System.Reflection.Emit.EventBuilder.SetRaiseMethod C# (CSharp) Method

        public void SetRaiseMethod(System.Reflection.Emit.MethodBuilder mdBuilder) { }
        public void SetRemoveOnMethod(System.Reflection.Emit.MethodBuilder mdBuilder) { }

        static MethodBuilder BuildOnPropertyChanged(System.Reflection.Emit.TypeBuilder typeBuilder, EventBuilder eventBuilder, FieldInfo eventBackingField)
        {
            var raisePropertyChanged = typeBuilder.DefineMethod("OnPropertyChanged", MethodAttributes.Private, typeof(void), new[] {typeof(string)});
            var generator = raisePropertyChanged.GetILGenerator();
            var returnLabel = generator.DefineLabel();

            generator.DeclareLocal(typeof(PropertyChangedEventHandler));
            generator.Emit(OpCodes.Ldarg_0);
            generator.Emit(OpCodes.Ldfld, eventBackingField);
            generator.Emit(OpCodes.Stloc_0);
            generator.Emit(OpCodes.Ldloc_0);
            generator.Emit(OpCodes.Ldnull);
            generator.Emit(OpCodes.Ceq);
            generator.Emit(OpCodes.Brtrue, returnLabel);

            generator.Emit(OpCodes.Ldloc_0);
            generator.Emit(OpCodes.Ldarg_0);
            generator.Emit(OpCodes.Ldarg_1);
            generator.Emit(OpCodes.Newobj, _createEventArgs.Value);
            generator.Emit(OpCodes.Callvirt, Info<ProgressChangedEventHandler>.GetMethod("Invoke").First().MethodInfo);

            generator.MarkLabel(returnLabel);
            generator.Emit(OpCodes.Ret);

            eventBuilder.SetRaiseMethod(raisePropertyChanged);
            return raisePropertyChanged;
        }