CustomAttributeBuilder CustomAttributeBuilder CustomAttributeBuilder CustomAttributeBuilder Class

定义

帮助生成自定义特性。Helps build custom attributes.

public ref class CustomAttributeBuilder : System::Runtime::InteropServices::_CustomAttributeBuilder
[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]
[System.Runtime.InteropServices.ComVisible(true)]
public class CustomAttributeBuilder : System.Runtime.InteropServices._CustomAttributeBuilder
type CustomAttributeBuilder = class
    interface _CustomAttributeBuilder
Public Class CustomAttributeBuilder
Implements _CustomAttributeBuilder
继承
CustomAttributeBuilderCustomAttributeBuilderCustomAttributeBuilderCustomAttributeBuilder
属性
实现

示例

下面的代码示例演示如何使用CustomAttributeBuilderThe following code sample illustrates the use of CustomAttributeBuilder.

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

// We will apply this custom attribute to our dynamic type.
public ref class ClassCreator: public Attribute
{
private:
   String^ creator;

public:

   property String^ Creator 
   {
      String^ get()
      {
         return creator;
      }

   }
   ClassCreator( String^ name )
   {
      this->creator = name;
   }

};


// We will apply this dynamic attribute to our dynamic method.
public ref class DateLastUpdated: public Attribute
{
private:
   String^ dateUpdated;

public:

   property String^ DateUpdated 
   {
      String^ get()
      {
         return dateUpdated;
      }

   }
   DateLastUpdated( String^ theDate )
   {
      this->dateUpdated = theDate;
   }

};

Type^ BuildTypeWithCustomAttributesOnMethod()
{
   AppDomain^ currentDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyAssembly";
   AssemblyBuilder^ myAsmBuilder = currentDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ myModBuilder = myAsmBuilder->DefineDynamicModule( "MyModule" );
   
   // First, we'll build a type with a custom attribute attached.
   TypeBuilder^ myTypeBuilder = myModBuilder->DefineType( "MyType", TypeAttributes::Public );
   array<Type^>^temp6 = {String::typeid};
   array<Type^>^ctorParams = temp6;
   ConstructorInfo^ classCtorInfo = ClassCreator::typeid->GetConstructor( ctorParams );
   array<Object^>^temp0 = {"Joe Programmer"};
   CustomAttributeBuilder^ myCABuilder = gcnew CustomAttributeBuilder( classCtorInfo,temp0 );
   myTypeBuilder->SetCustomAttribute( myCABuilder );
   
   // Now, let's build a method and add a custom attribute to it.
   array<Type^>^temp1 = gcnew array<Type^>(0);
   MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "HelloWorld", MethodAttributes::Public, nullptr, temp1 );
   array<Type^>^temp7 = {String::typeid};
   ctorParams = temp7;
   classCtorInfo = DateLastUpdated::typeid->GetConstructor( ctorParams );
   array<Object^>^temp2 = {DateTime::Now.ToString()};
   CustomAttributeBuilder^ myCABuilder2 = gcnew CustomAttributeBuilder( classCtorInfo,temp2 );
   myMethodBuilder->SetCustomAttribute( myCABuilder2 );
   ILGenerator^ myIL = myMethodBuilder->GetILGenerator();
   myIL->EmitWriteLine( "Hello, world!" );
   myIL->Emit( OpCodes::Ret );
   return myTypeBuilder->CreateType();
}

int main()
{
   Type^ myType = BuildTypeWithCustomAttributesOnMethod();
   Object^ myInstance = Activator::CreateInstance( myType );
   array<Object^>^customAttrs = myType->GetCustomAttributes( true );
   Console::WriteLine( "Custom Attributes for Type 'MyType':" );
   Object^ attrVal = nullptr;
   System::Collections::IEnumerator^ myEnum = customAttrs->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ customAttr = safe_cast<Object^>(myEnum->Current);
      array<Object^>^temp3 = gcnew array<Object^>(0);
      attrVal = ClassCreator::typeid->InvokeMember( "Creator", BindingFlags::GetProperty, nullptr, customAttr, temp3 );
      Console::WriteLine( "-- Attribute: [{0} = \"{1}\"]", customAttr, attrVal );
   }

