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2ページを接続するために値IDを送信しようとしています。コメントページの検索ページ。asp.net mobile 2.0
これは私が取得エラーです：
<%@ 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();
}
}
私が正しく、この文を使用しています c.r_id ==でInt32.Parse：ここ
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: }
はコメントページのための私のコードです（Session ["r_id"]。ToString（））
もしそうでなければ、どのようにidをリンクしますか？これはあなたの問題であれば