如何将列 header 绑定到 ViewModel 中的属性？ (WPF MVVM)

Question

I Have window that have DataContext that is bind to ViewModel object (VM1 for the example). VM1 have a lot of properties and one of them is a string that called "MyTitle".

I have a DataGridTextColumn in 'Window\Grid\DataGrid'. How can I bind the property "Header" in DataGridTextColumn to the Property "MyTitle" in my VM1 ViewModel?

Thanks!

Answer 1

Unfortunately, the column definitions of the DataGrid don't inherit the DataContext , because they're not part of the visual tree, so you can't bind directly to the ViewModel. You need to resort to a workaround such as the one described in this article :

<DataGrid.Resources>
    <local:BindingProxy x:Key="proxy" Data="{Binding}" />
</DataGrid.Resources>

...

<DataGridTextColumn Header="{Binding Data.MyTitle, Source={StaticResource proxy}}"/>

Answer 2

The accepted answer didn't work for me.

I was able to make this work.

<FrameworkElement x:Name="proxy" DataContext="{Binding}"/>

<DataGridTextColumn Header="{Binding Source={x:Reference proxy}, Path=DataContext.MyTitle}/>

Answer 3

There is no need to use a binding proxy, like too often suggested. Obviously, DataGridColumn.Header is not a DependencyProperty . To still bind it, simply define the Header explicitly using XAML property element syntax, and bind the header content:

<DataGrid>
  <DataGrid.Columns>
    <DataGridTextColumn>
      <DataGridTextColumn.Header>
        <TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType=DataGrid}, Path=DataContext.TextValue}" />
      </DataGridTextColumn.Header>
    </DataGridTextColumn>
  </DataGrid.Columns>
</DataGrid>