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EnumBuilder::SetCustomAttribute Method (ConstructorInfo, array<Byte>)

Sets a custom attribute using a specified custom attribute blob.

Namespace:  System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

void SetCustomAttribute(
	ConstructorInfo^ con, 
	array<unsigned char>^ binaryAttribute


Type: System.Reflection::ConstructorInfo
The constructor for the custom attribute.
Type: array<System::Byte>
A byte blob representing the attributes.


con or binaryAttribute is nullptr.

See the metadata specification in the ECMA Partition II documentation for details on how to format binaryAttribute. The documentation is available online; see ECMA C# and Common Language Infrastructure Standards on MSDN and Standard ECMA-335 - Common Language Infrastructure (CLI) on the Ecma International Web site.

The following code sample illustrates the use of SetCustomAttribute in the context of EnumBuilder, passing a byte blob.

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

public ref class MyAttribute: public Attribute
   bool myBoolValue;
   MyAttribute( bool myBool )
      this->myBoolValue = myBool;

ref class MyApplication
   static EnumBuilder^ myEnumBuilder;

   static void Main()
         CreateCallee( Thread::GetDomain() );
         array<Object^>^myAttributesArray = myEnumBuilder->GetCustomAttributes( true );

         // Read the attributes and display them on the console.
         Console::WriteLine( "Custom attribute contains: " );
         for ( int index = 0; index < myAttributesArray->Length; index++ )
            if ( dynamic_cast<MyAttribute^>(myAttributesArray[ index ]) )
               Console::WriteLine( "myBoolValue: {0}", (dynamic_cast<MyAttribute^>(myAttributesArray[ index ]))->myBoolValue );
      catch ( Exception^ e ) 
         Console::WriteLine( "The following exception is raised:{0}", e->Message );


   static void CreateCallee( AppDomain^ domain )
      AssemblyName^ myAssemblyName = gcnew AssemblyName;

      // Create a name for the assembly.
      myAssemblyName->Name = "EmittedAssembly";

      // Create the dynamic assembly.
      AssemblyBuilder^ myAssemblyBuilder = domain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::Run );
      Type^ myType = MyAttribute::typeid;
      array<Type^>^temp0 = {bool::typeid};
      ConstructorInfo^ myInfo = myType->GetConstructor( temp0 );

      // Create a dynamic module.
      ModuleBuilder^ myModuleBuilder = myAssemblyBuilder->DefineDynamicModule( "EmittedModule" );

      // Create a dynamic Enum.
      myEnumBuilder = myModuleBuilder->DefineEnum( "MyNamespace.MyEnum", TypeAttributes::Public, Int32::typeid );
      FieldBuilder^ myFieldBuilder1 = myEnumBuilder->DefineLiteral( "FieldOne", 1 );
      FieldBuilder^ myFieldBuilder2 = myEnumBuilder->DefineLiteral( "FieldTwo", 2 );
      array<Byte>^temp1 = {01,00,01};
      myEnumBuilder->SetCustomAttribute( myInfo, temp1 );

int main()

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.