ConstructorBuilder.SetCustomAttribute 方法

定義

命名空間:

System.Reflection.Emit

組件:

System.Reflection.Emit.dll

設定自訂屬性。

多載

SetCustomAttribute(CustomAttributeBuilder)	使用自訂屬性產生器來設定自訂屬性。
SetCustomAttribute(ConstructorInfo, Byte[])	使用指定的自訂屬性 Blob 來設定自訂屬性。

SetCustomAttribute(CustomAttributeBuilder)

來源:

ConstructorBuilder.cs

使用自訂屬性產生器來設定自訂屬性。

public:
 void SetCustomAttribute(System::Reflection::Emit::CustomAttributeBuilder ^ customBuilder);

public void SetCustomAttribute (System.Reflection.Emit.CustomAttributeBuilder customBuilder);

member this.SetCustomAttribute : System.Reflection.Emit.CustomAttributeBuilder -> unit

Public Sub SetCustomAttribute (customBuilder As CustomAttributeBuilder)

參數

customBuilder

CustomAttributeBuilder

定義自訂屬性的協助程式類別執行個體。

例外狀況

ArgumentNullException

customBuilder 為 null。

範例

下列程式代碼範例說明 如何使用 SetCustomAttributeConstructorBuilder的內容，傳遞 CustomAttributeBuilder。

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

[AttributeUsage(AttributeTargets::All,AllowMultiple=false)]
public ref class MyAttribute: public Attribute
{
public:
   String^ myString;
   int myInteger;
   MyAttribute( String^ myString, int myInteger )
   {
      this->myString = myString;
      this->myInteger = myInteger;
   }

};

static Type^ MyCreateCallee( AppDomain^ domain )
{
   AssemblyName^ myAssemblyName = gcnew AssemblyName;
   myAssemblyName->Name = "EmittedAssembly";

   // Define a dynamic assembly in the current application domain->
   AssemblyBuilder^ myAssembly = domain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::Run );

   // Define a dynamic module in this assembly->
   ModuleBuilder^ myModuleBuilder = myAssembly->DefineDynamicModule( "EmittedModule" );

   // Construct a 'TypeBuilder' given the name and attributes.
   TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "HelloWorld", TypeAttributes::Public );

   // Define a constructor of the dynamic class.
   array<Type^>^type1 = {String::typeid};
   ConstructorBuilder^ myConstructor = myTypeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, type1 );
   ILGenerator^ myILGenerator = myConstructor->GetILGenerator();
   myILGenerator->Emit( OpCodes::Ldstr, "Constructor is invoked" );
   myILGenerator->Emit( OpCodes::Ldarg_1 );
   array<Type^>^type2 = {String::typeid};
   MethodInfo^ myMethodInfo = Console::typeid->GetMethod( "WriteLine", type2 );
   myILGenerator->Emit( OpCodes::Call, myMethodInfo );
   myILGenerator->Emit( OpCodes::Ret );
   Type^ myType = MyAttribute::typeid;
   array<Type^>^type3 = {String::typeid,int::typeid};
   ConstructorInfo^ myConstructorInfo = myType->GetConstructor( type3 );
   array<Object^>^obj1 = {"Hello",2};
   CustomAttributeBuilder^ attributeBuilder = gcnew CustomAttributeBuilder( myConstructorInfo,obj1 );
   try
   {
      myConstructor->SetCustomAttribute( attributeBuilder );
   }
   catch ( ArgumentNullException^ ex ) 
   {
      Console::WriteLine( "The following exception has occurred : {0}", ex->Message );
   }
   catch ( Exception^ ex ) 
   {
      Console::WriteLine( "The following exception has occurred : {0}", ex->Message );
   }

   return myTypeBuilder->CreateType();
}

int main()
{
   Type^ myHelloworld = MyCreateCallee( Thread::GetDomain() );
   array<Type^>^type1 = {String::typeid};
   ConstructorInfo^ myConstructor = myHelloworld->GetConstructor( type1 );
   array<Object^>^myAttributes1 = myConstructor->GetCustomAttributes( true );
   Console::WriteLine( "MyAttribute custom attribute contains  " );
   for ( int index = 0; index < myAttributes1->Length; index++ )
   {
      if ( dynamic_cast<MyAttribute^>(myAttributes1[ index ]) )
      {
         Console::WriteLine( "The value of myString is : {0}", (safe_cast<MyAttribute^>(myAttributes1[ index ]))->myString );
         Console::WriteLine( "The value of myInteger is : {0}", (safe_cast<MyAttribute^>(myAttributes1[ index ]))->myInteger );
      }
   }
}

