xml 操作（动态添加 property属性 其他节点同理）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Linq;
using System.Xml.Linq;
using System.Xml;

namespace ConsoleApplication27
{
    class Program
    {
        static void Main(string[] args)
        {

            var folderPath = AppDomain.CurrentDomain.BaseDirectory + "..\\..\\Mapping";
            var files = System.IO.Directory.GetFiles(folderPath);
            foreach (string file in files)
            {

                var path = file; //AppDomain.CurrentDomain.BaseDirectory + "..\\..\\Mapping\\PosPositionProductMapping.hbm.xml";
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                var plist = doc.GetElementsByTagName("property");

                bool find1 = false;
                bool find2 = false;
                foreach (XmlNode item in plist)
                {

                    if (find1 == false)
                        find1 = item.Attributes["column"].Value.ToLower().Contains("CREATED_EMPLOYEE_NAME".ToLower());
                    if (find2 == false)
                        find2 = item.Attributes["column"].Value.ToLower().Contains("CREATED_EMPLOYEE_ID".ToLower());

                }
                var cls = doc.GetElementsByTagName("class")[0];
                if (find1 == false)
                {
                    var e1 = doc.CreateElement("property", doc.DocumentElement.NamespaceURI);
                    e1.SetAttribute("column", "CREATED_EMPLOYEE_NAME");
                    e1.SetAttribute("name", "CreatedEmployeeName");
                    e1.SetAttribute("update", "false");
                    cls.AppendChild(e1);
                }
                if (find2 == false)
                {
                    var e2 = doc.CreateElement("property", doc.DocumentElement.NamespaceURI);
                    e2.SetAttribute("column", "CREATED_EMPLOYEE_ID");
                    e2.SetAttribute("name", "CreatedEmployeeId");
                    e2.SetAttribute("update", "false");
                    cls.AppendChild(e2);
                }
                doc.Save(path);
            }

        }
    }
}