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ASP.NET RSS Toolkit(RSS工具)

 2006-05-14 17:08:51 来源:WEB开发网   
核心提示:还记得以前吗?以前要做页面上写个小组件,调用指定(rss输出地址的)的内容,ASP.NET RSS Toolkit(RSS工具),最好的办法就是通过XSLT+xml来输出字符 串,让我们还是花了一分钟的时候回忆一下以前的做法吧曾经的做法: PRotected Overrides Sub OnLoad(ByVal e A

还记得以前吗?以前要做页面上写个小组件,调用指定(rss输出地址的)的内容。最好的办法就是通过XSLT+xml来输出字符 串。让我们还是花了一分钟的时候回忆一下以前的做法吧

曾经的做法:

 PRotected Overrides Sub OnLoad(ByVal e As System.EventArgs)
       Dim CacheKey As String = Url & "-" & Sort
       Dim objCache As System.Web.Caching.Cache = HttpRuntime.Cache
       If objCache.Item(CacheKey) Is Nothing Then
         Dim xpDocument As XPathDocument = New XPathDocument(Url, XmlSpace.Preserve)
         Dim XTran As XslTransform = New XslTransform
         XTran.Load(Web.HttpRuntime.AppDomainAppPath & "TransForm.xsl") 'TransForm.xsl
         Dim sw As StringWriter = New StringWriter

       Dim xArgList As XsltArgumentList = New XsltArgumentList
         xArgList.AddParam("Sort", "", Sort)
         xArgList.AddParam("strlength", "", strLength)
         XTran.Transform(xpDocument, xArgList, sw)
         objCache.Insert(CacheKey, sw, Nothing, DateTime.Now.AddMinutes(15), TimeSpan.Zero)
       End If
       MyBase.Text = CType(objCache.Item(CacheKey), StringWriter).ToString

   End SubXSLT转换文件

<?xml version="1.0" encoding="gb2312"?>
<xsl:stylesheet
   version="1.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   xmlns="http://www.w3.org/TR/REC-html40"
   xmlns:msxsl="urn:schemas-microsoft-com:xslt"
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
   xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
   xmlns:resuls="urn:StrLength">
<xsl:param name="Sort" select="'10'"></xsl:param>
<xsl:param name="strlength" select="'15'"></xsl:param>
<xsl:template match="//rss">
   <xsl:apply-templates select="channel" />
</xsl:template>

<msxsl:script language="VB" implements-prefix="resuls">
<![CDATA[
   Function GetSubString(byval origStr As String, byval endIndex As Integer) As String
  Dim bytes As Byte() = System.Text.Encoding.GetEncoding("gb2312").GetBytes(origStr)
  If endIndex >= bytes.Length Then
    Return origStr
  End If
  Dim subBytes(endIndex) As Byte
  Array.Copy(bytes, 0, subBytes, 0, endIndex)
  Return System.Text.Encoding.GetEncoding("gb2312").GetString(subBytes) + ""
End Function 'GetSubString

   public function strDate(byval s as string)as string
     return CDate(s).Day.ToString & "日"
   end function
]]>
</msxsl:script>

<xsl:template match="channel">
   <table width="300" border="0" cellspacing="0" cellpadding="0">
     <xsl:for-each select="item">
       <xsl:if test="position() <=$Sort">
       <tr>
         <td width="21"><img src="http://download.pchome.net/allimage/p1.gif"/></td>
         <td><a href="{link}"><xsl:value-of select="resuls:GetSubString(title,$strlength)"/></a>  <xsl:value-of select="resuls:strDate(dc:date)"/></td>
       </tr>
       </xsl:if>
     </xsl:for-each>
   </table>
</xsl:template>
</xsl:stylesheet>

而现在。根据MS的想法。一切只要拖拖控件就能完成我们的所要功能(我一向不喜欢这样,还是自己DIY好)。所以。下面介绍这款小工具:asp.net RSS Toolkit
RSS TOOLKIT主要是从服务器上装载RSS输出(XML格式输出),生成数据集,然后填充到DATALIST控件当中。另外它支持数据缓存的功能
目前最新版本:1.0.0.1
新的特性:
•   Added MaxItems property to RssDataSource to limit the number of items returned.
•   Added automatic generation of <link> tags from RssHyperLink control, to light up the RSS
toolbar icon in IE7. For more information please see http://blogs.msdn.com/rssteam/articles/PublishersGuide.aspx
•   Added protected Context property (of type HttpContext) to RssHttpHandlerBase class, to allow access to the
HTTP request while generating a feed.
•   Added generation of LoadChannel(string url) method in RssCodeGenerator so that one strongly typed
channel class can be used to consume different channels.
•   Fixed problem expanding app relative (~/…) links containing query string when generating RSS feeds.
下载地址:点击下载
详细说明:http://weblogs.asp.net/scottgu/archive/2006/02/22/438738.aspx

创建新的页面

为datalist控件创建新的数据源

选择rssDataSource

输入RSS地址(我这里以http://rss.msnbc.msn.com/id/3032091/device/rss/rss.xml)


 

根据RSS输出的格式,进行绑定



<%@ Register Assembly="RssToolkit" Namespace="RssToolkit" TagPrefix="RssToolkit" %>

 

<html>

<head runat="server">

  <title>ScottGu Feed</title>

</head>

<body>

  <form id="form1" runat="server">

  <div>

  

    <h2>ScottGu Blog Feed</h2>  

    

    <asp:DataList ID="DataList1" runat="server" CellPadding="4" DataSourceID="RssDataSource1" ForeColor="#333333">

      <ItemTemplate>

        <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%# Eval("link") %>' Text='<%# Eval("title") %>'></asp:HyperLink>

      </ItemTemplate>

    </asp:DataList>

    

    <RssToolkit:rssdatasource id="RssDataSource1" runat="server" url="http://weblogs.asp.net/scottgu/Rss.aspx">

    </RssToolkit:rssdatasource>

 

  </div>

  </form>

</body>

</html>

OK。现在可以浏览一下效果


晚上出去吃晚饭的时候。走出外面,感觉到夏天的来到。呵。我喜欢夏天的这种感觉。带上好的心情,出去走走。也是一种很好的享受。最后。推荐一首歌:夏天的味道。

Tags:ASP NET RSS

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