/// <summary> Helps to safely raise an event.
/// </summary>
/// <param name="delegate">The event delegate (<see cref="EventHandler"/>, <see cref="EventHandler{T}"/></param>
/// <param name="sender">The sender</param>
/// <param name="e">The event arguments</param>
/// <param name="uniqueId">A unique ID</param>
/// <exception cref="MultiTargetInvocationException"></exception>
public static void Raise(Delegate @delegate, object sender, EventArgs e, string uniqueId)
{
if (@delegate == null)
{
return;
}
#region simple invoke (conditional)
#if (false) // simple invoke the delegate w/o any other stuff (DynamicInvoke is slow!)
try{
@delegate.DynamicInvoke(new[] { sender, e });
} catch (Exception ex) {
if (ObjectVM.IsInDesignMode)
{
return; // ignore designtime error
}
throw; // possible breakpoint for debug
}
return;
#endif
#endregion
// var exceptions=new List<Exception>();
var exceptions = (List <Exception>)null; //don't collect, do throw directly
var invocationList = @delegate.GetInvocationList();
#region Trace (conditional)
#if (false)
Debug.WriteLine("=>Raise event: " + "(" + invocationList.Length + " target" + (invocationList.Length != 1?"s":"") + ")");
foreach (var d in invocationList)
{
var targetType = d.Target.GetType().FullName;
var method = d.Method.ToString();
Debug.WriteLine("=>\t" + "Target: " + targetType + " " + method);
}
Debug.WriteLine("=>\t" + "Raising method: " + sender.GetType().FullName + "." + new StackFrame(1).GetMethod());
// MemberPath (ObjectVM/ObjectBM)
var memberPathProperty = sender.GetType().GetProperty("MemberPath");
if (memberPathProperty != null)
{
var memberPath = memberPathProperty.GetValue(sender, null);
Debug.WriteLine("=>\t" + "MemberPath: " + memberPath);
}
#endif
#endregion
var isInvokeRequired = ApplicationDispatcher.IsInvokeRequired;
foreach (var d in invocationList)
{
#region DEBUG (conditional)
#if (false)
Debug.WriteLine(string.Format("=>Raise event: #{0} {1} {2}",
++InvocationCount,
DebugUtil.FormatTypeName(@delegate),
"Target: " + DebugUtil.FormatTypeName(d.Target) + "." + d.Method.Name
));
#endif
#endregion
// EXPERIMENTAL ==>
// workaround for TargetInvocationException --> InvalidOperationException:
// "The calling thread cannot access this object because a different thread owns it."
// e.g. System.Windows.Input.CanExecuteChangedEventManager+HandlerSink, PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
if (isInvokeRequired)
{
if (d.Target.GetType().FullName == "System.Windows.Input.CanExecuteChangedEventManager+HandlerSink")
{
InvokeAppDispatcher(d, sender, e, exceptions);
}
else if (d.Target.GetType().FullName == "System.Windows.Data.ListCollectionView")
{
InvokeAppDispatcher(d, sender, e, exceptions);
}
/*??*/ else if (d.Target.GetType().Assembly.GetName().Name == "PresentationCore")
{
InvokeAppDispatcher(d, sender, e, exceptions);
}
else
{
Invoke(d, sender, e, exceptions);
}
}
//<==
else
{
Invoke(d, sender, e, exceptions);
}
}
if (exceptions != null && exceptions.Count > 0)
{
var ex = new MultiTargetInvocationException(exceptions);
#region DESIGNER
if (IsInDesignMode)
{
// Trace.Write("=>Begin:" + exceptionCount + "######################################################################################################################################"+"\n");
Trace.Write("=>An unhandled exception has occured. Trying to continue." + "\n" + ex.ToString() + "\n");
foreach (var exception in exceptions)
{
Trace.Write("--------------------------------------------------------------------------------------------------------------------------------------" + "\n"
+ exception.ToString() + "\n");
}
// Trace.Write("=>End :" + exceptionCount + "######################################################################################################################################"+"\n");
return;
}
#endregion
throw ex;
}
}
