单击时选择 TextBox 的所有内容 [英] Selecting all contents of TextBox on clicking it

问题描述

我有一个文本框.单击它时，应选择 TextBox 的所有内容.解决这个问题的方法是什么?我试过的代码是:

I have one TextBox. On clicking it, all the contents of the TextBox should be selected. What is the solution for this? The code I have tried is:

<TextBox Name="questionTitle_textBox" Text="Question title" PreviewMouseDown="questionTitle_textBox_PreviewMouseDown"/>

函数questionTitle_textBox_PreviewMouseDown定义为

private void questionTitle_textBox_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
        questionTitle_textBox.SelectAll();
}

推荐答案

这个有效

<TextBox Name="questionTitle_textBox" Text="Question title" GotFocus="questionTitle_textBox_GotFocus" PreviewMouseLeftButtonDown="questionTitle_textBox_PreviewMouseLeftButtonDown"/>

和后面的代码

private void questionTitle_textBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    TextBox tb = (sender as TextBox);
    if (tb != null)
    {
        if (!tb.IsFocused)
        {
            e.Handled = true;
            tb.Focus();
        }
    }
}

private void questionTitle_textBox_GotFocus(object sender, RoutedEventArgs e)
{
    TextBox tb = (sender as TextBox);
    if (tb != null)
    {
        tb.SelectAll();
    }
}

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