谁能帮我看看这个问题出在哪

Question

string tableName = RadioButtonList1.SelectedValue;
        string view = Calendar1.SelectedDate.ToString("yyyy-MM-dd");
        string[] sqlstr = new string[2];
        sqlstr[0] = "select top 1 * from z_" + tableName + " where dataday between cast((convert(varchar(10),dateadd(day,0,'" + view + "'),120) + ' 1:00') as datetime) and cast((convert(varchar(10),'" + view + "',120) + ' 1:59') as datetime) order by dataday ASC";
        sqlstr[1] = "select top 1 * from z_" + tableName + " where dataday between cast((convert(varchar(10),dateadd(day,0,'" + view + "'),120) + ' 2:00') as datetime) and cast((convert(varchar(10),'" + view + "',120) + ' 2:59') as datetime) order by dataday ASC";
        conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["key"]);
        conn.Open();
        for (int i = 0; i < 2; i++)
        {
           
            SqlDataAdapter p = new SqlDataAdapter(sqlstr[i], conn);
            DataSet ds = new DataSet();
            p.Fill(ds);
            string G = "GridView" + i.ToString();
            GridView dv = this.form1.FindControl(G) as GridView;
            dv.DataSource = ds;
            dv.DataBind();
           
        }
        conn.Close();

未将对象引用设置到对象的实例。

说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。

源错误:

行 33: string G = "GridView" + i.ToString(); 行 34: GridView dv = this.form1.FindControl(G) as GridView; 行 35: dv.DataSource = ds; 行 36: dv.DataBind(); 行 37: conn.Close();

源文件: c:\Inetpub\wwwroot\water\e_day.aspx.cs    行: 35

Answer 1

GridView dv = this.form1.FindControl(G) as GridView;
dv=null了也就是G在form1中不存在

Answer 2

那我已经把GRIDVIEW放在FROM1里了！

Answer 3

谢谢大哥，问题找到了！是我少加了一个GRIDVIEW控件！

Answer 4

如果你的ds不是null，那么请你把调用栈的信息发上来，看看是不是调用栈里面某个函数出现null变量调用了。