FrameworkElementFactory AddHandler

Question

I can't get this to work. It keeps throwing an exception that says "Handler is an invalid type."

Code:
 

factory.AddHandler(TextBlock.DragLeaveEvent, new RoutedEventHandler(Test));

private void Test(object sender, RoutedEventArgs e)

{

SetTitleTemplate();

}

What am I doing wrong?  DragLeaveEvent is of Type RoutedEvent.

Thanks.

Answer 1

Thought I would add the whole code block:

foreach (Column column in this.Columns)

{

DataTemplate template = new DataTemplate();

FrameworkElementFactory factory = new FrameworkElementFactory(typeof(TextBlock));

factory.RemoveHandler(TextBlock.LostMouseCaptureEvent, new RoutedEventHandler(Test));

factory.SetValue(TextBlock.MinHeightProperty, 10.0);

factory.SetValue(TextBlock.VerticalAlignmentProperty, VerticalAlignment.Bottom);

factory.SetValue(TextBlock.ForegroundProperty, _labelBrush);

factory.SetValue(TextBlock.TextWrappingProperty, TextWrapping.WrapWithOverflow);

factory.SetValue(TextBlock.FontSizeProperty, 11.0);

factory.SetValue(TextBlock.FontFamilyProperty, fontFamily);

factory.SetValue(TextBlock.TextProperty, column.Title.ToString());

factory.SetValue(TextBlock.WidthProperty, column.Width);

factory.AddHandler(TextBlock.LostMouseCaptureEvent, new RoutedEventHandler(Test));

template.VisualTree = factory;

column.TitleTemplate = template;

}

Answer 2

NM. I figured it out.

Answer 3

Hi Greg,

I have the exact problem you had.  I cannot find any resolution or even anyone else with the same problem.  Can you please tell me how you resolved the problem?

Many thanks

Answer 4

Or may be someone else can help?

Answer 5

I have the same problem, how did you solve it?

Answer 6

Ok I got it,

 

The event which we attach has to be of type System.Windows.RoutedEventHandler and not user defined!

public event System.Windows.RoutedEventHandler textLostFocus;

 

            // Create TextBox
            FrameworkElementFactory textBoxFactory = new FrameworkElementFactory(typeof(System.Windows.Controls.TextBox));
            textBoxFactory.AddHandler(System.Windows.Controls.TextBox.LostFocusEvent, this.textLostFocus );

 

works fine :)

Answer 7

Hi  vijaykamat

I got the same problem but I can't solve it from the way that you done it

I have a method like this:

  private void TextBlock_MouseDown(object sender, MouseButtonEventArgs e)

        {

// just a break point for now

        }

 

and my code looks like the below:

  FrameworkElementFactory newTextBlock = new FrameworkElementFactory(typeof(TextBlock));

  newTextBlock.AddHandler(TextBlock.MouseDownEvent, this.TextBlock_MouseDown);

 

  but the last line gave me the below error:

 

 

  Error 1 The best overloaded method match for 'System.Windows.FrameworkElementFactory.AddHandler(System.Windows.RoutedEvent, System.Delegate)' has some invalid arguments

  Error 2 Argument 2: cannot convert from 'method group' to 'System.Delegate'

 

Answer 8

TextBlock_MouseDown is the system delegate or u have written it?

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Answer 9

Thanks for reply. It's system routedevent in WPF and I finally sort it out like the below: newTextBlock.AddHandler(TextBlock.MouseDownEvent, new MouseButtonEventHandler(TextBlock_MouseDown));

Answer 10

谢谢!帮了我大忙。

Answer 11

谢谢!帮了我大忙。