通过单击按钮在文本框中选择全部

Question

I would like to highlight all content of a TextBox by a press of a button, but it doesn't work.

private void selectAll_Click(object sender, RoutedEventArgs e)
{
    myTextBox.SelectAll();
}

I tried this as well:

myTextBox.SelectionStart = 0;
myTextBox.SelectionLength = myTextBox.Text.Length;

Not working. The properties seem to change, but the highlight is not present on the UI. If I select the text manually, the highlight works correctly.

What should I do?

Answer 1

添加它，您将看到UI刷新：

myTextBox.Focus();