public static IEnumerable <MethodInfo> GetSubscribedMethods(this EventInfo ev, object instance)
{
var flags = BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static | BindingFlags.GetField;
if (instance == null)
{
flags |= BindingFlags.Static;
}
FieldInfo f = ev.DeclaringType.GetField(ev.Name, flags);
if (f != null)
{
var d = (System.Delegate)f.GetValue(instance);
return(d.GetInvocationList().Select(s => s.Method));
}
else
{
// it's a custom implementation of event handler, handle the most used cases
if (instance is System.ComponentModel.Component)
{
var c = (System.ComponentModel.Component)instance;
var evList = (System.ComponentModel.EventHandlerList)c.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic)
.GetValue(instance, null);
// magic scanner here that will probably not work all the time
// in System.Windows.Forms the Events are stored in an EventHandlerList
// the keys of those events are static fields defined, but no standard naming is used
// in Control it's all Event<EventName>, in Form it's EVENT_<EVENTNAME>
// best way to determine actual field is to inspect the IL of the add method, find the static private field info that
// is used
FieldInfo eventFieldKey = null;
MethodInfo addMethod = ev.GetAddMethod();
while (addMethod != null)
{
var instructions = addMethod.GetILInstructions();
eventFieldKey = instructions.Where(i => i.Code == OpCodes.Ldsfld && ((FieldInfo)i.Operand).Name.ToLower().StartsWith("event"))
.Select(i => (FieldInfo)i.Operand)
.FirstOrDefault();
if (eventFieldKey != null)
{
Delegate d = evList[eventFieldKey.GetValue(instance)];
if (d != null)
{
return(d.GetInvocationList().Select(s => s.Method));
}
else
{
return(Enumerable.Empty <MethodInfo>());
}
}
else
{
// it's possible that it's defined in base.addMethod
// go look for the base call
var baseMethod = instructions.Where(i => i.Code == OpCodes.Call && ((MethodInfo)i.Operand).Name == addMethod.Name)
.Select(i => (MethodInfo)i.Operand)
.FirstOrDefault();
addMethod = baseMethod;
}
}
}
else if (instance is System.Windows.UIElement)
{
var c = (System.Windows.UIElement)instance;
var evStore = c.GetType().GetProperty("EventHandlersStore", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.FlattenHierarchy)
.GetValue(c, null);
if (evStore != null)
{
MethodInfo getRoutedEventHandlers = evStore.GetType().GetMethod("GetRoutedEventHandlers", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
MethodInfo addMethod = ev.GetAddMethod();
while (addMethod != null)
{
var instructions = addMethod.GetILInstructions();
FieldInfo eventFieldKey = null;
// ClickEvent, SubmenuClosedEvent, etc..
eventFieldKey = instructions.Where(i => i.Code == OpCodes.Ldsfld && ((FieldInfo)i.Operand).Name.ToLower().EndsWith("event"))
.Select(i => (FieldInfo)i.Operand)
.FirstOrDefault();
if (eventFieldKey != null)
{
System.Windows.RoutedEvent re = (System.Windows.RoutedEvent)eventFieldKey.GetValue(null);
var eventhandlers = (System.Windows.RoutedEventHandlerInfo[])getRoutedEventHandlers.Invoke(evStore, new object[] { re });
List <MethodInfo> methods = new List <MethodInfo>();
foreach (var evhandler in eventhandlers)
{
Delegate d = evhandler.Handler;
if (d != null)
{
methods.Add(d.Method);
}
}
return(methods);
}
else
{
// it's possible that it's defined in base.addMethod
// go look for the base call
var baseMethod = instructions.Where(i => i.Code == OpCodes.Call && ((MethodInfo)i.Operand).Name == addMethod.Name)
.Select(i => (MethodInfo)i.Operand)
.FirstOrDefault();
addMethod = baseMethod;
}
}
}
}
}
throw new Exception("Unable to evaluate event, custom event wiring is used");
}
public TextChangedEventArgs(System.Windows.RoutedEvent id, UndoAction action)
{
}
public TextChangedEventArgs(System.Windows.RoutedEvent id, UndoAction action, ICollection <TextChange> changes)
{
}
public DialogRoutedEventArgs(DialogResult dialogResult, System.Windows.RoutedEvent routedEvent, object source)
: base(routedEvent, source)
{
this.dialogResult = dialogResult;
}
public DialogRoutedEventArgs(DialogResult dialogResult, System.Windows.RoutedEvent routedEvent)
: base(routedEvent)
{
this.dialogResult = dialogResult;
}
public SelectionChangedEventArgs(System.Windows.RoutedEvent id, System.Collections.IList removedItems, System.Collections.IList addedItems)
{
}