   Console::WriteLine( "Custom Attributes for Method 'HelloWorld()' in 'MyType':" );
   customAttrs = myType->GetMember( "HelloWorld" )[ 0 ]->GetCustomAttributes( true );
   System::Collections::IEnumerator^ myEnum2 = customAttrs->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      Object^ customAttr = safe_cast<Object^>(myEnum2->Current);
      array<Object^>^temp4 = gcnew array<Object^>(0);
      attrVal = DateLastUpdated::typeid->InvokeMember( "DateUpdated", BindingFlags::GetProperty, nullptr, customAttr, temp4 );
      Console::WriteLine( "-- Attribute: [{0} = \"{1}\"]", customAttr, attrVal );
   }

   Console::WriteLine( "---" );
   array<Object^>^temp5 = gcnew array<Object^>(0);
   Console::WriteLine( myType->InvokeMember( "HelloWorld", BindingFlags::InvokeMethod, nullptr, myInstance, temp5 ) );
}

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


// We will apply this custom attribute to our dynamic type.
public class ClassCreator: Attribute

{
   private string creator;
   public string Creator 
   {
	get
	{
	   return creator;
	}
   }	

   public ClassCreator(string name)
   {
      this.creator = name;
   }

}

// We will apply this dynamic attribute to our dynamic method.
public class DateLastUpdated: Attribute

{
   private string dateUpdated;
   public string DateUpdated
   {
   	get
	{
	   return dateUpdated;
	}
   }

   public DateLastUpdated(string theDate)
   {
	this.dateUpdated = theDate;
   } 

}

class MethodBuilderCustomAttributesDemo

{

   public static Type BuildTypeWithCustomAttributesOnMethod()
   {
	
	AppDomain currentDomain = Thread.GetDomain();
	
	AssemblyName myAsmName = new AssemblyName();
	myAsmName.Name = "MyAssembly";

	AssemblyBuilder myAsmBuilder = currentDomain.DefineDynamicAssembly(
				       myAsmName, AssemblyBuilderAccess.Run);

	ModuleBuilder myModBuilder = myAsmBuilder.DefineDynamicModule("MyModule");

	// First, we'll build a type with a custom attribute attached.

	TypeBuilder myTypeBuilder = myModBuilder.DefineType("MyType",
						TypeAttributes.Public);
	
	Type[] ctorParams = new Type[] { typeof(string) };
	ConstructorInfo classCtorInfo = typeof(ClassCreator).GetConstructor(ctorParams);

	CustomAttributeBuilder myCABuilder = new CustomAttributeBuilder(
						classCtorInfo,
						new object[] { "Joe Programmer" });

	myTypeBuilder.SetCustomAttribute(myCABuilder);

	// Now, let's build a method and add a custom attribute to it.

	MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("HelloWorld",
					MethodAttributes.Public,
					null,
					new Type[] { });

	ctorParams = new Type[] { typeof(string) };
	classCtorInfo = typeof(DateLastUpdated).GetConstructor(ctorParams);

	CustomAttributeBuilder myCABuilder2 = new CustomAttributeBuilder(
						classCtorInfo,
						new object[] { DateTime.Now.ToString() });

	myMethodBuilder.SetCustomAttribute(myCABuilder2);

	ILGenerator myIL = myMethodBuilder.GetILGenerator();

	myIL.EmitWriteLine("Hello, world!");
	myIL.Emit(OpCodes.Ret);

	return myTypeBuilder.CreateType();
	
   }

   public static void Main() 
   {

	Type myType = BuildTypeWithCustomAttributesOnMethod();

	object myInstance = Activator.CreateInstance(myType);

	object[] customAttrs = myType.GetCustomAttributes(true);

	Console.WriteLine("Custom Attributes for Type 'MyType':");

	object attrVal = null;

	foreach (object customAttr in customAttrs) 
   	{
	   attrVal = typeof(ClassCreator).InvokeMember("Creator", 
					  BindingFlags.GetProperty,
					  null, customAttr, new object[] { });
	   Console.WriteLine("-- Attribute: [{0} = \"{1}\"]", customAttr, attrVal);
        }

	Console.WriteLine("Custom Attributes for Method 'HelloWorld()' in 'MyType':");

	customAttrs = myType.GetMember("HelloWorld")[0].GetCustomAttributes(true);	

	foreach (object customAttr in customAttrs) 
   	{
	   attrVal = typeof(DateLastUpdated).InvokeMember("DateUpdated", 
					  BindingFlags.GetProperty,
					  null, customAttr, new object[] { });
	   Console.WriteLine("-- Attribute: [{0} = \"{1}\"]", customAttr, attrVal);
        }

