纠结了两天的json数组反序列化，终于在同事的帮助下，找到方法了，特作笔记如下：
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Text; string jsonText = "[{'a':'aaa','b':'bbb','c':'ccc'},{'a':'aaa2','b':'bbb2','c':'ccc2'}]";
JArray ja = (JArray)JsonConvert.DeserializeObject(ReceivePlaceString);
// JObject o = (JObject)ja[1];
// Response.Write(o["a"]);
Response.Write(ja[0]["a"]);