When XmlDocument innovates objects, the solution to generate xmlns=''_PHP Tutorial

When I encountered the XmlDocument innovative object during development today, xmlns="" was generated. After analysis, I summarized the problem. If you need a reference, it may help you solve this problem. ​

1. When reading, NameSpace.

should be added

The code is as follows

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var exclDef = excl.SelectSingleNode(@ "ns:worksheet/ns:sheetData", excl.GetNameSpaceManager("ns"));   代码如下 复制代码 var exclDef = excl.SelectSingleNode(@"ns:worksheet/ns:sheetData", excl.GetNameSpaceManager("ns"));        public static XmlNamespaceManager GetNameSpaceManager(this XmlDocument xml, string NameSpace)        {            XmlNamespaceManager nsmgr = new XmlNamespaceManager(xml.NameTable);            nsmgr.AddNamespace(NameSpace, xml.DocumentElement.NamespaceURI);            return nsmgr;        } public static XmlNamespaceManager GetNameSpaceManager(this XmlDocument xml, string NameSpace) {                                             XmlNamespaceManager nsmgr = new XmlNamespaceManager(xml.NameTable);  }

2. If you create a node without specifying NamespaceURI, xmlns="" will be generated. For the reason, please refer to:

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If the three-level NameSpaceURIs of ABC are XYY, then the generated NameSpaceURIs of ABC are AB empty, and C will not generate NameSpaceURI, because C and its parent have the same NameSpaceURI.

So when creating a node, in order to avoid NameSpaceURI appearing, please keep the same NameSpaceURI as the node parent.

var si = e.OwnerDocument.CreateElement("si", e.NamespaceURI); e.AppendChild(si);

In addition, when innovating attributes, do not specify NameSpaceURI, that is, the generated Xml will not have a specific NameSpaceURI.

var r = excl.CreateAttribute("r");