Only number accepted for DataGridTextColumn

[hxhgxy]

I made attach property for TextBox to accept numbers only. How can I apply this to DataGridTextColumn?
Thanks,

` public static bool GetIsOnlyNumber(DependencyObject obj)
{
return (bool)obj.GetValue(IsOnlyNumberProperty);
}

	public static void SetIsOnlyNumber(DependencyObject obj, bool value)
	{
		obj.SetValue(IsOnlyNumberProperty, value);
	}

	public static readonly DependencyProperty IsOnlyNumberProperty =
	    DependencyProperty.RegisterAttached("IsOnlyNumber", typeof(bool), typeof(TextBox), new PropertyMetadata(false,
	        (s, e) =>
	        {
		        if (s is TextBox textBox)
		        {
			        textBox.SetValue(InputMethod.IsInputMethodEnabledProperty, !(bool)e.NewValue);
			        textBox.PreviewTextInput -= TxtInput;
			        if ((bool)e.NewValue)
			        {
				        textBox.PreviewTextInput += TxtInput;
			        }
		        }
	        }));

	private static void TxtInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
	{
		e.Handled = new Regex("[^0-9.]+").IsMatch(e.Text);
	}

`

[nicolaihenriksen]

@hxhgxy You should be able to achieve this by applying your attached property to the style used for the "editing element". When a data grid cell of a DataGridTextColumn enters edit mode, it displays a TextBox and that TextBox is then styled using the DataGridTextColumn.EditingElementStyle.

So you should define a named Style targeting a Textbox and then apply your attached property in a <Setter /> on that style. You then need to point to that style in the EditingElementStyle of your DataGridTextColumn.

[hxhgxy]

Thanks. If so, it is easier to use DataGridTemplateColumn, right? I'm using TextBox under DataGridTemplateColumn and set the attached property on TextBox currently.

[nicolaihenriksen]

If you find that easier, then of course you can do that 😃 There are typically multiple ways of achieving the same goal.

Note: you could possibly be "missing out" on some built-in features of the DataGrid when using a DataGridTemplateColumn, because it now lacks knowledge of the contents in the column. Here I am thinking sorting, and stuff like that. I don't know for sure though, so you would need to experiment with that on your own.