/// <summary>
        /// 将datatable转换为json  
        /// </summary>
        /// <param name="dtb">Dt</param>
        /// <returns>JSON字符串</returns>
        private string Dtb2Json(DataTable dtb)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            System.Collections.ArrayList dic = new System.Collections.ArrayList();
            foreach (DataRow dr in dtb.Rows)
            {
                System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
                foreach (DataColumn dc in dtb.Columns)
                {
                    drow.Add(dc.ColumnName, dr[dc.ColumnName]);
                }
                dic.Add(drow);

            }
            //序列化  
            return jss.Serialize(dic);
        }

------解决方案--------------------
public class JsonHelper
   {
       /// <summary>
       /// 生成Json格式
       /// </summary>
       /// <typeparam name="T"></typeparam>
       /// <param name="obj"></param>
       /// <returns></returns>
       public static string GetJson<T>(T obj)
       {
           DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType());
           using (MemoryStream stream = new MemoryStream())
           {
               json.WriteObject(stream, obj);
               string szJson = Encoding.UTF8.GetString(stream.ToArray());
               return szJson;
           }
       }
       /// <summary>
       /// 获取Json的Model
       /// </summary>
       /// <typeparam name="T"></typeparam>
       /// <param name="szJson"></param>
       /// <returns></returns>
       public static T ParseFromJson<T>(string szJson)
       {
           T obj = Activator.CreateInstance<T>();
           using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson)))
           {
               DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
               return (T)serializer.ReadObject(ms);
           }
       }


------解决方案--------------------
GetJson 将传入 类对象转化成字符串
ParseFromJson 将 josn字符串转化 成 对象