判断数组里是否出现重复的值，简单判断

   ![图片说明](https://img-ask.csdn.net/upload/201607/10/1468165484_842681.jpg)
        比如说点击小王后面的选择按钮，已选择工程师的label里出现“小王，”再点击小赵后面的按钮，label显示“小王，小赵，”。现在就是如果再点击小王，label显示“小王，小赵，小王”，能不能做个判断，如果已经选过的名字，就会提示:该人已被选择。下面是我原来的代码

        protected void lbtn_Command(object sender, CommandEventArgs e)  //在gridview里选择工程师
    {
        var StaffName = e.CommandName;               //选择的那个工程师赋值为StaffName
        Session["engineer1"] += "'" + StaffName + "'" + "+','+";         //将多次选择的工程师合并起来
        Session["engineer2"] += "'''" + StaffName + "'''" + "+','+";

            this.lblEngineer.Text += StaffName + ",";   //label里显示的就是多次选择的工程师          
    }

 if (!this.lblEngineer.Text.Contains(StaffName + ","))
this.lblEngineer.Text += StaffName + ",";

protected void lbtn_Command(object sender, CommandEventArgs e) //在gridview里选择工程师
{
var StaffName = e.CommandName; //选择的那个工程师赋值为StaffName
Session["engineer1"] += "'" + StaffName + "'" + "+','+"; //将多次选择的工程师合并起来
Session["engineer2"] += "'''" + StaffName + "'''" + "+','+";
if (!this.lblEngineer.Text.Contains(StaffName + ",")) //满足条件是未出现过
this.lblEngineer.Text += StaffName + ","; //label里显示的就是多次选择的工程师

}