xml檔案的讀和寫

1.xml的寫（建立xml檔案）：
XmlTextWriter myWriter = new XmlTextWriter(檔案路徑，null);
                //寫XML 的文檔版本號碼1.0
            myWriter.WriteStartDocument();
            //寫開始元素
            myWriter.WriteStartElement("root");
            //寫元素
            myWriter.WriteStartElement("a");
            myWriter.WriteString("Tale");
            myWriter.WriteEndElement();

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

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

            //寫結束文檔
            myWriter.WriteEndDocument();
            //關閉流且儲存檔案中去
            myWriter.Close();

           
2.xml的讀：

XmlReader xmlr = XmlReader.Create(檔案路徑);
            xmlr.MoveToContent();
            xmlr.Read();
            if (xmlr.Name.ToString() == "databasename")
            {
                databaseName= xmlr.ReadInnerXml().ToString();
               //順序讀其他元素
                .........
            }

另外：
 XmlReader xmlr = XmlReader.Create("ftp_set.xml");//開啟要讀取的文檔
            xmlr.MoveToContent();
            while (xmlr.Read()) //迴圈讀取
            {
                switch (xmlr.Name.ToString())
                {
                    case "uri":  //xml標籤
                        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讀的時候如果檔案內有空格和斷行符號，一次讀將讀空格和斷行符號。可以編程忽略掉這些空格和斷行符號。