获取错误“对象引用未设置为objest的实例 [英] getting error "object refrence not set to an instance of an objest

问题描述

执行网页时出现错误。



PLZ建议我解决一下我的问题

提前感谢。

error ocured while executing webpage.

plz suggest me some idea to solve my problem
thanks in advance.

DataBaseClass dbClass = new DataBaseClass();
       public DataTable dt;
       protected void Page_Load(object sender, EventArgs e)
       {
           if (!Page.IsPostBack)
           {
               GetUserScraps(int.Parse(Request.QueryString["id"].ToString()));//here i''ve met error..

           }
       }

       public void GetUserScraps(int id)
       {
           string getUserScraps = "SELECT r.uid ,r.unm,p.photo,s.uid,s.unm,s.text,s.date,s.sid FROM register as r, status as s, profile as p WHERE   p.pid.s.sid AND r.email=p.email AND s.unm=''" + Request.QueryString["id"].ToString() + "''";
           dt = dbClass.ConnectDataBaseReturnDT(getUserScraps);
           if (dt.Rows.Count > 0)
           {
               GridViewUserScraps.DataSource = dt;
               GridViewUserScraps.DataBind();
           }
       }

推荐答案

它看起来像 Request.QueryString [id] 返回 null 。也许，网址中没有 id 值。

It seeme like Request.QueryString["id"] returns null. Maybe, there is no id value in the url.

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