2 페이지를 연결하기 위해 값 id를 보내려고합니다. 검색 페이지에 설명 페이지가 있습니다. 여기 asp.net mobile 2.0
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code
Exception Details:System.NullReferenceException :Object reference not set to an instance of an object
Source Error:
Line 101:
Line 102: ListComment.DataSource = comm;
Line 103: ListComment.DataBind();
Line 104:
Line 105: }
는 코멘트 페이지 내 코드입니다 :
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Comment.aspx.cs" Inherits="Comment" Debug="true"%>
<%@ Register TagPrefix="mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile"%>
<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
<mobile:Form id="Form1" runat="server" BackColor="#fcf9f3" Paginate="True">
<mobile:Label ID="CommentError" Runat="server" ForeColor="red"
Font-Size="Small" Font-Bold="True" Visible="false" />
<mobile:Label ID="Label2" Runat="server" ForeColor="#d3af63" Font-Italic="True"
Font-Name="Monotype Covasia" Font-Bold="True" text="Write Comments" />
<mobile:Label ID="lblCommentTitle" Runat="server" text="Title" />
<mobile:TextBox ID="txtCommentTitle" Runat="server" text="" />
<br />
<mobile:Label ID="lblCommentText" Runat="server" text="Comment" />
<mobile:TextBox ID="txtCommentText" Runat="server" text=""/>
<br />
<mobile:Command ID="submit" Runat="server" text="Submit" OnClick="submitform_Click" />
<br />
<mobile:Label ID="Label1" Runat="server" ForeColor="#d3af63" Font-Italic="True"
Font-Name="Monotype Covasia" Font-Bold="True" text="Read Comments"/>
<mobile:list runat="server" id="ListComment" DataTextfield="comment_text"
DataValueField="comment_text" Font-Size="Small" Font-Italic="True"
ItemsPerPage="5" Wrapping="Wrap" BreakAfter="True"/>
</mobile:Form>
</body>
</html>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.Mobile;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.MobileControls;
using System.Data.Linq;
using System.Xml.Linq;
using System.Linq;
public partial class Comment : System.Web.UI.MobileControls.MobilePage
{
CommentDataContext Comments = new CommentDataContext();
protected void Page_Load(object sender, EventArgs e)
{
if (Session["error_msg"] != null)
{
CommentError.Text = Session["error_msg"].ToString();
Session["error_msg"] = null;
CommentError.Visible = true;
}
if (Session["r_id"] != null)
{
String r_id = Session["r_id"].ToString();
}
GetComment();
}
protected void submitform_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
AddComment();
}
}
#region Inserting a comment
protected void AddComment()
{
mobile_comment mobilecon = new mobile_comment();
mobilecon.comment_text = txtCommentText.Text;
mobilecon.comment_title = txtCommentTitle.Text;
Comments.mobile_comments.InsertOnSubmit(mobilecon);
Comments.SubmitChanges();
Session["error_msg"] = "Your comment has been added";
Response.Redirect("Comment.aspx");
}
#endregion
protected void GetComment()
{
var comm = from c in Comments.mobile_comments
where c.r_id == Int32.Parse(Session["r_id"].ToString())
//where c.r_id == Int32.Parse(Request["r_id"].ToString())
select c;
ListComment.DataSource = comm;
ListComment.DataBind();
}
}
내가 제대로 을이 문을 사용하고 어디에 c.r_id ==에서 Int32.Parse
이 오류가 내가 얻을 수있다 (세션 [ "r_id"]. ToString())
그렇다면 ID를 어떻게 연결합니까? 이 방법으로 문제가있는 경우