// <summary>          ///  实体类序列化成xml          /// </summary>          /// <param name="enitities">实体.</param>          /// <param name="headtag">节点名称</param>          /// <returns></returns>          public static string ObjListToXml<T>(List<T> enitities, string headtag)        {            StringBuilder sb = new StringBuilder();            System.Reflection.PropertyInfo[] propinfos = null;            sb.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");            sb.AppendLine("<" + headtag + ">");            foreach (T obj in enitities)            {                //初始化propertyinfo                  if (propinfos == null)                {                    Type objtype = obj.GetType();                    propinfos = objtype.GetProperties();                }                sb.AppendLine("<item>");                foreach (System.Reflection.PropertyInfo propinfo in propinfos)                {                    sb.Append("<");                    sb.Append(propinfo.Name);                    sb.Append(">");                    sb.Append(propinfo.GetValue(obj, null));                    sb.Append("</");                    sb.Append(propinfo.Name);                    sb.AppendLine(">");                }                sb.AppendLine("</item>");            }            sb.AppendLine("</" + headtag + ">");            return sb.ToString();        }        /// <summary>          /// xml文件转化为实体类列表          /// </summary>          /// <typeparam name="T">实体名称</typeparam>          /// <param name="xml">您的xml文件</param>          /// <param name="headtag">xml头文件</param>          /// <returns>实体列表</returns>          public static List<T> XmlToObjList<T>(string xml, string headtag)            where T : new()        {            List<T> list = new List<T>();            System.Xml.XmlDocument doc = new System.Xml.XmlDocument();            System.Reflection.PropertyInfo[] propinfos = null;            doc.LoadXml(xml);            System.Xml.XmlNodeList nodelist = doc.GetElementsByTagName(headtag);            foreach (System.Xml.XmlNode node in nodelist)            {                T entity = new T();                //初始化propertyinfo                  if (propinfos == null)                {                    Type objtype = entity.GetType();                    propinfos = objtype.GetProperties();                }                //填充entity类的属性                  foreach (System.Reflection.PropertyInfo propinfo in propinfos)                {                    //实体类字段首字母变成小写的                      string name = propinfo.Name.Substring(0, 1) + propinfo.Name.Substring(1, propinfo.Name.Length - 1);                    System.Xml.XmlNode cnode = node.SelectSingleNode(name);                    string v = cnode.InnerText;                    if (v != null)                        propinfo.SetValue(entity, Convert.ChangeType(v, propinfo.PropertyType), null);                }                list.Add(entity);            }            return list;        }