更改XML文件内容（发票管理软件）

 public void AlterXml(string pathstring)//List<string> name,List<string> value)
        {
            try
            {
                XmlDocument xmldoc = new XmlDocument();
                xmldoc.Load(pathstring);
                XmlNodeList rootnode = xmldoc.DocumentElement.ChildNodes;
           //     XmlNodeList xmlnodel = rootnode.ChildNodes;

                foreach (XmlNode xn in rootnode)
                {
                    if (xn.Name.ToString() == "INVOICE_CUSTOMER_INFO")
                        xn.InnerText = "CUSTOMER_CODE~~CUSTOMER_NAME~~CUSTOMER_MNE~~CUSTOMER_TAX~~CUSTOMER_ADDRESS~~CUSTOMER_BANK~~~~CUSTOMER_NOTES~~";
                    if (xn.Name.ToString()=="INVOICE_PRODUCT_INFO")
                        xn.InnerText = "ITEM_CODE~~ITEM_NAME~~ITEM_MNE~~TAX_NB~~TAX_RATE~~ITEM_STAND~~ITEM_UNIT~~ITEM_PRICE~~TAX_FLAG~~~~~~GOODSTAXNO~~~~~~~~~~";
                 

                }
                xmldoc.Save(pathstring);
               // return "";
                }
                catch (Exception e)
                {
                    StreamWriter sw = new StreamWriter(Application.StartupPath + "log.txt", true);
                    sw.Write(System.DateTime.Now.ToString("yyyMMddddss") + "   " + e.ToString());
                    sw.Close();

                }
           
         }