WPF中TextBox控件对于鼠标单击获取焦点后的全选

 1 void OnLostFocus(object sender, RoutedEventArgs e)
 2         {
 3             TextBox tb = e.Source as TextBox;
 4             tb.PreviewMouseDown += new MouseButtonEventHandler(OnPreviewMouseDown);
 5         }
 6 
 7         void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
 8         {
 9             TextBox tb = e.Source as TextBox;
10             tb.Focus();
11             e.Handled = true;
12         }
13 
14         void OnGotFocus(object sender, RoutedEventArgs e)
15         {
16             TextBox tb = e.Source as TextBox;
17             tb.SelectAll();
18             tb.PreviewMouseDown -= new MouseButtonEventHandler(OnPreviewMouseDown);
19         }

<TextBox Name="searchTextBox" Background="DarkOrange" HorizontalAlignment="Stretch" MaxLength="15" TextAlignment ="Center" 
     TextChanged="OnSearchTextChange" GotFocus="OnGotFocus" PreviewMouseDown="OnPreviewMouseDown" LostFocus="OnLostFocus">
     输入名称搜索
</TextBox>

　　关键点在于鼠标按下之时

tb.Focus();
e.Handled = true;

由这里引发GotFocus事件并且设置Handled 标记阻止路由事件继续传播

在GotFocus的事件里面利用tb.SelectAll()全选

tb.PreviewMouseDown -= new MouseButtonEventHandler(OnPreviewMouseDown);

所实现的功能是当第二次单击的时候，不再是全选文字，而是显示光标。

第一次发博文，欢迎指正。