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

[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute : Attribute
{
   public String myString;
   public int myInteger;
   public MyAttribute(String myString, int myInteger)
   {
      this.myString = myString;
      this.myInteger = myInteger;
   }
}

public class MyConstructorBuilder
{
   public static void Main()
   {
      Type myHelloworld = MyCreateCallee(Thread.GetDomain());
      ConstructorInfo myConstructor = myHelloworld.GetConstructor(new Type[]{typeof(String)});
      object[] myAttributes1 = myConstructor.GetCustomAttributes(true);
      Console.WriteLine("MyAttribute custom attribute contains  ");
      for(int index=0; index < myAttributes1.Length; index++)
      {
         if(myAttributes1[index] is MyAttribute)
         {
            Console.WriteLine("The value of myString is : "
                                       + ((MyAttribute)myAttributes1[index]).myString);
            Console.WriteLine("The value of myInteger is : "
                                       + ((MyAttribute)myAttributes1[index]).myInteger);
         }
      }
   }

   private static Type MyCreateCallee(AppDomain domain)
   {
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "EmittedAssembly";
      // Define a dynamic assembly in the current application domain.
      AssemblyBuilder myAssembly =
                  domain.DefineDynamicAssembly(myAssemblyName,AssemblyBuilderAccess.Run);
      // Define a dynamic module in this assembly.
      ModuleBuilder myModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule");
       // Construct a 'TypeBuilder' given the name and attributes.
      TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("HelloWorld",
         TypeAttributes.Public);
      // Define a constructor of the dynamic class.
      ConstructorBuilder myConstructor = myTypeBuilder.DefineConstructor(
               MethodAttributes.Public, CallingConventions.Standard, new Type[]{typeof(String)});
      ILGenerator myILGenerator = myConstructor.GetILGenerator();
      myILGenerator.Emit(OpCodes.Ldstr, "Constructor is invoked");
      myILGenerator.Emit(OpCodes.Ldarg_1);
      MethodInfo myMethodInfo =
                     typeof(Console).GetMethod("WriteLine",new Type[]{typeof(string)});
      myILGenerator.Emit(OpCodes.Call, myMethodInfo);
      myILGenerator.Emit(OpCodes.Ret);
      Type myType = typeof(MyAttribute);
      ConstructorInfo myConstructorInfo = myType.GetConstructor(new Type[2]{typeof(String), typeof(int)});
      CustomAttributeBuilder attributeBuilder =
         new CustomAttributeBuilder(myConstructorInfo, new object[2]{"Hello", 2});
      try
      {
         myConstructor.SetCustomAttribute(attributeBuilder);
      }
      catch(ArgumentNullException ex)
      {
         Console.WriteLine("The following exception has occurred : "+ex.Message);
      }
      catch(Exception ex)
      {
         Console.WriteLine("The following exception has occurred : "+ex.Message);
      }
      return myTypeBuilder.CreateType();
   }
}

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


<AttributeUsage(AttributeTargets.All, AllowMultiple := False)>  _
Public Class MyAttribute
   Inherits Attribute
   Public myString As String
   Public myInteger As Integer
   
   Public Sub New(myString As String, myInteger As Integer)
      Me.myString = myString
      Me.myInteger = myInteger
   End Sub
End Class

