c# 生成、读取xml

生成：

<?xml version="1.0" encoding="utf-8"?>
<CategoryList>
<Category ID="01">
<MainCategory>XML</MainCategory>
<Description>This is a list my XML articles.</Description>
<Active>true</Active>
</Category>
</CategoryList>

XmlDocument xmlDoc = new XmlDocument();
XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0","utf-8",null);
XmlElement rootNode  = xmlDoc.CreateElement("CategoryList");
xmlDoc.InsertBefore(xmlDeclaration, xmlDoc.DocumentElement);
xmlDoc.AppendChild(rootNode);
XmlElement parentNode  = xmlDoc.CreateElement("Category");
parentNode.SetAttribute("ID", "01");
xmlDoc.DocumentElement.PrependChild(parentNode);
XmlElement mainNode  = xmlDoc.CreateElement("MainCategory");
XmlElement descNode  = xmlDoc.CreateElement("Description");
XmlElement activeNode  = xmlDoc.CreateElement("Active");
XmlText categoryText= xmlDoc.CreateTextNode("XML");
XmlText descText  = xmlDoc.CreateTextNode("This is a list my XML articles.");
XmlText activeText  = xmlDoc.CreateTextNode("true");
parentNode.AppendChild(mainNode);
parentNode.AppendChild(descNode);
parentNode.AppendChild(activeNode);
mainNode.AppendChild(categoryText);
descNode.AppendChild(descText);
activeNode.AppendChild(activeText);
xmlDoc.Save(Server.MapPath("categories.xml"));

读取：

try
            {
                if (File.Exists(versionPath))
                {
                    XmlDocument doc = new XmlDocument();
                    doc.Load(versionPath);
                    foreach (XmlNode node in doc.SelectSingleNode("citylist").ChildNodes)
                    {
                        versionDic.Add(node.Attributes["code"].Value, Convert.ToInt64(node.Attributes["version"].Value));
                    }
                }
            }
            catch
            { }