	Console.WriteLine("---");

	Console.WriteLine(myType.InvokeMember("HelloWorld",
			  BindingFlags.InvokeMethod,
			  null, myInstance, new object[] { }));
						   
	
   }

}


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

 _


' We will apply this custom attribute to our dynamic type.
Public Class ClassCreator

   Inherits Attribute
   
   Private creator As String
   
   Public ReadOnly Property GetCreator() As String
      Get
         Return creator
      End Get
   End Property
   
   
   Public Sub New(name As String)
      Me.creator = name
   End Sub 'New

End Class 'ClassCreator
 _ 

' We will apply this dynamic attribute to our dynamic method.
Public Class DateLastUpdated

   Inherits Attribute
   
   Private dateUpdated As String
   
   Public ReadOnly Property GetDateUpdated() As String
      Get
         Return dateUpdated
      End Get
   End Property
   
   
   Public Sub New(theDate As String)
      Me.dateUpdated = theDate
   End Sub 'New

End Class 'DateLastUpdated
 _ 

Class MethodBuilderCustomAttributesDemo
   
   Public Shared Function BuildTypeWithCustomAttributesOnMethod() As Type
      
      Dim currentDomain As AppDomain = Thread.GetDomain()
      
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = currentDomain.DefineDynamicAssembly(myAsmName, _
							AssemblyBuilderAccess.Run)
      
      Dim myModBuilder As ModuleBuilder = myAsmBuilder.DefineDynamicModule("MyModule")
      
      ' First, we'll build a type with a custom attribute attached.
      Dim myTypeBuilder As TypeBuilder = myModBuilder.DefineType("MyType", _
							TypeAttributes.Public)
      
      Dim ctorParams() As Type = {GetType(String)}
      Dim classCtorInfo As ConstructorInfo = GetType(ClassCreator).GetConstructor(ctorParams)
      
      Dim myCABuilder As New CustomAttributeBuilder(classCtorInfo, _
						New Object() {"Joe Programmer"})
      
      myTypeBuilder.SetCustomAttribute(myCABuilder)
      
      ' Now, let's build a method and add a custom attribute to it.
      Dim myMethodBuilder As MethodBuilder = myTypeBuilder.DefineMethod("HelloWorld", _
					MethodAttributes.Public, Nothing, New Type() {})
      
      ctorParams = New Type() {GetType(String)}
      classCtorInfo = GetType(DateLastUpdated).GetConstructor(ctorParams)
      
      Dim myCABuilder2 As New CustomAttributeBuilder(classCtorInfo, _
						New Object() {DateTime.Now.ToString()})
      
      myMethodBuilder.SetCustomAttribute(myCABuilder2)
      
      Dim myIL As ILGenerator = myMethodBuilder.GetILGenerator()
      
      myIL.EmitWriteLine("Hello, world!")
      myIL.Emit(OpCodes.Ret)
      
      Return myTypeBuilder.CreateType()

   End Function 'BuildTypeWithCustomAttributesOnMethod
    
   
   Public Shared Sub Main()
      
      Dim myType As Type = BuildTypeWithCustomAttributesOnMethod()
      
      Dim myInstance As Object = Activator.CreateInstance(myType)
      
      Dim customAttrs As Object() = myType.GetCustomAttributes(True)
      
      Console.WriteLine("Custom Attributes for Type 'MyType':")
      
      Dim attrVal As Object = Nothing
      
      Dim customAttr As Object
      For Each customAttr In  customAttrs
         attrVal = GetType(ClassCreator).InvokeMember("GetCreator", _
						BindingFlags.GetProperty, _
						Nothing, customAttr, New Object() {})
         Console.WriteLine("-- Attribute: [{0} = ""{1}""]", customAttr, attrVal)
      Next customAttr
      
      Console.WriteLine("Custom Attributes for Method 'HelloWorld()' in 'MyType':")
      
      customAttrs = myType.GetMember("HelloWorld")(0).GetCustomAttributes(True)
      
