public static void RemoveListChangedEventHandler(this FormCollection collection, ListChangedEventHandler eventHandler, ListChangedType changedType)
{
var innerListlistFieldInfo = collection.GetType().BaseType.GetField("list", fieldBindingFlags);
var innerlist = innerListlistFieldInfo?.GetValue(Application.OpenForms);
if (!(innerlist is ObservableArrayList))
{
var newInnerList = new ObservableArrayList();
foreach (var item in innerlist as ArrayList)
{
newInnerList.Add(item);
}
innerListlistFieldInfo.SetValue(Application.OpenForms, newInnerList);
}
if (innerListlistFieldInfo?.GetValue(Application.OpenForms) is ObservableArrayList currentInnerList)
{
switch (changedType)
{
case ListChangedType.Added:
currentInnerList.Added -= eventHandler;
break;
case ListChangedType.Removed:
currentInnerList.Removed -= eventHandler;
break;
}
}
}
