyType", TypeAttributes::Public );
   ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
   ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
   ilGenerator->EmitWriteLine( "MyType instantiated!" );
   ilGenerator->Emit( OpCodes::Ret );
   typeBuilder->CreateType();
   assemblyBuilder->Save( "temp.dll" );
}

ref class Resolver
{
public:
   static Assembly^ MyResolver( Object^ sender, ResolveEventArgs^ args )
   {
      AppDomain^ domain = dynamic_cast<AppDomain^>(sender);
      
      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly( domain );
      array<Byte>^rawAssembly = loadFile( "temp.dll" );
      array<Byte>^rawSymbolStore = loadFile( "temp.pdb" );
      Assembly^ assembly = domain->Load( rawAssembly, rawSymbolStore );
      return assembly;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   InstantiateMyType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Resolver::MyResolver );
   InstantiateMyType( currentDomain ); // OK!
}

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

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;
      
      InstantiateMyType(currentDomain);   // Failed!

      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);
      
      InstantiateMyType(currentDomain);   // OK!
   }
   
   static void InstantiateMyType(AppDomain domain) {
      try {
	 // You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }
   
   // Loads the content of a file to a byte array. 
   static byte[] loadFile(string filename) {
      FileStream fs = new FileStream(filename, FileMode.Open);
      byte[] buffer = new byte[(int) fs.Length];
      fs.Read(buffer, 0, buffer.Length);
      fs.Close();
   
      return buffer;
   }   

   static Assembly MyResolver(object sender, ResolveEventArgs args) {
      AppDomain domain = (AppDomain) sender;

      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly(domain);
      
      byte[] rawAssembly = loadFile("temp.dll");
      byte[] rawSymbolStore = loadFile("temp.pdb");
      Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);

      return assembly;
   }
   
   // Creates a dynamic assembly with symbol information
   // and saves them to temp.dll and temp.pdb
   static void EmitAssembly(AppDomain domain) {
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true);
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public);

      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      ilGenerator.EmitWriteLine("MyType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();
      
      assemblyBuilder.Save("temp.dll");
   }
}
Imports System
Imports System.IO
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyType(currentDomain)      ' Failed!

      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolver
      
      InstantiateMyType(currentDomain)      ' OK!
   End Sub 'Main
   
   
   Sub InstantiateMyType(domain As AppDomain)
      Try
	 ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyType
   
   
   ' Loads the content of a file to a byte array. 
   Function loadFile(filename As String) As Byte()
      Dim fs As New FileStream(filename, FileMode.Open)
      Dim buffer(CInt(fs.Length)) As Byte
      fs.Read(buffer, 0, buffer.Length)
      fs.Close()
      
      Return buffer
   End Function 'loadFile
   
   
   Function MyResolver(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Dim domain As AppDomain = DirectCast(sender, AppDomain)
      
      ' Once the files are generated, this call is
      ' actually no longer necessary.
      EmitAssembly(domain)
      
      Dim rawAssembly As Byte() = loadFile("temp.dll")
      Dim rawSymbolStore As Byte() = loadFile("temp.pdb")
      Dim myAssembly As System.Reflection.Assembly = domain.Load(rawAssembly, rawSymbolStore)
      
      Return myAssembly
   End Function 'MyResolver
   
   
   ' Creates a dynamic assembly with symbol information
   ' and saves them to temp.dll and temp.pdb
   Sub EmitAssembly(domain As AppDomain)
      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", True)
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)
      
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      ilGenerator.EmitWriteLine("MyType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      assemblyBuilder.Save("temp.dll")
   End Sub 'EmitAssembly

End Module 'Test

Remarks

Beginning with the .NET Framework 4, the trust level of an assembly that is loaded by using this method is the same as the trust level of the application domain.

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

For information that is common to all overloads of this method, see the Load(AssemblyName) method overload.

Security

WebPermission
for reading a URI that does not begin with "file://".

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

Load(AssemblyName, Evidence) Load(AssemblyName, Evidence) Load(AssemblyName, Evidence) Load(AssemblyName, Evidence)

Warning

This API is now obsolete.

