c#后台一般处理程序中把变量的值拼成json格式字符串

                //一般处理程序代码string login_name = context.Request["login_name"].Trim();                BLLS data = new BLLS();                string select_id = "select use_id from sq_sgxhcom.fru_users where use_name=@p0";                int use_id = Convert.ToInt32(data.Select(select_id, login_name).Tables[0].Rows[0][0]);                string aa = "select use_name,use_realname from sq_sgxhcom.fru_users where use_id=@p0";                string name = data.Select(aa, use_id).Tables[0].Rows[0][0].ToString();                string realname = data.Select(aa, use_id).Tables[0].Rows[0][1].ToString();                string ccc = "select use_name,use_realname from sq_sgxhcom.fru_users where use_id=8";                string name1 = data.Select(ccc).Tables[0].Rows[0][0].ToString();                string realname1 = data.Select(aa, use_id).Tables[0].Rows[0][1].ToString();                string aaa = " [<K>\"name\":\"{0}\",\"realname\":\"{1}\"</K>,<K>\"name\":\"{2}\",\"realname\":\"{3}\"</K>]";//将数据拼成json字符串格式                returnstr = string.Format(aaa, name, realname,name1,realname1).Replace("<K>", "{").Replace("</K>","}");                context.Response.Write(returnstr);

//js代码$.Ajax({         type: "post",         url: "ajax/staff_manag.ashx?type=obtain_count",         data: {             login_type: login_type,             login_name: login_name         },         async: true,         dataType: "json",         success: function fun(json) {             alert("我是"+json[0].name+"和"+json[1].name+"是好朋友");         }     });