Textbox SelectAll on tab but not mouse click

Question

So lets say I have a WPF form with several text boxes, if you tab to the text box and it already has something in it, I want to select all the text in that box so typing wil

Answer 1

You can use attached behavior pattern

public class Behaviors
{
    public static readonly DependencyProperty SelectTextOnFocusProperty = DependencyProperty
        .RegisterAttached("SelectTextOnFocus", typeof(bool), typeof(Behaviors), new FrameworkPropertyMetadata(false, GotFocus));

    public static void SetSelectTextOnFocus(DependencyObject obj, bool value)
    {
        obj.SetValue(SelectTextOnFocusProperty, value);
    }

    private static void GotFocus(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var textbox = d as TextBox;

        if (null == textbox) return;

        textbox.GotKeyboardFocus += SelectTextOnFocus;
        textbox.GotMouseCapture += SelectTextOnFocus;
    }

    private static void SelectTextOnFocus(object sender, RoutedEventArgs e)
    {
        if (!(sender is TextBox)) return;
        ((TextBox)sender).SelectAll();
    }
}

in your xaml only need

xmlns:my="clr-namespace:Namespace;assembly=Rkmax"

use you can use in a TextBox like

all this work for mouse and keyboard event