public static IDisposable SubscribeWeakly <TSender, TProperty>(
this TSender sender,
Expression <Func <TSender, TProperty> > property,
Action <TProperty> method)
where TSender : class, INotifyPropertyChanged
{
if (method == null)
{
throw new ArgumentNullException("method");
}
var subscriber = method.Target;
var methodInfo = method.Method;
if (subscriber == null || methodInfo.IsStatic)
{
throw new InvalidOperationException("Static methods are not supported");
}
var propertyName = sender.GetPropertyName(property);
var openHandler = GetOpenHandler.FromEventAction <TProperty>(methodInfo);
var getProperty = property.Compile();
return(sender.SubscribeWeakly(
subscriber,
(t, s, e) =>
{
if (e == null ||
string.IsNullOrEmpty(e.PropertyName) ||
string.Equals(e.PropertyName, propertyName))
{
openHandler(t, getProperty.Invoke(s));
}
}));
}
public static IDisposable OnCustomDelegate <TEventHandler, TEvent>(
Func <Action <object, TEvent>, TEventHandler> convertActionToHandler,
Action <TEventHandler> subscribe,
Action <TEventHandler> unsubscribe,
Action <object, TEvent> method)
where TEventHandler : class
where TEvent : class
{
return(OnCustomDelegate(
convertActionToHandler,
subscribe,
unsubscribe,
method.Target,
GetOpenHandler.FromEventHandler <TEvent>(method.Method)));
}