Binding/Referencing Method to XAML WPF

Question

I have this xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:l="clr-namespace:My.Windows"
                    >
    <ObjectDataProvider x:Key="TitledWindow_Test" MethodName="Test" ObjectInstance={x:Type l:TitledWindow}">
    <ControlTemplate x:Key="TitledWindowControlTemplateKey" x:Name="PART_ControlTemplate" TargetType="{x:Type l:TitledWindow}"
        <Rectangle>
            <Rectangle.Style>
                <EventSetter Event="Mouse.MouseEnter" Handler="{StaticResource TitledWindow_Test}">
            </Rectangle.Style>
        </Rectangle>
    </ControlTemplate>
</ResourceDictionary>

And my c# code:

namespace My.Windows
{
    public partial class TitledWindow : Window
    {
        public void Test()
        {
            MessageBox.Show("Test");
        }
    }
}

The problem is that i get the following error:

Error 1
'ResourceDictionary' root element requires a x:Class attribute to support event handlers in the XAML file. Either remove the event handler for the MouseEnter event, or add a x:Class attribute to the root element.

Answer 1

Well you can do that by attaching code behind to your ResourceDictionary. Few simple steps to achieve that are:

• Say ResourceDictionary file name is CustomResources.xaml. Add another file in same directory besides your ResourceDictionary with name CustomResources.xaml.cs. Create partial class CustomResources inheriting from ResourceDictionary.

Declare your handler for MouseEnter and code behind is ready.

using System;
using System.Windows;
namespace WpfApplication1
{
    public partial class CustomResources : ResourceDictionary
    {
        public void MouseEnter(object sender, EventArgs e)
        {
            MessageBox.Show("Test");
        }
    }
}

• Now, in XAML set x:Class attribute and set handler to MouseEnter.

XAML :

<ResourceDictionary
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="WpfApplication1.CustomResources"
             xmlns:local="clr-namespace:WpfApplication1">
    <ControlTemplate x:Key="TitledWindowControlTemplateKey" 
                     x:Name="PART_ControlTemplate"
                     TargetType="{x:Type local:TitleWindow}">
        <Rectangle>
            <Rectangle.Style>
                <Style TargetType="Rectangle">
                    <EventSetter Event="Mouse.MouseEnter" Handler="MouseEnter"/>
                </Style>
            </Rectangle.Style>
        </Rectangle>
    </ControlTemplate>    
</ResourceDictionary>