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MethodBuilder::SetSymCustomAttribute Method

Set a symbolic custom attribute using a blob.

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

void SetSymCustomAttribute(
	String^ name, 
	array<unsigned char>^ data


Type: System::String

The name of the symbolic custom attribute.

Type: array<System::Byte>

The byte blob that represents the value of the symbolic custom attribute.


The containing type was previously created using CreateType.


The module that contains this method is not a debug module.


For the current method, the IsGenericMethod property is true, but the IsGenericMethodDefinition property is false.

Unlike the metadata custom attribute, this custom attribute is associated with a symbol writer.

The code sample below illustrates the contextual usage of the SetSymCustomAttribute method to set the byte values for the name and key of a custom attribute attached to a method.

array<Type^>^ temp0 = { String::typeid };
MethodBuilder^ myMethod = myDynamicType->DefineMethod( "MyMethod",
                          temp0 );

// A 128-bit key in hex form, represented as a Byte array. 
array<Byte>^ keyVal = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                        0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xFF, 0xFF};

System::Text::ASCIIEncoding^ encoder = gcnew System::Text::ASCIIEncoding;
array<Byte>^ symFullName = encoder->GetBytes( "My Dynamic Method" );

myMethod->SetSymCustomAttribute( "SymID", keyVal );
myMethod->SetSymCustomAttribute( "SymFullName", symFullName );

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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