学步园

public void WriteXML(string FileName,string server,string IDServiceid,string name)
   {
    if (!File.Exists(FileName))
        {
            XmlTextWriter textWriter = new XmlTextWriter(FileName,null);
            textWriter.Formatting = Formatting.Indented;

            // 开始写过程，调用WriteStartDocument方法
            textWriter.WriteStartDocument();

            // 写入说明
            textWriter.WriteComment("First Comment XmlTextWriter Sample Example");
            textWriter.WriteComment("YtConfig.xml in root dir");

            //创建一个节点
            textWriter.WriteStartElement("Server");
            //textWriter.WriteElementString("MapServers","");
            //textWriter.WriteElementString("site", "w3sky.com");
            textWriter.WriteEndElement();

            // 写文档结束，调用WriteEndDocument方法
            textWriter.WriteEndDocument();

           // 关闭textWriter
           textWriter.Close();

        }  
        //初始化XML文档操作类
        XmlDocument myDoc = new XmlDocument();
        //加载XML文件
        myDoc.Load(FileName);

        //添加元素--UserCode
        XmlElement ele = myDoc.CreateElement("UserCode");
        XmlText text = myDoc.CreateTextNode(server);

        //添加元素--UserName
        XmlElement ele1 = myDoc.CreateElement("UserName");
        XmlText text1 = myDoc.CreateTextNode(IDServiceid);

        //添加元素--UserPwd
        XmlElement ele2 = myDoc.CreateElement("UserPwd");
        XmlText text2 = myDoc.CreateTextNode(name);

        //添加节点 User要对应我们xml文件中的节点名字
        XmlNode newElem = myDoc.CreateNode("element", "User", "");

        //在节点中添加元素
        newElem.AppendChild(ele);
        newElem.LastChild.AppendChild(text);
        newElem.AppendChild(ele1);
        newElem.LastChild.AppendChild(text1);
        newElem.AppendChild(ele2);
        newElem.LastChild.AppendChild(text2);
        XmlNode roots = myDoc.CreateNode("element", "MapServers", "");
        roots.AppendChild(newElem);

        //将节点添加到文档中
        XmlElement root = myDoc.DocumentElement;
        root.AppendChild(roots);

        //保存
        myDoc.Save(FileName);   
    }

生成的xml为：

<?xml version="1.0"?>
<!--First Comment XmlTextWriter Sample Example-->
<!--YtConfig.xml in root dir-->
<Server>
  <MapServers>
    <User>
      <UserCode>
      </UserCode>
      <UserName>
      </UserName>
      <UserPwd>
      </UserPwd>
    </User>
  </MapServers>
</Server>

读操作：

public string ReadXML(string path, string id) {
        string stat = null;
        string FileName = AppDomain.CurrentDomain.BaseDirectory;
        FileName += path + ".xml";
        string type = path + "s";
        if (File.Exists(FileName))
        {
            //初始化XML文档操作类
            XmlDocument myDoc = new XmlDocument();
            //加载XML文件
            myDoc.Load(FileName);
            if (myDoc.SelectSingleNode(type).ChildNodes.Count != 0)
            {
                XmlNodeList nodeList = myDoc.SelectSingleNode(type).ChildNodes;
                foreach (XmlNode xn in nodeList)
                {
                    XmlElement xe = (XmlElement)xn;
                    if (xe.GetAttribute("IDServiceid") == id)
                    {
                        stat = "fail";
                        break;
                    }
                    else { stat = "ok"; }
                }
            }
            else { stat = "ok"; }
        }
        else
        {
            return stat = "ok";
        }
        return stat;

    }

删除节点操作：

public string DelXML(string id, string path)
    {
        string stat = null;
        string FileName = AppDomain.CurrentDomain.BaseDirectory;
        string type = path + "s";
        FileName += path + ".xml";
        if (File.Exists(FileName))
        {
            //初始化XML文档操作类
            XmlDocument myDoc = new XmlDocument();
            //加载XML文件
            myDoc.Load(FileName);
            if (myDoc.SelectSingleNode(type).ChildNodes.Count != 0)
            {
                XmlNodeList nodeList = myDoc.SelectSingleNode(type).ChildNodes;
                foreach (XmlNode xn in nodeList)
                {
                    XmlElement xe = (XmlElement)xn;
                    if (xe.GetAttribute("IDServiceid") == id)
                    {
                        myDoc.SelectSingleNode(type).RemoveChild(xe);
                        stat = "ok";
                        myDoc.Save(FileName);
                        break;
                    }
                    else
                    {
                        stat = "error";
                    }
                }
            }
            else {
                stat = "error";
            }
        }
        else
        {
            stat = "error";
        }
        return stat;
    }