      For Each customAttr In  customAttrs
         attrVal = GetType(DateLastUpdated).InvokeMember("GetDateUpdated", _
						BindingFlags.GetProperty, _
						Nothing, customAttr, New Object() {})
         Console.WriteLine("-- Attribute: [{0} = ""{1}""]", customAttr, attrVal)
      Next customAttr
      
      Console.WriteLine("---")
      
      Console.WriteLine(myType.InvokeMember("HelloWorld", BindingFlags.InvokeMethod, _
						Nothing, myInstance, New Object() {}))
   End Sub 'Main

End Class 'MethodBuilderCustomAttributesDemo

注解

使用CustomAttributeBuilder来描述自定义特性的构造函数所返回对象。Use the CustomAttributeBuilder object returned by the constructor to describe the custom attribute. 将相关联CustomAttribute与生成器实例通过调用SetCustomAttribute该生成器实例上的方法。Associate the CustomAttribute with a builder instance by calling the SetCustomAttribute method on that builder instance. 例如,创建CustomAttributeBuilder来描述的实例AssemblyCultureAttribute通过提供的构造函数AssemblyCultureAttribute及其参数。For example, create a CustomAttributeBuilder to describe an instance of AssemblyCultureAttribute by supplying the constructor of AssemblyCultureAttribute and its argument. 然后调用SetCustomAttributeAssemblyBuilder来建立关联。Then call SetCustomAttribute on an AssemblyBuilder to establish the association.

构造函数

CustomAttributeBuilder(ConstructorInfo, Object[]) CustomAttributeBuilder(ConstructorInfo, Object[]) CustomAttributeBuilder(ConstructorInfo, Object[]) CustomAttributeBuilder(ConstructorInfo, Object[])

在给定了自定义属性的构造函数和构造函数的参数的情况下,初始化 CustomAttributeBuilder 类的实例。Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute and the arguments to the constructor.

CustomAttributeBuilder(ConstructorInfo, Object[], FieldInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], FieldInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], FieldInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], FieldInfo[], Object[])

已知自定义特性的构造函数、该构造函数的参数以及一组命名的字段/值对,初始化 CustomAttributeBuilder 类的实例。Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute, the arguments to the constructor, and a set of named field/value pairs.

CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[])

已知自定义特性的构造函数、该构造函数的参数以及一组命名的属性/值对,初始化 CustomAttributeBuilder 类的实例。Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute, the arguments to the constructor, and a set of named property or value pairs.

CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[], FieldInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[], FieldInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[], FieldInfo[], Object[]) CustomAttributeBuilder(ConstructorInfo, Object[], PropertyInfo[], Object[], FieldInfo[], Object[])

已知自定义特性的构造函数、该构造函数的参数、一组命名的属性/值对以及一组命名的字段/值对,初始化 CustomAttributeBuilder 类的实例。Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute, the arguments to the constructor, a set of named property or value pairs, and a set of named field or value pairs.

显式界面实现

_CustomAttributeBuilder.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) _CustomAttributeBuilder.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) _CustomAttributeBuilder.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) _CustomAttributeBuilder.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

将一组名称映射为对应的一组调度标识符。Maps a set of names to a corresponding set of dispatch identifiers.

_CustomAttributeBuilder.GetTypeInfo(UInt32, UInt32, IntPtr) _CustomAttributeBuilder.GetTypeInfo(UInt32, UInt32, IntPtr) _CustomAttributeBuilder.GetTypeInfo(UInt32, UInt32, IntPtr) _CustomAttributeBuilder.GetTypeInfo(UInt32, UInt32, IntPtr)

检索对象的类型信息,然后可以使用该信息获取接口的类型信息。Retrieves the type information for an object, which can then be used to get the type information for an interface.

_CustomAttributeBuilder.GetTypeInfoCount(UInt32) _CustomAttributeBuilder.GetTypeInfoCount(UInt32) _CustomAttributeBuilder.GetTypeInfoCount(UInt32) _CustomAttributeBuilder.GetTypeInfoCount(UInt32)

检索对象提供的类型信息接口的数量(0 或 1)。Retrieves the number of type information interfaces that an object provides (either 0 or 1).

_CustomAttributeBuilder.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) _CustomAttributeBuilder.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) _CustomAttributeBuilder.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) _CustomAttributeBuilder.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

提供对某一对象公开的属性和方法的访问。Provides access to properties and methods exposed by an object.

方法

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

获取当前实例的 TypeGets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(Inherited from Object)

适用于