protected virtual void StopListeners(IDataObject data)
{
foreach (IDragSource dragSource in DragSourceHelper.DataOfType <IDragSource>(data))
{
dragSource.DragCanceled -= new EventHandler <DragCanceledEventArgs>(this.DragSourceDragCanceled);
dragSource.GiveFeedback -= new GiveFeedbackEventHandler(this.DragSourceGiveFeedback);
dragSource.DragFinished -= new EventHandler <EventArgs>(this.DragSourceDragFinished);
}
}
public static IEnumerable <T> DataOfType <T>(IDataObject data)
{
if (data != null)
{
foreach (T obj in DragSourceHelper.DataOfType <T>(new SafeDataObject(data)))
{
yield return(obj);
}
}
}
public static bool FirstDataOfType <T>(SafeDataObject data, ref T result)
{
using (IEnumerator <T> enumerator = DragSourceHelper.DataOfType <T>(data).GetEnumerator())
{
if (enumerator.MoveNext())
{
T current = enumerator.Current;
result = current;
return(true);
}
}
return(false);
}
public static IEnumerable <T> DataOfType <T>(SafeDataObject data)
{
if (data != null)
{
T result = default(T);
foreach (string format in data.GetFormats())
{
if (DragSourceHelper.InternalDataOfType <T>(data.GetData(format), ref result))
{
yield return(result);
}
}
}
}