添加语音播报

项目添加下面的引用

public void tips(Label label)
        {
            SpeechSynthesizer s = new SpeechSynthesizer();//实例化
            s.SpeakAsync(label4.Text);//播放的文本内容等于label4.text的内容
            s.Pause();//暂停已开始的对象
            s.Resume(); //恢复暂停后的对象
            s.Rate = 0;//朗读频率
            s.Volume = 100;//朗读音量  
        }

 private void timer1_Tick(object sender, EventArgs e)
        {
            timer1.Enabled = true;
            timer1.Interval = 5000; //5秒
            Facade.OrderListFaçade orderfacade = new Facade.OrderListFaçade();
            Entity.T_OrderList order = new Entity.T_OrderList();
            order.IsEnd = "未支付";
            //未支付记录大于1条开始播报
            List<Entity.T_OrderList> orderlist = orderfacade.selectIsEnd(order);
            if (orderlist.Count >= 1)
            {
                tips(label4);
                this.panel2.Left -= 5;  //向右移动3个像素
                if (this.panel2.Right < 0)
                {
                    this.panel2.Left = this.Width;   //panel控件左位置为当前控件宽度
                }
            }
        }