public void CalculateLeave(string userAcount, string xml)   //传过来的是xml内容

         {

             try

             {

                 var xmlDoc = new System.Xml.XmlDataDocument();   //生成一个xml操作对象

                 xmlDoc.LoadXml(xml);    //加载xml内容文本      注意Load加载的是物理路径

                 var xmlRoot = xmlDoc.DocumentElement;        //使用 XmlDocument读取的方法，还有LINQ和XmlTextReader

                 if (xmlRoot == null) return;

                 var node = xmlRoot.SelectNodes("Item");    //找到所有的Item节点

                 if (node == null) return;

                 decimal sum = ;

                 foreach (XmlNode xn in node)

                 {

                     var singleNode = xn.SelectSingleNode("ExpenseType");  //SelectNodes和SelectSingleNode就是所有和单个的区别

                     if (singleNode == null || singleNode.InnerText != "年休假") continue;

                     var selectSingleNode = xn.SelectSingleNode("Days");

                     if (selectSingleNode == null) continue;

                     var day = selectSingleNode.InnerText;

                     sum += Convert.ToDecimal(day);

                 }

                 var user = BLL.MasterDataSservice.UserConfigureService.GetInstance().Get(userAcount);

                 user.Annualleave = Convert.ToDecimal(user.Annualleave) - sum;

                 BLL.MasterDataSservice.UserConfigureService.GetInstance().Update(user);

             }

             catch (Exception)

             {

             }

         }