Adding .cs in a ResourceDictionary ?

Question

Hello. I have DataTemplate in a ressource dictionnary, and in some, I need button and i don't know how i can use code behind for manage events.

I tried to put a class in my resource dictionnary like that :

<ResourceDictionary 
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   x:Class="SLProject.Templates"
   x:Class="TVTemplate">

And I definied the class in the cs file like that :

namespace SLProject.Templates
{
    partial class TVTemplate
    { 

    }
}

The build is OK but when the application started, I obtains XAML error following :

AG_E_PARSER_BAD_TYPE

I tried all I know like change the class kind to a ClassModifier, make the class to an inherited class of RessourceDictionnary ... no way.

Someone have an idee ...

Thanks.

Answer 1

You have the x:Class attribute defined twice, which is why you're getting the parser error. Change your declaration to this and it should work:

<ResourceDictionary 
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   x:Class="SLProject.Templates.TVTemplate">

Answer 2

I Checked, and it's just an error of copy-past. I have well the class definied one time.

Answer 3

Resource dictionaries can not have a code-behind class. Remove the x:Class.

To get a datatemplate with code behind event handling you will need to make a user control named TVTemplateView and then use it in your data template:

<DataTemplate TargetType="TVtemplate">
  <TVTemplateView />
</DataTemplate >

Answer 4

Using the x:Class attribute allows you to define a codebehind for a ResourceDictionary. You must specify the complete namespace of the class (i.e. x:Class="WpfApplication.MyClass"), and such class has to be defined as partial (at least VS 2010 complains and does not compile without such modifier).

I mocked-up a simple example:

1. Create a new WPF application project (WpfApplication)

2. Add a new class file (TestClass.cs) and paste the following code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using System.Windows;

namespace WpfApplication
{
    public partial class TestClass
    {
        private void OnDoubleClick(object obj, MouseButtonEventArgs args)
        {
            MessageBox.Show("Double clicked!");
        }
    }
}

3. Add a new ResourceDictionary (Resources.xaml), open the file and paste the following code

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    x:Class="WpfApplication.TestClass">
    <Style TargetType="{x:Type Label}">
        <EventSetter Event="Label.MouseDoubleClick" Handler="OnDoubleClick"/>
    </Style>
</ResourceDictionary>

4. Finally, open the MainWindow.xaml and past the following code

<Window x:Class="WpfApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <ResourceDictionary Source="Resources.xaml"/>
    </Window.Resources>
    <Grid>
        <Label Content="Double click here..." HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Background="Red"/>
    </Grid>
</Window>

In the example I wire-up a double-click event from a Style, since it is a scenario requiring you to call some code from a ResourceDictionary.