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));
}