Public Class MyConstructorBuilder
   
   Public Shared Sub Main()
      Dim myHelloworld As Type = MyCreateCallee(Thread.GetDomain())
      Dim myConstructor As ConstructorInfo = myHelloworld.GetConstructor(New Type() _ 
                                                                       {GetType(String)})
      Dim myAttributes1 As Object() = myConstructor.GetCustomAttributes(True)
      Console.WriteLine("MyAttribute custom attribute contains  ")
      Dim index As Integer
      For index = 0 To myAttributes1.Length - 1
         If TypeOf myAttributes1(index) Is MyAttribute Then
            Console.WriteLine("The value of myString is : " + CType(myAttributes1(index), _ 
                                                                       MyAttribute).myString)
            Console.WriteLine("The value of myInteger is : " + CType(myAttributes1(index), _ 
                                                            MyAttribute).myInteger.ToString())
         End If
      Next index
   End Sub
   
   Private Shared Function MyCreateCallee(domain As AppDomain) As Type
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "EmittedAssembly"
      ' Define a dynamic assembly in the current application domain.
      Dim myAssembly As AssemblyBuilder = domain.DefineDynamicAssembly _ 
                                          (myAssemblyName, AssemblyBuilderAccess.Run)
      ' Define a dynamic module in this assembly.
      Dim myModuleBuilder As ModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule")
      ' Construct a 'TypeBuilder' given the name and attributes.
      Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType _ 
                                                       ("HelloWorld", TypeAttributes.Public)
      ' Define a constructor of the dynamic class.
      Dim myConstructor As ConstructorBuilder = myTypeBuilder.DefineConstructor _ 
             (MethodAttributes.Public, CallingConventions.Standard, New Type() {GetType(String)})
      Dim myILGenerator As ILGenerator = myConstructor.GetILGenerator()
      myILGenerator.Emit(OpCodes.Ldstr, "Constructor is invoked")
      myILGenerator.Emit(OpCodes.Ldarg_1)
      Dim myMethodInfo As MethodInfo = GetType(Console).GetMethod("WriteLine", New Type() _ 
                                                                           {GetType(String)})
      myILGenerator.Emit(OpCodes.Call, myMethodInfo)
      myILGenerator.Emit(OpCodes.Ret)
      Dim myType As Type = GetType(MyAttribute)
      Dim myConstructorInfo As ConstructorInfo = myType.GetConstructor(New Type(1) _ 
                                                           {GetType(String), GetType(Integer)})
      Dim attributeBuilder As New CustomAttributeBuilder _ 
                                  (myConstructorInfo, New Object(1) {"Hello", 2})
      Try
         myConstructor.SetCustomAttribute(attributeBuilder)
      Catch ex As ArgumentNullException
         Console.WriteLine("The following exception has occurred : " + ex.Message)
      Catch ex As Exception
         Console.WriteLine("The following exception has occurred : " + ex.Message)
      End Try
      Return myTypeBuilder.CreateType()
   End Function 'MyCreateCallee
End Class

SetCustomAttribute(ConstructorInfo, Byte[])

來源:

ConstructorBuilder.cs

使用指定的自訂屬性 Blob 來設定自訂屬性。

public:
 void SetCustomAttribute(System::Reflection::ConstructorInfo ^ con, cli::array <System::Byte> ^ binaryAttribute);

public void SetCustomAttribute (System.Reflection.ConstructorInfo con, byte[] binaryAttribute);

member this.SetCustomAttribute : System.Reflection.ConstructorInfo * byte[] -> unit

Public Sub SetCustomAttribute (con As ConstructorInfo, binaryAttribute As Byte())

參數

con

ConstructorInfo

自訂屬性的建構函式。

binaryAttribute

Byte[]

代表屬性的位元組 Blob。

例外狀況

ArgumentNullException

con 或 binaryAttribute 為 null。

範例

下列程式代碼範例說明如何使用 SetCustomAttributeConstructorBuilder，傳遞位元組 Blob。

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

[AttributeUsage(AttributeTargets::All,AllowMultiple=false)]
public ref class MyAttribute: public Attribute
{
public:
   bool myBoolean;
   MyAttribute( bool myBoolean )
   {
      this->myBoolean = myBoolean;
   }
};

static Type^ MyCreateCallee( AppDomain^ domain )
{
   AssemblyName^ myAssemblyName = gcnew AssemblyName;
   myAssemblyName->Name = "EmittedAssembly";
   
