如何在WPF文本框中自动选择焦点上的所有文本?

如果我从GotFocus事件处理程序中调用SelectAll，它对鼠标不起作用——鼠标一释放，选择就消失了。

编辑:人们喜欢唐纳利的回答，我将试着解释为什么我不像公认的答案那样喜欢它。

It is more complex, while the accepted answer does the same thing in a simpler way. The usability of accepted answer is better. When you click in the middle of the text, text gets unselected when you release the mouse allowing you to start editing instantly, and if you still want to select all, just press the button again and this time it will not unselect on release. Following Donelle's recipe, if I click in the middle of text, I have to click second time to be able to edit. If I click somewhere within the text versus outside of the text, this most probably means I want to start editing instead of overwriting everything.

当前回答

我搜索了很多解决方案，我发现了两个解决方案选择但是，问题是，当我们做右键单击，并从文本框选择部分文本后进行剪切/复制，它选择了所有甚至我选择了部分文本。解决办法就在这里。只需在键盘选择事件中添加以下代码。这对我很管用。

private static void SelectContentsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    if (d is TextBox)
    {
        TextBox textBox = d as TextBox;
        if ((e.NewValue as bool?).GetValueOrDefault(false))
        {
            textBox.GotKeyboardFocus += OnKeyboardFocusSelectText;                 
        }
        else
        {
            textBox.GotKeyboardFocus -= OnKeyboardFocusSelectText;

        }
    }
}


private static void OnKeyboardFocusSelectText(object sender, KeyboardFocusChangedEventArgs e)
{
    if (e.KeyboardDevice.IsKeyDown(Key.Tab))
        ((TextBox)sender).SelectAll();
}

2017-01-23 19:38:43

其他回答

我使用这个代码

  private void txtNav_GotFocus(object sender, RoutedEventArgs e)
            {
                e.Handled = true;
                var c = new DispatcherTimer();
                c.Interval = TimeSpan.FromMilliseconds(100);
                c.Tick += (a1, a2) =>
                {
                    c.IsEnabled = false;
                    txtNav.SelectAll();
                };
                c.IsEnabled = true;
    
            }

2021-03-09 22:41:05

在谷歌搜索和测试之后，我找到了一个简单的解决方案。

你需要在容器窗口的Loaded事件中添加一个事件处理程序:

private void yourwindow_Loaded(object sender, RoutedEventArgs e)
{
    EventManager.RegisterClassHandler(typeof(TextBox),
        TextBox.PreviewMouseLeftButtonDownEvent,
        new RoutedEventHandler(SelectivelyIgnoreMouseButton));
}

接下来，你必须创建之前代码中引用的RoutedEventHandler的处理程序:

private void SelectivelyIgnoreMouseButton(object sender, RoutedEventArgs e)
{
    TextBox tb = (sender as TextBox);
    if (tb != null)
    {
        if (!tb.IsKeyboardFocusWithin)
        {
            e.Handled = true;
            tb.Focus();
        }
    }
}

现在，你可以单独将GotFocus事件处理程序上的SelectAll()命令添加到任何TextBox控件:

private void myTextBox_GotFocus(object sender, RoutedEventArgs e)
{
    (sender as TextBox).SelectAll();
}

您的文本现在被选中对焦!

改编自博士WPF解决方案，MSDN论坛

2017-06-02 00:30:47

如果有一个事件，取消选择的文本在OnFocus鼠标向上，我通常只是延迟全部选择。

private void TextBox_GotFocus(object sender, RoutedEventArgs e)
{
    if (TextBox.Text != null)
    {
        _ = Task.Run(() =>
        {
            Dispatcher.Invoke(
                async () => {
                    await Task.Delay(100);
                    TextBox.SelectAll();
                }
            );
        });
    }
}

2020-03-02 02:12:57

这似乎对我有用……

private bool TextBoxFocusBool;

private void TextBox_GotFocus(object sender, RoutedEventArgs e)
{
    TextBoxFocusBool = true;
}

private void TextBox_LostMouseCapture(object sender, MouseEventArgs e)
{
    if (TextBox.SelectionLength == 0 & TextBoxFocusBool == true)
    {
        TextBox.SelectAll();
        TextBoxFocusBool = false;
    }
}

private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
    TextBoxFocusBool = true;
}

2022-09-04 04:16:49

最简单和完美的解决方案，是在文本框获得焦点后使用计时器选择所有文本20ms:

Dim WithEvents Timer作为新的DispatcherTimer()

设置间隔: 计时器。Interval = timspan . frommilliseconds (20)

响应事件(我在这里继承了TextBox控件，所以我重写了它的事件:

Protected Overrides Sub OnGotFocus(e As RoutedEventArgs)
        Timer.Start()
        MyBase.OnGotFocus(e)
    End Sub


    Private Sub Timer_Tick(sender As Object, e As EventArgs) Handles Timer.Tick
        Timer.Stop()
        Me.SelectAll()
    End Sub

这就是全部!

2020-09-14 00:27:31

如何在WPF文本框中自动选择焦点上的所有文本?

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