Binding to DataGridTemplateColumn

Question

I have a User table and I have a foreign key of this table from a Book table. the FK is ProxyResponsibleUser_ID. when I use DataGridTextColumn in my DataGrid anything is OK but now I want to use DataGridTemplateColumn to display the FullName column from User table for corresponding user with ProxyResponsibleUser_ID. I get an error since DataGridTemplateColumn does not have a Binding property.

So, by which property of DataGridTemplateColumn will I bind the ProxyResponsibleUser_ID? Thanks in advance.

<DataGridTextColumn x:Name="securityConfigurationNameColumn" Binding="{Binding Path=SecurityConfigurationName}" Header="Security Configuration Name" Width="*" />
<DataGridTemplateColumn x:Name="proxyResponsibleUser_IDColumn"   Binding="{Binding Path=ProxyResponsibleUser_ID}" Header="Proxy Responsible User ID" Width="*" >
                <DataGridTemplateColumn.CellEditingTemplate>
                    <DataTemplate DataType="{x:Type domain:User}">
                        <TextBlock Text="{Binding FullName}"/>
                    </DataTemplate>
                </DataGridTemplateColumn.CellEditingTemplate>
            </DataGridTemplateColumn>

Dan · Accepted Answer · 2012-07-30 22:06:51Z

I have been struggling with this question for quite a while, and after many fruitless searches, I came up with an acceptable substitute.

To anyone else searching for this: Try creating a custom implementation of DataGridBoundColumn. You will only need to override two methods: GenerateElement and GenerateEditingElement.

Example:

protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
{
    Label element = new Label();
    element.SetBinding(Label.ContentProperty, Binding);

    return element;
}

Usage:

<DataGrid>
    <DataGrid.Columns>
        <DataGridCustomColumn Binding="{Binding SomeProperty}" />
        <DataGridCustomColumn Binding="{Binding OtherProperty}" />
    </DataGrid.Columns>
</DataGrid>

Though I originally intended to use templates, I have opted to create elements in the code-behind as my needs are rather simple; however, I see no reason why this could not be adapted to work with DataTemplates given the proper DependencyProperty registrations.

HCL · Accepted Answer · 2010-09-01 11:13:19Z

0

I don't see exactly what you want to do, but the Binding has to be done at the TextBlock exactly as you already did. Therefore the Binding in the DataGridTemplateColumn-Tag is needless. There is no need for the column to know the id of the record.

If you want to have the id available to the TextBox-control (commonly not needed because you have access to this property directly through the DataContext), you can do this for example by binding the Tag-property.

<TextBlock Text="{Binding FullName}" Tag="{Binding ProxyResponsibleUser_ID}"/>

By the way, you declared a TextBlock in the EditTemplate. Maybe you want a TextBox. Or do you want to allow the user to change the Id? Make a comment if this is the case.

Hope this helps.

edited Sep 1, 2010 at 11:13

answered Sep 1, 2010 at 11:08

HCL

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3 Comments

cemregoksu Over a year ago

Normally I was using DataGridTextColumn to display the FullName via the User navigation by Entity FrameWork. When I change a combobox's selected item, I want the datagrid value to be updated but when I do so, there had been update problems. bur when I use directly the proxyResponsibleUser_ID, it is automatically updated but in data grid Id values are displayed instead of Fullname. So I tried such a code snippet. Thanks for your help but it didn't work. Can you suggest a solution for such a problem? Thank you again..

cemregoksu Over a year ago

No I dont want anybody to edit the column, I used it by mistake :p now I used celltemplate

HCL Over a year ago

Sounds to me as an EF-problem (synchronizing between key and navigation-property). But I'm sorry, I have no knowledge about EF and therefore can not help you in this case. However for the question you wrote, DataGridTemplateColumn has no need to know the Binding. All binding-specific declaration is done in the DataTemplate/s. I would try to ask a more EF-specific question to get a more valuable answer than mine (my answer is only WPF-specific).

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