I'm using a custom Attached Event that I created and I'm trying to add a handler to this event
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void dataGridTasks_Drop(object sender, RoutedEventArgs e)
{
}
}
Here the XAML code
<ListView util:DragDropHelper.Drop="dataGridTasks_Drop">
I have this error in runtime at InitializeComponent
Object of type 'System.String' cannot be converted to type 'System.Windows.RoutedEventHandler'.
Anyone knows why i'm getting this error ? Thanks !
Here my Event code
public static readonly RoutedEvent DropEvent = EventManager.RegisterRoutedEvent(
"Drop", RoutingStrategy.Bubble, typeof(DropEventArgs), typeof(DragDropHelper));
public static void AddDropHandler(DependencyObject d, RoutedEventHandler handler)
{
UIElement uie = d as UIElement;
if (uie != null)
{
uie.AddHandler(DragDropHelper.DropEvent, handler);
}
}
public static void RemoveDropHandler(DependencyObject d, RoutedEventHandler handler)
{
UIElement uie = d as UIElement;
if (uie != null)
{
uie.RemoveHandler(DragDropHelper.DropEvent, handler);
}
}
DropEventArgs code
class DropEventArgs : RoutedEventArgs
{
public object Data { get; private set; }
public int Index { get; private set; }
public DropEventArgs(RoutedEvent routedEvent, object data, int index)
: base(routedEvent)
{
Data = data;
Index = index;
}
}
After few hours checking the samples and my code, the problem was because of event definition of the Event indeed.(Thanks Mihir and Dabblernl).
I've done a mistake in the 3rd argument of RegisterRoutedEvent method by providing the event type instead of a Handler type.
The correct code is the following :
public delegate void DropEventHandler(object sender, DropEventArgs e);
public static readonly RoutedEvent DropEvent = EventManager.RegisterRoutedEvent(
"Drop", RoutingStrategy.Bubble, typeof(DropEventHandler), typeof(DragDropHelper));
The error message was misleading.