/// <summary>
        /// Serialize object to string of json format
        /// </summary>
        private string JsonSerializer<T>(T t)
        {
            var ser = new DataContractJsonSerializer(typeof(T));
            var ms = new MemoryStream();
            ser.WriteObject(ms, t);
            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            return jsonString;
        }

        /// <summary>
        /// Deserialize string of json format to object
        /// </summary>
        private T JsonDeserialize<T>(string jsonString)
        {
            var ser = new DataContractJsonSerializer(typeof(T));
            var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            var obj = (T)ser.ReadObject(ms);
            return obj;
        }

------解决方案--------------------
public static string ToJson(object obj)
{
           System.Web.Script.Serialization.JavaScriptSerializer javaSer = new System.Web.Script.Serialization.JavaScriptSerializer();
           return javaSer.Serialize(obj);
}

------解决方案--------------------
把数据保存在ilist中.遍历ilist.
stringbuilder str=new stringbuilder（"[{"）;
str.append("")//你的操作.
...
...
...
str.append("}]");
接着str.ToString();


------解决方案--------------------
System.Web.Script.Serialization.JavaScriptSerializer


直接把你的实体类转化为json