[Unity] Basic operation of C# on XML.

Create or load an XML document

//创建一个XML文档
private XmlDocument xmlDocument = new XmlDocument();
if
	//加载XML文档
	xmlDocument.Load(XmlFilePath);
else
	//创建文档
	//添加头节点
	xmlDocument.AppendChild(xmlDocument.CreateXmlDeclaration("1.0", "utf-8", null));
	//创建根节点
	XmlElement rootNode_Ele = xmlDocument.CreateElement(rootNodeName);
	//添加根节点
	xmlDocument.AppendChild(paths);
	//保存XML文件
	xmlDocument.Save(XmlFilePath);

query node

	//查询一个节点
	XmlNode tempXmlNode = xmlDocument.SelectSingleNode(...ParentNode+ "/" + nodeName);
	//查询多个节点
	XmlNodeList tempXmlNodes = xmlDocument.SelectNodes(...ParentNode+ "/" + nodeName);

add node

	///对根节点添加一个子节点
	XmlNode rootNode = xmlDocument.SelectSingleNode(rootName);
	if (rootNode != null)
        {
    
    
            XmlElement xmlElement = xmlDocument.CreateElement(nodeName);
            //添加内容
            xmlElement.InnerText = contentText;
            //添加属性
            xmlElement.SetAttribute(name，value);
            rootNode.AppendChild(xmlElement);
        }

delete node

	XmlNode tempXmlNode = xmlDocument.SelectSingleNode(nodeName);
	//删除一个节点
	xmlNode.ParentNode.RemoveChild(xmlNode);
	//删除同级所有节点
	xmlNode.ParentNode.RemoveAll();