xml文件的读和写

1.xml的写（创建xml文件）：
XmlTextWriter myWriter = new XmlTextWriter(文件路径，null);
                //写XML 的文档版本号1.0
            myWriter.WriteStartDocument();
            //写开始元素
            myWriter.WriteStartElement("root");
            //写元素
            myWriter.WriteStartElement("a");
            myWriter.WriteString("Tale");
            myWriter.WriteEndElement();

            myWriter.WriteStartElement("b");
            myWriter.WriteString("Th");
            myWriter.WriteEndElement();

            myWriter.WriteStartElement("c");
            myWriter.WriteString("T3");
            myWriter.WriteEndElement();

            //写结束文档
            myWriter.WriteEndDocument();
            //关闭流且保存文件中去
            myWriter.Close();

           
2.xml的读：

XmlReader xmlr = XmlReader.Create(文件路径);
            xmlr.MoveToContent();
            xmlr.Read();
            if (xmlr.Name.ToString() == "databasename")
            {
                databaseName= xmlr.ReadInnerXml().ToString();
               //顺序读其他元素
                .........
            }

另外：
 XmlReader xmlr = XmlReader.Create("ftp_set.xml");//打开要读取的文档
            xmlr.MoveToContent();
            while (xmlr.Read()) //循环读取
            {
                switch (xmlr.Name.ToString())
                {
                    case "uri":  //xml标签
                        this.strFTPURI = xmlr.ReadInnerXml().ToString();
                        break;
                    case "potnumber":
                        strPotNum = xmlr.ReadInnerXml().ToString();
                        break;
                    case "username":
                        this.strUserName = xmlr.ReadInnerXml().ToString();
                        break;
                    case "password":
                        this.strPassword = xmlr.ReadInnerXml().ToString();
                        break;
                }
            }

3.注意：xml读的时候如果文件内有空格和回车，一次读将读空格和回车。可以编程忽略掉这些空格和回车。