ashx文件中使用session提示“未将对象引用设置到对象的实例”

代码

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Web;
using  System.Data;
using System.Web.SessionState;

namespace  friends {
     ///   <summary>
     ///  Handler 的摘要说明
     ///   </summary>
     public   class  Handler : IHttpHandler,  IRequiresSessionState  {

         public   void  ProcessRequest(HttpContext context) {
            context.Response.ContentType  =   " text/plain " ;


···

 

 

System.Web.SessionState.IReadOnlySessionState 为只读会话的接口

System.Web.SessionState.IRequiresSessionState 为可读可写的