解决ashx文件下的Session“未将对象引用设置到对象的实例”
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using PPT_DAL; 6 namespace PPT_Web.tool 7 { 8 /// <summary> 9 /// Login 的摘要说明 10 /// </summary> 11 public class Login : IHttpHandler 12 { 13 14 public void ProcessRequest(HttpContext context) 15 { 16 context.Response.ContentType = "text/html"; 17 string lo_usm = context.Request.Params["lo_usm"]; 18 string lo_pwd = context.Request.Params["lo_pwd"]; 19 UserEntity userModel = PPT_BLL.UserManager.Login(lo_usm,lo_pwd); 20 if (userModel != null) 21 { 22 context.Session["UserId"] = userModel.USR_ID; 23 context.Response.Write("{'result':'1'}"); 24 } 25 else 26 { 27 context.Response.Write("{'result':'0'}"); 28 } 29 } 30 31 public bool IsReusable 32 { 33 get 34 { 35 return false; 36 } 37 } 38 } 39 }
问题：
如题所示，在一般处理程序文件，即ashx文件下调用Session["UserId"],当调试的时候会显示“未将对象实例化的”的错误
解决方法：
将该类实现“IRequiresSessionState”的接口即可，而此接口在System.Web.SessionState命名空间下，所以要在上面添加一句：using System.Web.SessionState;
最终实现代码如下：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 using PPT_DAL; 6 using System.Web.SessionState; 7 namespace PPT_Web.tool 8 { 9 /// <summary> 10 /// Login 的摘要说明 11 /// </summary> 12 public class Login : IHttpHandler, IRequiresSessionState 13 { 14 15 public void ProcessRequest(HttpContext context) 16 { 17 context.Response.ContentType = "text/html"; 18 string lo_usm = context.Request.Params["lo_usm"]; 19 string lo_pwd = context.Request.Params["lo_pwd"]; 20 UserEntity userModel = PPT_BLL.UserManager.Login(lo_usm,lo_pwd); 21 if (userModel != null) 22 { 23 context.Session["UserId"] = userModel.USR_ID; 24 context.Response.Write("{'result':'1'}"); 25 } 26 else 27 { 28 context.Response.Write("{'result':'0'}"); 29 } 30 } 31 32 public bool IsReusable 33 { 34 get 35 { 36 return false; 37 } 38 } 39 } 40 }
