WPF中TextBox控件對於鼠標單擊獲取焦點后的全選

void OnLostFocus(object sender, RoutedEventArgs e)
        {
            TextBox tb = e.Source as TextBox;
            tb.PreviewMouseDown += new MouseButtonEventHandler(OnPreviewMouseDown);
        }

        void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            TextBox tb = e.Source as TextBox;
            tb.Focus();
            e.Handled = true;
        }

        void OnGotFocus(object sender, RoutedEventArgs e)
        {
            TextBox tb = e.Source as TextBox;
            tb.SelectAll();
            tb.PreviewMouseDown -= new MouseButtonEventHandler(OnPreviewMouseDown);
        }

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

　　關鍵點在於鼠標按下之時

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

由這里引發GotFocus事件 並且設置Handled 標記阻止路由事件繼續傳播

在GotFocus的事件里面利用tb.SelectAll()全選

tb.PreviewMouseDown -= new MouseButtonEventHandler(OnPreviewMouseDown);

所實現的功能是當第二次單擊的時候，不再是全選文字，而是顯示光標。

 

第一次發博文，歡迎指正。