在WPF文本框上模拟键盘事件

问题: 文本框上未发生任何操作。

代码:

void buttonElement_Click(object sender, RoutedEventArgs e)
    {
        // create variable for holding string
        String sendString = "";           
            // stop all event handling
            e.Handled = true;

            // set sendstring to key
            sendString = ((Button)sender).CommandParameter.ToString();                              

            // if something to send
            if (!String.IsNullOrEmpty(sendString))
            {
                // if sending a string
                if (sendString.Length > 1)
                {
                    // add {}
                    sendString = "{" + sendString + "}";
                }

                    // set keyboard focus
                System.Windows.Input.Keyboard.Focus(this.txtSearch);                                                         
               System.Windows.Forms.SendKeys.SendWait(sendString);

            }           
    }

吉莎。