Loads an Assembly given its AssemblyName.

public:
 virtual System::Reflection::Assembly ^ Load(System::Reflection::AssemblyName ^ assemblyRef, System::Security::Policy::Evidence ^ assemblySecurity);
[System.Obsolete("Use an overload that does not take an Evidence parameter")]
[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 Load which does not take an Evidence parameter. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Assembly Load (System.Reflection.AssemblyName assemblyRef, System.Security.Policy.Evidence assemblySecurity);
abstract member Load : System.Reflection.AssemblyName * System.Security.Policy.Evidence -> System.Reflection.Assembly
override this.Load : System.Reflection.AssemblyName * System.Security.Policy.Evidence -> System.Reflection.Assembly
Public Function Load (assemblyRef As AssemblyName, assemblySecurity As Evidence) As Assembly
Parameters
assemblyRef
AssemblyName AssemblyName AssemblyName AssemblyName

An object that describes the assembly to load.

assemblySecurity
Evidence Evidence Evidence Evidence

Evidence for loading the assembly.

Returns

The loaded assembly.

Implements
Exceptions

assemblyRef is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and assemblyRef was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

Remarks

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

For information that is common to all overloads of this method, see the Load(AssemblyName) method overload.

Security

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

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

WebPermission
for reading a path that is not in the form "file://" or "\\\UNC\dir\\" or "c:\\".

Load(String, Evidence) Load(String, Evidence) Load(String, Evidence) Load(String, Evidence)

Warning

This API is now obsolete.

Loads an Assembly given its display name.

public:
 virtual System::Reflection::Assembly ^ Load(System::String ^ assemblyString, System::Security::Policy::Evidence ^ assemblySecurity);
[System.Obsolete("Use an overload that does not take an Evidence parameter")]
[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 Load which does not take an Evidence parameter. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
public System.Reflection.Assembly Load (string assemblyString, System.Security.Policy.Evidence assemblySecurity);
abstract member Load : string * System.Security.Policy.Evidence -> System.Reflection.Assembly
override this.Load : string * System.Security.Policy.Evidence -> System.Reflection.Assembly
Public Function Load (assemblyString As String, assemblySecurity As Evidence) As Assembly
Parameters
assemblyString
String String String String

The display name of the assembly. See FullName.

assemblySecurity
Evidence Evidence Evidence Evidence

Evidence for loading the assembly.

Returns

The loaded assembly.

Implements
Exceptions

assemblyString is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and assemblyString was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

Remarks

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

For information that is common to all overloads of this method, see the Load(AssemblyName) method overload.

Security

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

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

WebPermission
for reading a path that is not in the form "file://" or "\\\UNC\dir\\" or "c:\\".

Load(Byte[], Byte[], Evidence) Load(Byte[], Byte[], Evidence) Load(Byte[], Byte[], Evidence) Load(Byte[], Byte[], Evidence)

Warning

This API is now obsolete.

Loads the Assembly with a common object file format (COFF) based image containing an emitted Assembly. The raw bytes representing the symbols for the Assembly are also loaded.

public:
 virtual System::Reflection::Assembly ^ Load(cli::array <System::Byte> ^ rawAssembly, cli::array <System::Byte> ^ rawSymbolStore, System::Security::Policy::Evidence ^ securityEvidence);
[System.Obsolete("Use an overload that does not take an Evidence parameter")]
[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 Load which does not take an Evidence parameter. See http://go.microsoft.com/fwlink/?LinkId=155570 for more information.")]
public System.Reflection.Assembly Load (byte[] rawAssembly, byte[] rawSymbolStore, System.Security.Policy.Evidence securityEvidence);
abstract member Load : byte[] * byte[] * System.Security.Policy.Evidence -> System.Reflection.Assembly
override this.Load : byte[] * byte[] * System.Security.Policy.Evidence -> System.Reflection.Assembly
Public Function Load (rawAssembly As Byte(), rawSymbolStore As Byte(), securityEvidence As Evidence) As Assembly
Parameters
rawAssembly
Byte[]

An array of type byte that is a COFF-based image containing an emitted assembly.

rawSymbolStore
Byte[]

An array of type byte containing the raw bytes representing the symbols for the assembly.

securityEvidence
Evidence Evidence Evidence Evidence

Evidence for loading the assembly.

Returns

The loaded assembly.

Implements
Exceptions

rawAssembly is not a valid assembly.

-or-

Version 2.0 or later of the common language runtime is currently loaded and rawAssembly was compiled with a later version.

An assembly or module was loaded twice with two different evidences.

securityEvidence is not null. When legacy CAS policy is not enabled, securityEvidence should be null.

Examples

The following sample demonstrates the use of loading a raw assembly.

