asp.net-mvc - 在MVC ASP.NET中使用/显示RSS提要的简便方法

Question

我是MVC框架的新手，想知道如何将RSS数据从 Controller 传递到 View 。我知道有必要转换为某种IEnumerable列表。我已经看到了一些创建匿名类型的示例，但无法弄清楚如何将RSS feed转换为通用列表并将其传递给 View 。

我也不希望它被强类型输入，因为将有多个对各种RSS feed的调用。

有什么建议么。

Answer 1

我一直在尝试在MVC中制作WebPart的方法，这些方法基本上是包装在webPart容器中的UserControls。我测试的UserControls之一是Rss Feed控件。我使用Futures dll中的RenderAction HtmlHelper扩展来显示它，以便调用 Controller Action 。我使用SyndicationFeed类来完成大部分工作

using (XmlReader reader = XmlReader.Create(feed))
{
    SyndicationFeed rssData = SyndicationFeed.Load(reader);

    return View(rssData);
 }

下面是 Controller 和UserControl代码:

Controller 代码为:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Ajax;
using System.Xml;
using System.ServiceModel.Syndication;
using System.Security;
using System.IO;

namespace MvcWidgets.Controllers
{
    public class RssWidgetController : Controller
    {
        public ActionResult Index(string feed)
        {
            string errorString = "";

            try
            {
                if (String.IsNullOrEmpty(feed))
                {
                    throw new ArgumentNullException("feed");
                }
                    **using (XmlReader reader = XmlReader.Create(feed))
                    {
                        SyndicationFeed rssData = SyndicationFeed.Load(reader);

                        return View(rssData);
                    }**
            }
            catch (ArgumentNullException)
            {
                errorString = "No url for Rss feed specified.";
            }
            catch (SecurityException)
            {
                errorString = "You do not have permission to access the specified Rss feed.";
            }
            catch (FileNotFoundException)
            {
                errorString = "The Rss feed was not found.";
            }
            catch (UriFormatException)
            {
                errorString = "The Rss feed specified was not a valid URI.";
            }
            catch (Exception)
            {
                errorString = "An error occured accessing the RSS feed.";
            }

            var errorResult = new ContentResult();
            errorResult.Content = errorString;
            return errorResult;

        }
    }
}

用户控件

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Index.ascx.cs" Inherits="MvcWidgets.Views.RssWidget.Index" %>
<div class="RssFeedTitle"><%= Html.Encode(ViewData.Model.Title.Text) %> &nbsp; <%= Html.Encode(ViewData.Model.LastUpdatedTime.ToString("MMM dd, yyyy hh:mm:ss") )%></div>

<div class='RssContent'>
<% foreach (var item in ViewData.Model.Items)
   {
       string url = item.Links[0].Uri.OriginalString;
       %>
   <p><a href='<%=  url %>'><b> <%= item.Title.Text%></b></a>
   <%  if (item.Summary != null)
       {%>
        <br/> <%= item.Summary.Text %>
    <% }
   } %> </p>
</div>

修改后的代码以拥有类型化的模型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.ServiceModel.Syndication;

namespace MvcWidgets.Views.RssWidget
{
    public partial class Index : System.Web.Mvc.ViewUserControl<SyndicationFeed>
    {
    }
}