修改显示乱码bug

codegit/CallCenterApi/CallCenterApi.Interface/CallCenterApi.Interface/Global.asax.cs

-using CallCenterApi.Common;
+using CallCenter.Utility;
+using CallCenterApi.Common;
 using CallCenterApi.Interface.Models.Common;
 using System;
 using System.Collections.Generic;
                 var date = DateTime.Parse(Configs.GetValue("AuthDate"));
                 if (date < DateTime.Now)
                 {
+					context.Response.ContentType = "text/plain; charset=utf-8";
                     context.Response.Write(new AjaxResult { state = ResultTypes.error.ToString(), message = "授权过期，请联系系统厂家。" }.ToJson());
                     context.Response.End();
                 }