让textbox获焦、失焦事件，获焦时,其text被选中

一：让textbox获焦、失焦事件： 

textBox1.LostFocus += new RoutedEventHandler(textBox1_LostFocus);//获焦点是GotFocus
textBox2.GotKeyboardFocus += new KeyboardFocusChangedEventHandler(textBox2_GotKeyboardFocus);//仅键盘操作的失焦的事件，有下面的例子中有用到

二：键盘操作获焦时,其中text被全选中：

１.写个附加属性，然后就可以在Style里面用了

 public class TextBoxHelper
    {
        public static readonly DependencyProperty AutoSelectAllProperty =
            DependencyProperty.RegisterAttached("AutoSelectAll", typeof(bool), typeof(TextBoxHelper),
                new FrameworkPropertyMetadata((bool)false,
                    new PropertyChangedCallback(OnAutoSelectAllChanged)));

        public static bool GetAutoSelectAll(TextBoxBase d)
        {
            return (bool)d.GetValue(AutoSelectAllProperty);
        }

        public static void SetAutoSelectAll(TextBoxBase d, bool value)
        {
            d.SetValue(AutoSelectAllProperty, value);
        }

        private static void OnAutoSelectAllChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var textBox = d as TextBoxBase;
            if (textBox != null)
            {
                var flag = (bool)e.NewValue;
                if (flag)
                {
                    textBox.GotFocus += TextBoxOnGotFocus;
                }
                else
                {
                    textBox.GotFocus -= TextBoxOnGotFocus;
                }
            }
        }

        private static void TextBoxOnGotFocus(object sender, RoutedEventArgs e)
        {
            var textBox = sender as TextBoxBase;
            if (textBox != null)
            {
                textBox.SelectAll();
            }
        }
    }

然后在Style里面
<Setter Property="local:TextBoxHelper.AutoSelectAll" Value="True"/>
local是你引用的命名空间