   // Define a dynamic assembly in the current application domain.
   AssemblyBuilder^ myAssembly = domain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::Run );
   
   // Define a dynamic module in this assembly.
   ModuleBuilder^ myModuleBuilder = myAssembly->DefineDynamicModule( "EmittedModule" );
   
   // Construct a 'TypeBuilder' given the name and attributes.
   TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "HelloWorld", TypeAttributes::Public );
   
   // Define a constructor of the dynamic class.
   array<Type^>^type1 = {String::typeid};
   ConstructorBuilder^ myConstructor = myTypeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, type1 );
   ILGenerator^ myILGenerator = myConstructor->GetILGenerator();
   myILGenerator->Emit( OpCodes::Ldstr, "Constructor is invoked" );
   myILGenerator->Emit( OpCodes::Ldarg_1 );
   array<Type^>^type2 = {String::typeid};
   MethodInfo^ myMethodInfo = Console::typeid->GetMethod( "WriteLine", type2 );
   myILGenerator->Emit( OpCodes::Call, myMethodInfo );
   myILGenerator->Emit( OpCodes::Ret );
   Type^ myType = MyAttribute::typeid;
   array<Type^>^type3 = {bool::typeid};
   ConstructorInfo^ myConstructorInfo = myType->GetConstructor( type3 );
   try
   {
      array<Byte>^bytes = {01,00,01};
      myConstructor->SetCustomAttribute( myConstructorInfo, bytes );
   }
   catch ( ArgumentNullException^ ex ) 
   {
      Console::WriteLine( "The following exception has occurred : {0}", ex->Message );
   }
   catch ( Exception^ ex ) 
   {
      Console::WriteLine( "The following exception has occurred : {0}", ex->Message );
   }

   return myTypeBuilder->CreateType();
}

int main()
{
   Type^ myHelloworld = MyCreateCallee( Thread::GetDomain() );
   array<Type^>^type1 = {String::typeid};
   ConstructorInfo^ myConstructor = myHelloworld->GetConstructor( type1 );
   array<Object^>^myAttributes1 = myConstructor->GetCustomAttributes( true );
   Console::WriteLine( "MyAttribute custom attribute contains  " );
   for ( int index = 0; index < myAttributes1->Length; index++ )
   {
      if ( dynamic_cast<MyAttribute^>(myAttributes1[ index ]) )
      {
         Console::WriteLine( "myBoolean : {0}", safe_cast<MyAttribute^>(myAttributes1[ index ])->myBoolean );
      }
   }
}

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

[AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
public class MyAttribute : Attribute
{
   public bool myBoolean;

   public MyAttribute(bool myBoolean)
   {
      this.myBoolean = myBoolean;
   }
}

public class MyConstructorBuilder
{
   public static void Main()
   {
      Type myHelloworld = MyCreateCallee(Thread.GetDomain());
      ConstructorInfo myConstructor = myHelloworld.GetConstructor(new Type[]{typeof(String)});
      object[] myAttributes1 = myConstructor.GetCustomAttributes(true);
      Console.WriteLine("MyAttribute custom attribute contains  ");
      for(int index=0; index < myAttributes1.Length; index++)
      {
         if(myAttributes1[index] is MyAttribute)
         {
            Console.WriteLine("myBoolean : " + ((MyAttribute)myAttributes1[index]).myBoolean);
         }
      }
   }

