GetElementById()找不到标签? [英] GetElementById() not finding the tag?

问题描述

我有一个有效的XML文件，正在由以下.NET C#Windows服务读取. 有问题的标签(u1_000)绝对位于元素中:

I have a valid XML file being read by the following .NET C# windows service. The tag in question (u1_000) is absolutely in the element:

<book id="u1_000" category="xyz"> 

是否由于某种原因，GetElementById()找不到带有标签的Book元素? -谢谢

Is there some reason the GetElementById() does not find the Book element with the tag? - thanks

XmlDocument doc = new XmlDocument();
doc.Load("C:\\j.xml");
XmlElement ee = doc.GetElementById("U1_000");

<book id="U1_000" category="web"> 

推荐答案

如果没有其他问题，也许可以使用xpath作为备份:

If nothing else, perhaps use xpath as a backup:

string id = "u1_000";
string query = string.Format("//*[@id='{0}']", id); // or "//book[@id='{0}']"
XmlElement el = (XmlElement)doc.SelectSingleNode(query);

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