从代码隐藏中聚焦时如何选择 WPF TextBox 中的所有文本？
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How to select all text in a WPF TextBox when focused from codebehind?
提问by Marc
I would like to set the focus of a WPF TextBoxfrom codebehind (not the TextBox's codebehind, but some parent control) and select all text in the TextBoxfrom the TextBoxs codebehind when it receives that focus.
我想TextBox从代码隐藏（不是代码TextBox隐藏，而是一些父控件）设置 WPF 的焦点，并在收到焦点时TextBox从TextBoxs 代码隐藏中选择所有文本。
I focus the TextBoxlike this:
我的重点是TextBox这样的：
var scope = FocusManager.GetFocusScope(txt);
FocusManager.SetFocusedElement(scope, txt);
and listen to the event in the TextBoxlike this in the TextBoxs codebehind:
并TextBox在TextBoxs 代码隐藏中以这样的方式收听事件：
AddHandler(GotFocusEvent, new RoutedEventHandler(SelectAllText), true);
and try to select the text like this:
并尝试选择这样的文本：
private static void SelectAllText(object sender, RoutedEventArgs e)
{
var textBox = e.OriginalSource as TextBox;
if (textBox != null)
textBox.SelectAll();
}
But the text doesn't get selected. How can I modify this to work as I'd like it to?
但是文本没有被选中。我怎样才能修改它以按照我的意愿工作？
回答by sa_ddam213
You will have to set Keyboardfocus on the TextBoxbefore selecting the text
在选择文本之前，您必须将Keyboard焦点设置在TextBox
Example:
例子：
private static void SelectAllText(object sender, RoutedEventArgs e)
{
var textBox = e.OriginalSource as TextBox;
if (textBox != null)
{
Keyboard.Focus(textBox);
textBox.SelectAll();
}
}
