private static void AddNotifications(PropertyDefinition property_definition, MethodDefinition notify_method, MethodDefinition collection_notification_method) { // Find backing field FieldDefinition backing_field = property_definition.GetNormalPropertyBackingField().Resolve(); // Import CollectionChanged methods Type backing_field_type = backing_field.GetAssemblyQualifiedName(); MethodReference collection_remove_handler = property_definition.Module.Import(backing_field_type.GetMethod("remove_CollectionChanged")); MethodReference collection_add_handler = property_definition.Module.Import(backing_field_type.GetMethod("add_CollectionChanged")); MethodReference event_constructor = property_definition.Module.Import(typeof(NotifyCollectionChangedEventHandler).GetConstructors()[0]); // Add notifications ILProcessor processor = property_definition.SetMethod.Body.GetILProcessor(); var first = property_definition.SetMethod.Body.Instructions.First(); var ret = property_definition.SetMethod.Body.Instructions.Last(i => i.OpCode == OpCodes.Ret); var notify_property_nop = processor.Create(OpCodes.Nop); // If (property != null) processor.InsertBefore(first, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(first, processor.Create(OpCodes.Ldfld, backing_field)); processor.InsertBefore(first, processor.Create(OpCodes.Ldnull)); processor.InsertBefore(first, processor.Create(OpCodes.Ceq)); processor.InsertBefore(first, processor.Create(OpCodes.Brtrue_S, first)); // CollectionChanged -= notify method processor.InsertBefore(first, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(first, processor.Create(OpCodes.Ldfld, backing_field)); processor.InsertBefore(first, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(first, processor.Create(OpCodes.Ldftn, collection_notification_method)); processor.InsertBefore(first, processor.Create(OpCodes.Newobj, event_constructor)); processor.InsertBefore(first, processor.Create(OpCodes.Callvirt, collection_remove_handler)); // Existing code is here // If (property != null) processor.InsertBefore(ret, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldfld, backing_field)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldnull)); processor.InsertBefore(ret, processor.Create(OpCodes.Ceq)); processor.InsertBefore(ret, processor.Create(OpCodes.Brtrue_S, notify_property_nop)); // CollectionChanged -= notify method processor.InsertBefore(ret, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldfld, backing_field)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldftn, collection_notification_method)); processor.InsertBefore(ret, processor.Create(OpCodes.Newobj, event_constructor)); processor.InsertBefore(ret, processor.Create(OpCodes.Callvirt, collection_add_handler)); // NotifyPropertyChanged(property) processor.InsertBefore(ret, notify_property_nop); processor.InsertBefore(ret, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldstr, property_definition.Name)); processor.InsertBefore(ret, processor.Create(OpCodes.Call, notify_method)); // Return from method here }
private static void AddConstructorInitialization(PropertyDefinition property_definition) { // Find backing field FieldDefinition backing_field = property_definition.GetNormalPropertyBackingField().Resolve(); // Fix constructor setup of property (ie. add event handler to property, do it by setting property to field) var constructor = property_definition.DeclaringType.GetConstructor(); // Add initialization ILProcessor processor = constructor.Body.GetILProcessor(); var ret = constructor.Body.Instructions.Last(i => i.OpCode == OpCodes.Ret); processor.InsertBefore(ret, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldarg_0)); processor.InsertBefore(ret, processor.Create(OpCodes.Ldfld, backing_field)); processor.InsertBefore(ret, processor.Create(OpCodes.Call, property_definition.SetMethod)); }