CODEWITHSUNDEEP
wpfdatagridview
Marschal
Marschal

Reputation: 183

WPF edit autogenerated column header text

I'm using a WPF DataGrid to display DataTable's. I need to be able to edit this bound DataTables (Two-Way Binding).

I'm using the DataGrid as followed:

<DataGrid SelectionUnit="CellOrRowHeader" IsReadOnly="False" AutoGenerateColumns="True" ItemsSource="{Binding Path=SelectedItem.BindableContent, FallbackValue={x:Null}}" />

The Problem I have, the user can't edit the ColumnHeader's like cell content or rows. The Screenshot below illustrates that porblem. The only thing I can do is sort the columns. Is there a way to edit the column headers too, for example when the user clicks twice, or presses F2.

Maybe some Style' or a HeaderTemplate will do the job? I have already tried some styles and control templates I've found around the internet, but without any success.

Editable Cells, but not editable Col Headers

EDIT:

I managed to display the column headers in a TextBox (and not in a TextBlock) within the AutogeneratingTextcolumn event handler:

Column Header Text in TextBox

private void _editor_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e) {
  // First: create and add the data template to the parent control
  DataTemplate dt = new DataTemplate(typeof(TextBox));
  e.Column.HeaderTemplate = dt;

  // Second: create and add the text box to the data template
  FrameworkElementFactory txtElement =
      new FrameworkElementFactory(typeof(TextBox));
  dt.VisualTree = txtElement;

  // Create binding
  Binding bind = new Binding();
  bind.Path = new PropertyPath("Text");
  bind.Mode = BindingMode.TwoWay;

  // Third: set the binding in the text box
  txtElement.SetBinding(TextBox.TextProperty, bind);
  txtElement.SetValue(TextBox.TextProperty, e.Column.Header);
}

But I couldn't manage to set the binding correctly, if i edit the Text in the TextBoxes, it does not change the text in the Column.Header-Property (which is auto-generated by a binding to a DataTable like explained above).

Upvotes: 0

Views: 944

Answers (1)

Bernhard Heinzelreiter
Bernhard Heinzelreiter

Reputation: 53

You forgot to set the source of your binding and you mustn't set the value after the registration of the binding. The correct code would be the following: 

private void asdf_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
    {
        DataTemplate dt = new DataTemplate(typeof(TextBox));
        e.Column.HeaderTemplate = dt;

        FrameworkElementFactory txtElement =
            new FrameworkElementFactory(typeof(TextBox));
        dt.VisualTree = txtElement;

        Binding bind = new Binding();
        bind.Path = new PropertyPath("Header");
        bind.Mode = BindingMode.TwoWay;
        // set source here
        bind.Source = e.Column;

        txtElement.SetBinding(TextBox.TextProperty, bind);
        // You mustn't set the value here, otherwise the binding doesn't work
        // txtElement.SetValue(TextBox.TextProperty, e.Column.Header);
    }

Additionally you must change the binding property to Header, because you are adding the binding to the text property of the TextBox.

Upvotes: 1

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