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ASP.net C# Bind a Yahoo RSS Feed to a Gridview

Posted on 2008-10-18
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2,142 Views
Last Modified: 2013-12-17
Hi,
I am trying to get code to read from RSS Feed to a GridView in ASP.Net C#
I have the c# code in App_Code folder CodeCS and VB code in App_Code folder CodeVB
and referenced the folders in Web.config as follows:
<codeSubDirectories><add directoryName="VBCode"/><add directoryName="CSCode"/>
I am getting the following errors:

Error      20      An object reference is required for the non-static field, method, or property
'System.Web.UI.WebControls.BaseDataBoundControl.DataSource.get'      
C:\Projects\Web\AssetAllocation\App_Code\CodeCS\FeedRss.aspx.cs
Line17       Column 9      GridView.DataSource = GetDataSet().Tables[3];

Error      21      An object reference is required for the non-static field, method, or property
'System.Web.UI.Control.DataBind()'      C:\Projects\Web\AssetAllocation\App_Code\CodeCS\FeedRss.aspx.cs
Line18       Column 9      GridView.DataBind();

Error      22      An object reference is required for the non-static field, method, or property
'System.Web.UI.WebControls.DataBoundControl.DataMember.get'      
C:\Projects\Web\AssetAllocation\App_Code\CodeCS\FeedRss.aspx.cs      25
Line 25      Column 9      GridView.DataMember = "item";

Error      23      An object reference is required for the non-static field, method, or property
'System.Web.UI.WebControls.BaseDataBoundControl.DataSource.get'      
C:\Projects\Web\AssetAllocation\App_Code\CodeCS\FeedRss.aspx.cs
Line 26      Column 9      GridView.DataSource = ds;

Error      21      'System.Web.UI.Page' does not contain a definition for 'DataItem'
and no extension method 'DataItem' accepting a first argument of type 'System.Web.UI.Page'
could be found (are you missing a using directive or an assembly reference?)      
c:\Projects\Web\AssetAllocation\FeedRssCS.aspx
Line 26      Column 37      DataItem
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
public partial class rssCS : System.Web.UI.Page
{
 
    protected void Page_Load(object sender, EventArgs e)
    {
        GridView.DataSource = GetDataSet().Tables[3];
        GridView.DataBind();
    }
    private DataSet GetDataSet()
        
    {
        DataSet ds = new DataSet("rsRSS");
        ds.ReadXml("http://rss.news.yahoo.com/rss/mostviewed");
        GridView.DataMember = "item";
        GridView.DataSource = ds;
        //GridView1.DataBind();
        return ds;
    }
 
 
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        GridViewRow row = e.Row;
        DateTime CurrTime = DateTime.Now.Date;
 
        if (row.RowIndex >= 0) // Start looping on the first row
            if (row.RowType == DataControlRowType.DataRow)
            {
                row.Cells[0].Text = row.Cells[0].Text;
                row.Cells[1].Text = row.Cells[1].Text;
            }
 
        }
 
 
}
 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="~/App_Code/CodeCS/FeedRss.aspx.cs" Inherits="rssCS" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Web.Configuration" %>
<%@ Import Namespace="System.Collections" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Linq" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Web.UI" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>FeedRss</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:GridView
        id="GridView"
        DataSourceId="srcMovies"
        Runat="server" />
        <ItemTemplate>
        <asp:HyperLink ID="HyperLink1" NavigateUrl=<%#DataBinder.Eval(Container.DataItem,"link") %> 
        runat="server">
        <%#DataBinder.Eval(Container.DataItem,"title") %>
        </asp:HyperLink>
        </ItemTemplate>
        </asp:GridView>
<!--
     See TextFile.txt
-->
    <asp:SqlDataSource
        id="srcMovies"
        ConnectionString="Data Source=.\SQLExpress;
            AttachDbFilename=|DataDirectory|MyDatabase.mdf;
            Integrated Security=True;User Instance=True"
        SelectCommand="SELECT * FROM Movies"
        Runat="server" />
    </div>
    </form>
</body>
</html>

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Comment
Question by:homeshopper
3 Comments
 
LVL 26

Accepted Solution

by:
Anurag Thakur earned 500 total points
ID: 22755083
why are you trying to give 2 datasources to the grid view
one datasource is when you load the grid view and is using u r local database
the second one is the dataset which you prepare from the rss feed

just try to provide only one datasource for your gridview and i think it should work fine

one more thing i noticed
GridView.DataMember = "item"; in the function GetDataSet()
you even dont need this line if you are specifying your columns in the grid view definition
0
 

Author Comment

by:homeshopper
ID: 22761271
Hi ragi0017,
Sorry not to have got back to your earlier.
I tried following your suggestions, not sure if I have got it right yet.
I made some alterations and the new code is attached.
Still getting 1 error now:
Error      38      'System.Web.UI.Page' does not contain a definition for 'DataItem' and no extension method 'DataItem' accepting a first argument of type 'System.Web.UI.Page' could be found (are you missing a using directive or an assembly reference?)      c:\Projects\Web\AssetAllocation\FeedRssCS.aspx      26      38      http://localhost/AssetAllocation/

<%#DataBinder.Eval(Container.DataItem,"title") %>

using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class rssCS : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        /// delete this line----GridView.DataSource = GetDataSet().Tables[3];
        ///delete this line----GridView.DataBind();
    }
    private DataSet GetDataSet()    
    {
        DataSet ds = new DataSet("rsRSS");
        ds.ReadXml("http://rss.news.yahoo.com/rss/mostviewed");
        ///delete this line----GridView.DataMember = "item";
        ///delete this line----GridView.DataSource = ds;
        //delete this line----GridView1.DataBind();
        return ds;
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        GridViewRow row = e.Row;
        DateTime CurrTime = DateTime.Now.Date;
        if (row.RowIndex >= 0) // Start looping on the first row
            if (row.RowType == DataControlRowType.DataRow)
            {
                row.Cells[0].Text = row.Cells[0].Text;
                row.Cells[1].Text = row.Cells[1].Text;
            }
        }
}
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="~/App_Code/CodeCS/FeedRss.aspx.cs" Inherits="rssCS" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Web.Configuration" %>
<%@ Import Namespace="System.Collections" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Linq" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Web.UI" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>FeedRss</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:GridView
        id="GridView"
        DataSourceId="srcMovies"
        Runat="server" />
        <ItemTemplate>
        <asp:HyperLink ID="HyperLink1" NavigateUrl=<%#DataBinder.Eval(Container.DataItem,"link") %> 
        runat="server">
        <%#DataBinder.Eval(Container.DataItem,"title") %>
        </asp:HyperLink>
        </ItemTemplate>
        </asp:GridView>
<!--
-->
    </div>
    </form>
</body>
</html>

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