读操作：

　　　　　　　　XmlDocument xmlDoc = new XmlDocument();

             XmlReaderSettings settings = new XmlReaderSettings();

             settings.IgnoreComments = true;//忽略文档里面的注释

             var path = HttpContext.Server.MapPath("../../SiteConfig/Siteconfig.xml");//获取文件路径

             var myXDocument = XDocument.Load(path);

             EditWebConfigViewModel siteconfigModel = new EditWebConfigViewModel();

             siteconfigModel.WebName = myXDocument.Element("SiteConfig").Element("WebName").Value;

             siteconfigModel.CompanyName = myXDocument.Element("SiteConfig").Element("CompanyName").Value;

             siteconfigModel.Address = myXDocument.Element("SiteConfig").Element("Address").Value;

             siteconfigModel.Tel = myXDocument.Element("SiteConfig").Element("Tel").Value;

             siteconfigModel.Email = myXDocument.Element("SiteConfig").Element("Email").Value;

             siteconfigModel.RecordNumber = myXDocument.Element("SiteConfig").Element("RecordNumber").Value;

             siteconfigModel.SeoTitle = myXDocument.Element("SiteConfig").Element("SeoTitle").Value;

             siteconfigModel.SeoKey = myXDocument.Element("SiteConfig").Element("SeoKey").Value;

             siteconfigModel.SeoDescription = myXDocument.Element("SiteConfig").Element("SeoDescription").Value;

             siteconfigModel.Copyright = myXDocument.Element("SiteConfig").Element("Copyright").Value;
写操作：
　　　　　　　　 var path = HttpContext.Server.MapPath("../../SiteConfig/Siteconfig.xml");
                var myXDocument = XDocument.Load(path);
                myXDocument.Element("SiteConfig").Element("WebName").Value = editWebConfig.WebName;
                myXDocument.Element("SiteConfig").Element("CompanyName").Value = editWebConfig.CompanyName;
                myXDocument.Element("SiteConfig").Element("Address").Value = editWebConfig.Address;
                myXDocument.Element("SiteConfig").Element("Tel").Value = editWebConfig.Tel;
                myXDocument.Element("SiteConfig").Element("Email").Value = editWebConfig.Email;
                myXDocument.Element("SiteConfig").Element("RecordNumber").Value = editWebConfig.RecordNumber;
                myXDocument.Element("SiteConfig").Element("SeoTitle").Value = editWebConfig.SeoTitle;
                myXDocument.Element("SiteConfig").Element("SeoKey").Value = editWebConfig.SeoKey;
                myXDocument.Element("SiteConfig").Element("SeoDescription").Value = editWebConfig.SeoDescription;
                myXDocument.Element("SiteConfig").Element("Copyright").Value = editWebConfig.Copyright;
                myXDocument.Save(path);