private static void PropertyChangedCallback(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
string attachString = dependencyPropertyChangedEventArgs.NewValue as string;
if (!string.IsNullOrWhiteSpace(attachString))
{
EventHandlerList handlerHelpers = new EventHandlerList();
string[] attachStrings = attachString.Split(';');
foreach (string s in attachStrings)
{
var trimString = s.Trim();
if (!string.IsNullOrEmpty(trimString))
{
var newHandler = new EventHandlerInstance {
Attach = trimString
};
handlerHelpers.Add(newHandler);
}
}
SetList(dependencyObject, handlerHelpers);
}
}
private static void ListChangedCallback(DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
EventHandlerList oldHandlerList = dependencyPropertyChangedEventArgs.OldValue as EventHandlerList;
if (oldHandlerList != null)
{
foreach (EventHandlerInstance eventHandlerInstance in oldHandlerList)
{
eventHandlerInstance.Disconnect();
}
}
EventHandlerList newList = dependencyPropertyChangedEventArgs.NewValue as EventHandlerList;
if (newList != null)
{
foreach (EventHandlerInstance eventHandlerInstance in newList)
{
eventHandlerInstance.Connect(dependencyObject);
}
}
}
public static void SetList(DependencyObject obj, EventHandlerList value)
{
obj.SetValue(InternalListProperty, value);
}
