c# - WPF TextBox 在 Tab 焦点上全选

Question

当使用 Tab 键完成焦点时，我正在尝试选择所有文本。但我无法找到正确的解决方案。现在我正在使用 GotFocusEvent 但现在当我用鼠标单击时它会引发事件。

我现在使用的代码是:

EventManager.RegisterClassHandler(typeof(System.Windows.Controls.TextBox), System.Windows.Controls.TextBox.GotKeyboardFocusEvent, new RoutedEventHandler(SelectAllText));


void SelectAllText(object sender, RoutedEventArgs e)
{
    var textBox = sender as System.Windows.Controls.TextBox;
    if (textBox != null)
        if (!textBox.IsReadOnly)
            textBox.SelectAll();
}

Answer 1

引用这个答案

Textbox SelectAll on tab but not mouse click

您可以修改为...

EventManager.RegisterClassHandler(typeof(System.Windows.Controls.TextBox), System.Windows.Controls.TextBox.GotKeyboardFocusEvent, new KeyboardFocusChangedEventHandler(OnGotKeyboardFocus));

void OnGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
    var textBox = sender as System.Windows.Controls.TextBox;

    if (textBox != null && !textBox.IsReadOnly && e.KeyboardDevice.IsKeyDown(Key.Tab))
        textBox.SelectAll();
}

您还应该注意有关在 LostKeyboardFocus 上清除选择的详细信息