XML文件读写修改

读取xml文件然后修改数据 保存xml文件
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(“send.xml”);

        string[] str = new string[] { "MesLog\\", null, null, null, null };
        if (!System.IO.Directory.Exists("MesLog"))
            System.IO.Directory.CreateDirectory("MesLog");
       DateTime now = DateTime.Now;
        str[1] = now.ToString("yyyyMMdd");
        if (!System.IO.Directory.Exists("MesLog\\" + str[1]))
            System.IO.Directory.CreateDirectory("MesLog\\" + str[1]);
        str[2] = "\\" + "Send" + "_";
        now = DateTime.Now;
        str[3] = now.ToString("HHmmss.fff");
        str[4] = ".xml";
        //  MessageBox.Show(string.Concat(str));        
        XmlNodeList xmlElement = (XmlNodeList)xmlDocument.GetElementsByTagName("arg0");
        XmlNode nodesendprm1 = xmlElement.Item(0);
        nodesendprm1.InnerXml = "test10";

        XmlNodeList xmlElement2 = (XmlNodeList)xmlDocument.GetElementsByTagName("arg1");
        XmlNode nodesendprm2 = xmlElement2.Item(0);
        nodesendprm2.InnerXml = "test20";

        XmlNodeList xmlElement3 = (XmlNodeList)xmlDocument.GetElementsByTagName("arg2");
        XmlNode nodesendprm3 = xmlElement3.Item(0);
        nodesendprm3.InnerXml = "test30";
        xmlDocument.Save(string.Concat(str));
        text文本解析成xml文件然后保存xml