得到的结果的特定数量从一个如下XPath查询 [英] Get a specific number of results from an XmlDocument XPath query
问题描述
我查询一个Twitter的RSS源,并将结果提供到用于显示的中继器。我想只获得第5的结果XPath查询。有没有办法做到这一点在XPath语法还是我不得不遍历产生的的XmlNodeList
拉出第5?
XmlDocument的DOC =新的XmlDocument();
XmlTextReader的读者= XmlTextReader的新(rssPath);
doc.Load(读卡器);XmlNodeList中的项目= doc.SelectNodes(/ RSS /渠道/项目);rptTwitter.ItemDataBound + =新RepeaterItemEventHandler(rptTwitter_ItemDataBound);
rptTwitter.DataSource =物品;
rptTwitter.DataBind();
试试这个XPath查询来代替:
(/ RSS /渠道/项)位置()< = 5]
它只返回前五个匹配的项目。括号是重要的,因为没有他们的 [位置()< = 5]
部分适用于项目
元素的在其母公司,而不是其在结果节点集中位置的位置。
I'm querying a Twitter RSS feed and supplying the results into a Repeater for display. I'd like to only get the first 5 results of the XPath query. Is there a way to do that in the XPath syntax or do I have to loop over the resulting XmlNodeList
to pull out the first 5?
XmlDocument doc = new XmlDocument();
XmlTextReader reader = new XmlTextReader(rssPath);
doc.Load(reader);
XmlNodeList items = doc.SelectNodes("/rss/channel/item");
rptTwitter.ItemDataBound += new RepeaterItemEventHandler(rptTwitter_ItemDataBound);
rptTwitter.DataSource = items;
rptTwitter.DataBind();
Try this XPath query instead:
(/rss/channel/item)[position() <= 5]
It returns only the first five matching items. The parentheses are important, as without them the [position() <= 5]
part applies to the item
element's position in its parent rather than its position in the result node set.
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