XDocument，XElement：Sequence不包含匹配的元素(XDocument, XElement : Sequence contains no matching element)

XDocument，XElement：Sequence不包含匹配的元素(XDocument, XElement : Sequence contains no matching element)

使用C＃搜索XML文件的元素，但获得关注

错误：序列不包含匹配元素

XNamespace siteNM = "http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"; XDocument sitemap = new XDocument (new XDeclaration("1.0", "UTF-8", null), new XElement(siteNM + "siteMap", new XElement(siteNM + "siteMapNode", new XAttribute("title", "Home"), new XAttribute("url", "home.aspx"), new XAttribute("description", "Home")) )); XElement x = sitemap.Root;

我试过以下两种搜索元素的方法 ，但都给我同样的错误 。

第一种方式：

XElement child = x.Descendants("siteMapNode").Where(el => el.Attribute("title") != null && el.Attribute("title").Value == "Home").First();

第二种方式：

XElement child1 = x.Descendants("siteMapNode").First(el => (string)el.Attribute("title") == "Home");

请帮帮我。 非常感谢..

Searching element of xml file using C# but getting following

Error: Sequence contains no matching element

XNamespace siteNM = "http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"; XDocument sitemap = new XDocument (new XDeclaration("1.0", "UTF-8", null), new XElement(siteNM + "siteMap", new XElement(siteNM + "siteMapNode", new XAttribute("title", "Home"), new XAttribute("url", "home.aspx"), new XAttribute("description", "Home")) )); XElement x = sitemap.Root;

I have tried following two methods for searching element but both give me same error.

1st way:

XElement child = x.Descendants("siteMapNode").Where(el => el.Attribute("title") != null && el.Attribute("title").Value == "Home").First();

2nd Way:

XElement child1 = x.Descendants("siteMapNode").First(el => (string)el.Attribute("title") == "Home");

please help me. Thank you so much..

最满意答案

缺少名称空间

XElement child = x.Descendants(siteNM + "siteMapNode") .First(el => el.Attribute("title") != null && el.Attribute("title").Value == "Home");

missing namespace

XElement child = x.Descendants(siteNM + "siteMapNode") .First(el => el.Attribute("title") != null && el.Attribute("title").Value == "Home");