   private static Type MyCreateCallee(AppDomain domain)
   {
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "EmittedAssembly";
      // Define a dynamic assembly in the current application domain.
      AssemblyBuilder myAssembly =
                  domain.DefineDynamicAssembly(myAssemblyName,AssemblyBuilderAccess.Run);
      // Define a dynamic module in this assembly.
      ModuleBuilder myModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule");
      // Construct a 'TypeBuilder' given the name and attributes.
      TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("HelloWorld",
         TypeAttributes.Public);
      // Define a constructor of the dynamic class.
      ConstructorBuilder myConstructor = myTypeBuilder.DefineConstructor(
               MethodAttributes.Public, CallingConventions.Standard, new Type[]{typeof(String)});
      ILGenerator myILGenerator = myConstructor.GetILGenerator();
      myILGenerator.Emit(OpCodes.Ldstr, "Constructor is invoked");
      myILGenerator.Emit(OpCodes.Ldarg_1);
      MethodInfo myMethodInfo =
                     typeof(Console).GetMethod("WriteLine",new Type[]{typeof(string)});
      myILGenerator.Emit(OpCodes.Call, myMethodInfo);
      myILGenerator.Emit(OpCodes.Ret);
      Type myType = typeof(MyAttribute);
      ConstructorInfo myConstructorInfo = myType.GetConstructor(new Type[]{typeof(bool)});
      try
      {
         myConstructor.SetCustomAttribute(myConstructorInfo, new byte[]{01,00,01});
      }
      catch(ArgumentNullException ex)
      {
         Console.WriteLine("The following exception has occurred : "+ex.Message);
      }
      catch(Exception ex)
      {
         Console.WriteLine("The following exception has occurred : "+ex.Message);
      }
      return myTypeBuilder.CreateType();
   }
}

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

<AttributeUsage(AttributeTargets.All, AllowMultiple := False)>  _
Public Class MyAttribute
   Inherits Attribute
   Public myBoolean As Boolean

   Public Sub New(myBoolean As Boolean)
      Me.myBoolean = myBoolean
   End Sub
End Class

Public Class MyConstructorBuilder

   Public Shared Sub Main()
      Dim myHelloworld As Type = MyCreateCallee(Thread.GetDomain())
      Dim myConstructor As ConstructorInfo = myHelloworld.GetConstructor(New Type() _
                                                                        {GetType(String)})
      Dim myAttributes1 As Object() = myConstructor.GetCustomAttributes(True)
      Console.WriteLine("MyAttribute custom attribute contains  ")
      Dim index As Integer
      For index = 0 To myAttributes1.Length - 1
         If TypeOf myAttributes1(index) Is MyAttribute Then
            Console.WriteLine("myBoolean : " + _
                               CType(myAttributes1(index), MyAttribute).myBoolean.ToString())
         End If
      Next index
   End Sub

   Private Shared Function MyCreateCallee(domain As AppDomain) As Type
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "EmittedAssembly"
      ' Define a dynamic assembly in the current application domain.
      Dim myAssembly As AssemblyBuilder = domain.DefineDynamicAssembly _
                                       (myAssemblyName, AssemblyBuilderAccess.Run)
      ' Define a dynamic module in this assembly.
      Dim myModuleBuilder As ModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule")
      ' Construct a 'TypeBuilder' given the name and attributes.
      Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType _
                                                       ("HelloWorld", TypeAttributes.Public)
      ' Define a constructor of the dynamic class.
      Dim myConstructor As ConstructorBuilder = myTypeBuilder.DefineConstructor _
                (MethodAttributes.Public, CallingConventions.Standard, New Type() {GetType(String)})
      Dim myILGenerator As ILGenerator = myConstructor.GetILGenerator()
      myILGenerator.Emit(OpCodes.Ldstr, "Constructor is invoked")
      myILGenerator.Emit(OpCodes.Ldarg_1)
      Dim myMethodInfo As MethodInfo = GetType(Console).GetMethod("WriteLine", New Type() _
                                                                          {GetType(String)})
      myILGenerator.Emit(OpCodes.Call, myMethodInfo)
      myILGenerator.Emit(OpCodes.Ret)
      Dim myType As Type = GetType(MyAttribute)
      Dim myConstructorInfo As ConstructorInfo = myType.GetConstructor(New Type() {GetType(Boolean)})
      Try
         myConstructor.SetCustomAttribute(myConstructorInfo, New Byte() {1, 0, 1})
      Catch ex As ArgumentNullException
         Console.WriteLine("The following exception has occurred : " + ex.Message)
      Catch ex As Exception
         Console.WriteLine("The following exception has occurred : " + ex.Message)
      End Try
      Return myTypeBuilder.CreateType()
   End Function 'MyCreateCallee
End Class

備註

如需如何格式化 binaryAttribute的詳細資訊，請參閱 Common Language Infrastructure (CLI) 規格之分割區 II 中的元數據規格。