private static MethodDefinition CreateEventAddMethod(AssemblyDefinition assemblyDefinition,
            FieldReference propertyChangedFieldDefinition)
        {
            var addMethodDefinition = assemblyDefinition.MainModule.Import(typeof(Delegate).GetMethod("Combine",
                new[] { typeof(Delegate), typeof(Delegate) }));
            var addPropertyChanged = new MethodDefinition("add_PropertyChanged", MethodAttributes.Public |
                                                                                 MethodAttributes.SpecialName |
                                                                                 MethodAttributes.NewSlot |
                                                                                 MethodAttributes.HideBySig |
                                                                                 MethodAttributes.Virtual |
                                                                                 MethodAttributes.Final,
                assemblyDefinition.MainModule.Import(typeof(void)));
            addPropertyChanged.Parameters.Add(
                new ParameterDefinition(assemblyDefinition.MainModule.Import(typeof(PropertyChangedEventHandler))));
            addPropertyChanged.Overrides.Add(
                assemblyDefinition.MainModule.Import(typeof(INotifyPropertyChanged).GetMethod("add_PropertyChanged")));
            var il = addPropertyChanged.Body.GetILProcessor();
            il.Emit(OpCodes.Ldarg_0);
            il.Emit(OpCodes.Ldarg_0);
            il.Emit(OpCodes.Ldfld, propertyChangedFieldDefinition);
            il.Emit(OpCodes.Ldarg_1);
            il.Emit(OpCodes.Call, addMethodDefinition);
            il.Emit(OpCodes.Castclass, assemblyDefinition.MainModule.Import(typeof(PropertyChangedEventHandler)));
            il.Emit(OpCodes.Stfld, propertyChangedFieldDefinition);
            il.Emit(OpCodes.Ret);
            return addPropertyChanged;
        }