读取和修改xml文件

如有一个xml文件DownData.xml，内容如下

<?xml version="1.0" standalone="yes"?>
<Root>
  <Downloads></Downloads>
  <Consumption></Consumption>
  <Rebate>207977.26</Rebate>
</Root>

读取数据

  private void GetInfo()
        {
            DataSet ds = new DataSet();
            string strXmlPath = Server.MapPath("~/config/DownData.xml");//xml路径
            ds.ReadXml(strXmlPath);
            string downStr= ds.Tables[].Rows[]["Downloads"].ToString();
            string conStr=  ds.Tables[].Rows[]["Consumption"].ToString();
           string reStr=  ds.Tables[].Rows[]["Rebate"].ToString();
        }

修改数据

        protected void Change()
        {

            DataSet ds = new DataSet();
            string strXmlPath = Server.MapPath("~/config/DownData.xml");

            ds.ReadXml(strXmlPath);
            ds.Tables[].Rows[]["Downloads"] ="";
            ds.Tables[].Rows[]["Consumption"] = "";
            ds.Tables[].Rows[]["Rebate"] = "";
            ds.AcceptChanges();
            //写入xml

            ds.WriteXml(strXmlPath);
        }