实体类转XML（XML转实体类）操作

要转换的实体类如下：

 public class OrderGoodInfo
    {
        private int _type;
        private int _goodid;
        private int _number;
        private string _name;
        private decimal _price;

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
       

        public int Type
        {
            get { return _type; }
            set { _type = value; }
        }

        public int GoodId
        {
            get { return _goodid; }
            set { _goodid = value; }
        }

        public int Number
        {
            get { return _number; }
            set { _number = value; }
        }

        public decimal Price
        {
            get { return _price; }
            set { _price = value; }
        }
    }

 #region 实体类，XML互操作
        /// <summary>
        ///  实体类序列化成xml
        /// </summary>
        /// <param name="enitities">The enitities.</param>
        /// <param name="headtag">The headtag.</param>
        /// <returns></returns>
        public static string ObjListToXml<T>(List<T> enitities, string headtag)
        {
            StringBuilder sb = new StringBuilder();
            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 (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>
        ///  使用XML初始化实体类容器
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="typename">The typename.</param>
        /// <param name="xml">The XML.</param>
        /// <param name="headtag">The headtag.</param>
        /// <returns></returns>
        public static List<T> XmlToObjList<T>(string xml,string headtag)
            where T : new()
        {
            List<T> list = new List<T>();
            XmlDocument doc = new XmlDocument();
            PropertyInfo[] propinfos = null;
            doc.LoadXml(xml);
            XmlNodeList nodelist = doc.SelectNodes("/" + headtag + "/item");
            foreach (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 (PropertyInfo propinfo in propinfos)
                {
                    XmlNode cnode = node.SelectSingleNode(propinfo.Name);
                    string v = cnode.InnerText;
                    if (v != null)
                        propinfo.SetValue(entity, Convert.ChangeType(v, propinfo.PropertyType), null);
                }
                list.Add(entity);
            }
            return list;
        }

        #endregion
    }
使用如下：

protected void Page_Load(object sender, EventArgs e)
    {
        OrderGoodInfo good1 = new OrderGoodInfo();
        good1.GoodId = 1;
        good1.Number = 1;
        good1.Price = 100;
        good1.Type = 1;

        OrderGoodInfo good2= new OrderGoodInfo();
        good2.GoodId = 2;
        good2.Number = 2;
        good2.Price = 200;
        good2.Type = 2;

        List<OrderGoodInfo> list = new List<OrderGoodInfo>();
        list.Add(good1);
        list.Add(good2);
       
        string xmlstr = XmlHelper.ObjListToXml(list, "goods");
        Response.Write(xmlstr);

        List<OrderGoodInfo> nlist = XmlHelper.XmlToObjList<OrderGoodInfo>(xmlstr, "goods");

        Response.Write(XmlHelper.ObjListToXml(nlist, "goods"));
    }