c# - 嵌套数据列表的问题

Question

我在 DataList1 中有一个嵌套的 DataList 结构 DataList2，其中我在 DataList2 中有两个 Buttons 执行某些操作命令。

我想调用一个过程，它将 DataList1 的 datakeyfield 和 DataList2 的 datakeyfield 作为输入。但是，读取 DataList2 的 datakeyfield 时出现问题。这是我的代码:

.aspx.cs代码

protected void DataList2_ItemCommand(object source, DataListCommandEventArgs e)
{
    if ((e.CommandName == "accept") && (e.CommandArgument != null))
    {
        string connStr = ConfigurationManager.ConnectionStrings["MyDbConn"].ToString();
        SqlConnection conn = new SqlConnection(connStr);
        int team_ID = (int)DataList1.DataKeys[e.Item.ItemIndex];
        SqlCommand cmd = new SqlCommand("accept_member", conn);
        string member = (string)DataList2.DataKeys[e.Item.ItemIndex];
        cmd.CommandType = CommandType.StoredProcedure;
        string email = Session["email"].ToString();
        int course_ID = Convert.ToInt32(Request.QueryString["courseID"]);
        cmd.Parameters.Add(new SqlParameter("@course_ID", course_ID));
        cmd.Parameters.Add(new SqlParameter("@team_ID", team_ID));
        cmd.Parameters.Add(new SqlParameter("@myemail", email));
        cmd.Parameters.Add(new SqlParameter("@member", member));
        cmd.Parameters.Add(new SqlParameter("@respond", 1));
        SqlParameter count = cmd.Parameters.Add("@count", SqlDbType.Int);
        count.Direction = ParameterDirection.Output;

        conn.Open();
        cmd.ExecuteNonQuery();

        if (@count.Value.ToString().Equals("1"))
        {
            Response.Write(@member + " " + "joined your team");

        }
        else
        {
            Response.Write("team is full or not found");
        }
    }
    else if ((e.CommandName == "reject") && (e.CommandArgument != null))
    {
        int team_ID = (int)DataList1.DataKeys[e.Item.ItemIndex];
        string connStr = ConfigurationManager.ConnectionStrings["MyDbConn"].ToString();
        SqlConnection conn = new SqlConnection(connStr);
        string member = (string)DataList2.DataKeys[e.Item.ItemIndex];
        SqlCommand cmd = new SqlCommand("accept_member", conn);
        cmd.CommandType = CommandType.StoredProcedure;
        string email = Session["email"].ToString();
        int course_ID = Convert.ToInt32(Request.QueryString["courseID"]);
        cmd.Parameters.Add(new SqlParameter("@course_ID", course_ID));
        cmd.Parameters.Add(new SqlParameter("@team_ID", team_ID));
        cmd.Parameters.Add(new SqlParameter("@myemail", email));
        cmd.Parameters.Add(new SqlParameter("@member", member));
        cmd.Parameters.Add(new SqlParameter("@respond", "0"));
        SqlParameter count = cmd.Parameters.Add("@count", SqlDbType.Int);
        count.Direction = ParameterDirection.Output;

        conn.Open();
        cmd.ExecuteNonQuery();

        if (@count.Value.ToString().Equals("1"))
        {
            Response.Write(@member + " " + "has been rejected");
        }
        else
        {
            Response.Write("team is full or not found");
        }
    }

    DataList2.DataBind();
}

错误

The name "DataList2" does not exist in the current context

Answer 1

假设你的数据在DataList1中产生不止一行，那么DataList2就不止一个。因此，ASP.NET 不会使 DataList2 成为页面(代码隐藏)类的成员。

幸运的是，在这种情况下，发送者(你称之为源，同样的东西)应该是你想要的 DataList2。尝试将其转换为 DataList，看看会发生什么。