Parsing web.config with XmlDocument.SelectSingleNode

问题现象：

I have an utility that modified ASP.NET web.config using code like this:

XmlDocument document = new XmlDocument();

document.Load(sConfigFileName);

XmlNode nodeParent = document.SelectSingleNode("/configuration/system.web");

I found that this code doesn't work with VS 2005 (SelectSingleNode returns null) because configuration element has xmlns

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> .

I was able to delete xmlns attribute without any visible side effects to make SelectSingleNode("/configuration/system.web") working .

But it will be probably required to use new classes in Configuration namespace or use XmlNamespaceManager.

解决方案：

XmlDocument document = new XmlDocument();

document.Load(sConfigFileName);

XmlNamespaceManager ns = new XmlNamespaceManager(document.NameTable);

ns.AddNamespace("x", "http://schemas.microsoft.com/.NetConfiguration/v2.0");

XmlNode myNode = document.SelectSingleNode("/x:configuration/x:system.web",ns);

试过可行

原文地址：http://geekswithblogs.net/mnf/archive/2006/02/02/67909.aspx