Adding Header Style to DataGrid overrides (hides) data using Binding on header

Question

I need to Style the WPF dataGrid headers AND bind the header data.

Binding works OK using:

<TextBlock Text="{Binding DataContext.HeadData, 
        RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" />

If I now add a header style to the DataGrid, the TextBlock in the style overrides the binding data.

I'm using all the latest Dot-Net and VS 2019.

Any idea how to marry the two requirements? It's consumed me!

Rich

Answer 1

Ok, I've tried it myself and this is the solution I've found:

You have to define the TextBlock inside the Style definition

<Style x:Key="MyHeaderStyle" TargetType="{x:Type DataGridColumnHeader}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
                <TextBlock Text="{Binding DataContext.HeadData, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

In some way, setting an Header Style, and specifying an Header content gives conflict. So you have to move everything inside the style.

Obviously you use the Style just like this.

<DataGridTextColumn HeaderStyle="{StaticResource MyHeaderStyle}" />

Hope I've been helpful.

EDIT

This solution doesn't works (or else, it works for one column only DataGrid). In the comments I linked a solution given on a different question, that could be used here as well.