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

}


// Loads the content of a file to a Byte array.
array<Byte>^ loadFile( String^ filename )
{
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   array<Byte>^buffer = gcnew array<Byte>((int)fs->Length);
   fs->Read( buffer, 0, buffer->Length );
   fs->Close();
   return buffer;
}


// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
void EmitAssembly( AppDomain^ domain )
{
   AssemblyName^ assemblyName = gcnew AssemblyName;
   assemblyName->Name = "MyAssembly";
   AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Save );
   ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyModule", "temp.dll", true );
   TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyType", TypeAttributes::Public );
   ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
   ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
   ilGenerator->EmitWriteLine( "MyType instantiated!" );
   ilGenerator->Emit( OpCodes::Ret );
   typeBuilder->CreateType();
   assemblyBuilder->Save( "temp.dll" );
}

ref class Resolver
{
public:
   static Assembly^ MyResolver( Object^ sender, ResolveEventArgs^ args )
   {
      AppDomain^ domain = dynamic_cast<AppDomain^>(sender);
      
      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly( domain );
      array<Byte>^rawAssembly = loadFile( "temp.dll" );
      array<Byte>^rawSymbolStore = loadFile( "temp.pdb" );
      Assembly^ assembly = domain->Load( rawAssembly, rawSymbolStore );
      return assembly;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   InstantiateMyType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Resolver::MyResolver );
   InstantiateMyType( currentDomain ); // OK!
}

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

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;
      
      InstantiateMyType(currentDomain);   // Failed!

      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);
      
      InstantiateMyType(currentDomain);   // OK!
   }
   
   static void InstantiateMyType(AppDomain domain) {
      try {
	 // You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }
   
   // Loads the content of a file to a byte array. 
   static byte[] loadFile(string filename) {
      FileStream fs = new FileStream(filename, FileMode.Open);
      byte[] buffer = new byte[(int) fs.Length];
      fs.Read(buffer, 0, buffer.Length);
      fs.Close();
   
      return buffer;
   }   

   static Assembly MyResolver(object sender, ResolveEventArgs args) {
      AppDomain domain = (AppDomain) sender;

      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly(domain);
      
      byte[] rawAssembly = loadFile("temp.dll");
      byte[] rawSymbolStore = loadFile("temp.pdb");
      Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);

      return assembly;
   }
   
   // Creates a dynamic assembly with symbol information
   // and saves them to temp.dll and temp.pdb
   static void EmitAssembly(AppDomain domain) {
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true);
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public);

      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      ilGenerator.EmitWriteLine("MyType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();
      
      assemblyBuilder.Save("temp.dll");
   }
}
Imports System
Imports System.IO
Imports System.Reflection
Imports System.Reflection.Emit

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyType(currentDomain)      ' Failed!

      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolver
      
      InstantiateMyType(currentDomain)      ' OK!
   End Sub 'Main
   
   
   Sub InstantiateMyType(domain As AppDomain)
      Try
	 ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub 'InstantiateMyType
   
   
   ' Loads the content of a file to a byte array. 
   Function loadFile(filename As String) As Byte()
      Dim fs As New FileStream(filename, FileMode.Open)
      Dim buffer(CInt(fs.Length)) As Byte
      fs.Read(buffer, 0, buffer.Length)
      fs.Close()
      
      Return buffer
   End Function 'loadFile
   
   
   Function MyResolver(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Dim domain As AppDomain = DirectCast(sender, AppDomain)
      
      ' Once the files are generated, this call is
      ' actually no longer necessary.
      EmitAssembly(domain)
      
      Dim rawAssembly As Byte() = loadFile("temp.dll")
      Dim rawSymbolStore As Byte() = loadFile("temp.pdb")
      Dim myAssembly As System.Reflection.Assembly = domain.Load(rawAssembly, rawSymbolStore)
      
      Return myAssembly
   End Function 'MyResolver
   
   
   ' Creates a dynamic assembly with symbol information
   ' and saves them to temp.dll and temp.pdb
   Sub EmitAssembly(domain As AppDomain)
      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", True)
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)
      
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      ilGenerator.EmitWriteLine("MyType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      assemblyBuilder.Save("temp.dll")
   End Sub 'EmitAssembly

End Module 'Test

Remarks

Beginning with the .NET Framework 4, the trust level of an assembly that is loaded by using this method is the same as the trust level of the application domain.

This method should be used only to load an assembly into the current application domain. This method is provided as a convenience for interoperability callers who cannot call the static Assembly.Load method. To load assemblies into other application domains, use a method such as CreateInstanceAndUnwrap.

For information that is common to all overloads of this method, see the Load(AssemblyName) method overload.

Security

SecurityPermission
to provide evidence. Associated enumeration: ControlEvidence. Security action: Demand.

FileIOPermission
for access to read from a file or directory, and for access to the information in the path itself. Associated enumerations: Read, PathDiscovery.

WebPermission
for reading a path that is not in the form "file://" or "\\\UNC\dir\\" or "c:\\".

Applies to