你们猜这段代码的执行结果是 True Or False?
System.Xml.XmlDocument doc = new XmlDocument();
doc.LoadXml("<root><a/></root>");
System.Xml.XmlNamespaceManager nsm = new XmlNamespaceManager(doc.NameTable);
nsm.AddNamespace("a","DAV");
MessageBox.Show(nsm.HasNamespace("a").ToString());