GridViewDataColumn DataTemplate with DataType is not working

[Rene]

Hey guys,
I've got a problem which is really frustrating. I am trying to display content based on its type in a RadGridView. Therefore I am using a DataTemplate referenced to a DataType. Sadly it seems like the DataType isnt beeing recognized at all. If I change the DataMemberBinding from "{Binding}" to a member of the object which is of type string - it is working but thats not what I need, i need it to be working with my own Data types(classes). 

Code:

XAML

<Window x:Class="RadControlsWpfApp1.MainWindow"
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
                xmlns:local="clr-namespace:RadControlsWpfApp1"
                xmlns:System="clr-namespace:System;assembly=mscorlib"
                Title="MainWindow" Height="350" Width="525">
        <Grid>
        <telerik:RadGridView x:Name="Grid" Grid.Column="1" Margin="11,10,9,50" Grid.Row="1" ItemsSource="{Binding}" >
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn IsReadOnly="True" Header="test" DataMemberBinding="{Binding}" >
                    <telerik:GridViewDataColumn.Resources>
                        <DataTemplate DataType="{x:Type local:Foo}">
                            <TextBlock Text="test" />
                        </DataTemplate>
                    </telerik:GridViewDataColumn.Resources>
                </telerik:GridViewDataColumn>
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>

    </Grid>
</Window>

CS:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace RadControlsWpfApp1
{
    public class Foo
    {
        public string Name { get; set; }
        public string Value { get; set; }
    }
    public class Foo2
    {
        public string Name { get; set; }
        public string Value { get; set; }
    }

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    ///
    public partial class MainWindow : Window
    {

        public MainWindow()
        {
            var list = new List<object> { new Foo2() { Name = "Brian2", Value = "val2" }, new Foo() { Name = "Brian", Value = "val1" } };


            InitializeComponent();
            Grid.DataContext = list;
        }
    }
}

[Dimitrina]

Hello,

Actually this is how the Binding works. As you set DataMemberBinding="{Binding}", 
the .ToString() method of the bound item (which is of type Foo2 or Foo) will be invoked and the result will be displayed in the cell.

If you would like to work with your full item, I can suggest you to use a Converter for the Binding and have the original item when the converter is evaluated. Another option would be to override the ToSting() methods of your classes and return the string you would like to have displayed.

Regards,
Didie
Telerik

[Tom]

Why is this so hard!

It is so damn frustrating, I have the same column of type MyType all over the place and I cannot get the column to apply the DataTemplate I have defined in another resources file, it should be an option in the RadGrid like ColumnDataTemplatesMode="DataType". Or there should be a telerik DataTemplateGridViewColumn that still accepts DataMemberBinding but attempts to resolve the DataTemplate instead of using ToString. I really can see no reason for you to make this so awkward and require devs to create hundreds of wrapper DataTemplates?

[Yoan]

Hello,

For such scenario, we had created our CellTemplateSelector. You can easily get the dataType of the column like so:

public override System.Windows.DataTemplate SelectTemplate(object item, System.Windows.DependencyObject container)
       {
           var cell = container as GridViewCell;
           if (cell != null)
           {
               var columnDataType = (cell.Column as GridViewBoundColumnBase).DataType;
           }

Regards,
Yoan
Telerik by Progress