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MethodBuilder.SetImplementationFlags Method

Sets the implementation flags for this method.

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

Public Sub SetImplementationFlags ( _
	attributes As MethodImplAttributes _


Type: System.Reflection.MethodImplAttributes

The implementation flags to set.


The containing type was previously created using CreateType.


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

When you use the SetImplementationFlags method in combination with the SetCustomAttribute method, be aware of potential interactions. For example, using the SetCustomAttribute method to add the DllImportAttribute attribute also sets the MethodImplAttributes.PreserveSig flag. If you subsequently call the SetImplementationFlags method, the PreserveSig flag is overwritten. There are two ways to avoid this:

  • Call the SetImplementationFlags method before you call the SetCustomAttribute method. The SetCustomAttribute method always respects existing method implementation flags.

  • When you set implementation flags, call the GetMethodImplementationFlags method to retrieve the existing flags, use bitwise OR to add your flag, and then call the SetImplementationFlags method.

The code sample below illustrates the contextual use of the SetImplementationFlags method to describe the implementation of MSIL in a method body.

      Dim myMthdBuilder As MethodBuilder = myTypeBuilder.DefineMethod("MyMethod", _
					   MethodAttributes.Public, _
					   CallingConventions.HasThis, _
					   GetType(Integer), _
					   New Type() {GetType(Integer), GetType(Integer)})

      ' Specifies that the dynamic method declared above has a an MSIL implementation, 
      ' is managed, synchronized (single-threaded) through the body, and that it  
      ' cannot be inlined.

      myMthdBuilder.SetImplementationFlags((MethodImplAttributes.IL Or _
					    MethodImplAttributes.Managed Or _
					    MethodImplAttributes.Synchronized Or _

      ' Create an ILGenerator for the MethodBuilder and emit MSIL here ...

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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