查找字符串中包含属性值的XmlNode [英] Find XmlNode where attribute value is contained in string

问题描述

我有一个xml文件...

I have an xml file...

<?xml version="1.0" encoding="UTF-8"?>
<items defaultNode="1">
    <default contentPlaceholderName="pageContent" template="" genericContentItemName="" />
    <item urlSearchPattern="connections-learning" contentPlaceholderName="pageContent" template="Connections Learning Content Page" genericContentItemName="" />
    <item urlSearchPattern="online-high-school" contentPlaceholderName="pageContent" template="" genericContentItemName="" />
</items>

我正在尝试查找字符串urlSearchPattern中包含urlSearchPattern属性的第一个节点.我遇到麻烦的地方是找到属性包含在字符串值中而不是字符串值包含在属性中的节点.

I am trying to find the first node where the urlSearchPattern attribute is contained in the string urlSearchPattern. Where I'm having trouble is finding the nodes where the attribute is contained in the string value instead of the string value be contained in the attribute.

到目前为止，这是我的尝试.这将找到属性值中包含字符串值的firstOrDefault节点(我需要相反的意思)...

Here's my attempt so far. This will find the firstOrDefault node where the string value is contained in the attribute (I need the opposite)...

string urlSearchPattern = Request.QueryString["aspxerrorpath"];
MissingPageSettingsXmlDocument missingPageSettingsXmlDocument = new MissingPageSettingsXmlDocument();
XmlNode missingPageItem = missingPageSettingsXmlDocument.SelectNodes(ITEM_XML_PATH).Cast<XmlNode>().Where(item => item.Attributes["urlSearchPattern"].ToString().ToLower().Contains(urlSearchPattern)).FirstOrDefault();

推荐答案

好吧...然后反转！

var result = missingPageSettingsXmlDocument
                .SelectNodes(ITEM_XML_PATH)
                .Cast<XmlNode>()
                .FirstOrDefault(
                    m => m.Attributes != null && 
                    m.Attributes["urlSearchPattern"] != null && 
                    urlSearchPattern.Contains(m.Attributes["urlSearchPattern"].ToString().ToLower())
                 );

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