WPF控制PasswordBox获取焦点后光标的位置

 1         private void PasswordPb_GotFocus(object sender, RoutedEventArgs e)
 2         {
 3             //SetSelection(PasswordPb, 0, 0);//焦点置于最前
 4             SetSelection(PasswordPb, PasswordPb.Password.Length, 0);//焦点置于最后
 5             //SetSelection(PasswordPb, 0, PasswordPb.Password.Length);//选中全部密码
 6         }
 7 
 8         private void SetSelection(PasswordBox passwordBox, int start, int length)
 9         {
10             passwordBox.GetType()
11                        .GetMethod("Select", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic)
12                        .Invoke(passwordBox, new object[] { start, length });
13         }