ASP.NET RSS Toolkit(RSS工具)

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() &lt;=$Sort">
<tr>
<td width="21"><img src="http://download.pchome.net/allimage/p1.gif"/></td>
<td><a href="{link}"><xsl:value-of select="resuls:GetSubString(title,$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

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