可以使用开源的类库Newtonsoft.Json。

例如解析如下

string json =
{
"result": "ok", // ret 值为 ok 时 返回 data 数据 为err时返回msg数据
"data": [
"ava", /
"ben",
"ccc",
"ddd",
]
};

函数如下

public string cutJson(string json,string item,int index)
{
JObject jo = (JObject)JsonConvert.DeserializeObject(json);
string value = jo[item][index].ToString();
return value;
}

其中item表示为Json中的key(名称), index表示某个item对应的value(值对)中的特定项

拓展：

Api接口接受Post过来的查询条件并返回数据

Post查询条件 （用Postman放在Body里调试）

{
"PN": "ABCDEFGHIJ-00",
"cuPNList": [
{
"cuPN": "9A200000000000000"
} ,
{
"cuPN": "900000000030000"
}
]
}

Api接口

 1 [HttpGet]
 2 [Route("api/GetLotCardMIMAFInfo")]
 3 public HttpResponseMessage GetLotCardMIMAFInfo()
 4 {
 5 var data = Request.Content.ReadAsStringAsync().Result; 
 6 var PNlist = "";
 7 JObject jsonObj = JObject.Parse(data);
 8 string PNno = jsonObj["PN"].ToString();
 9 
10 JArray jsonAry = JArray.Parse(jsonObj["cuPNList"].ToString());
11 JObject stu1Obj = JObject.Parse(jsonAry[0].ToString());
12 string cuPN = stu1Obj["cuPN"].ToString();
13 foreach (var ss in jsonAry) //查找某个字段与值
14 {
15 PNlist = PNlist + ss["cuPN"].ToString() + ","; // ((JObject)ss)["cuPN"]; // JObject.Parse(jsonAry[0].ToString());
16 } 
17 JsonData jd = new JsonData();
18 //JavaScriptSerializer js = new JavaScriptSerializer();
19 //var resultqq = JsonConvert.DeserializeObject<List<PNitem>>(cuPNList);
20 //List<PNitem> lst = js.Deserialize<List<PNitem>>(cuPNList);
21 //var PNlist = "";
22 //for (int i = 0; i < lst.Count; i++)
23 //{
24 // PNlist = PNlist + lst[i].cuPN +",";
25 //} 
26 DataTable dt = checkInplanservice.GettLotCardInfoTable(PNno);
27 DataTable dtMAF = checkInplanservice.GettLotCardMAFInfoTable(PNlist);
28 //OBJ转化成JSON
29 jd.Status = HandleStatus.Success;
30 jd.Data = new
31 {
32 cuLayerType = dt.Rows[0]["LayerLevel"],
33 cuCustomer = dt.Rows[0]["MiCustPn"],
34 cuCustomerName = dt.Rows[0]["MiCustName"],
35 cuQRCustomerPN = "",
36 cuQRCustomerPNVersion = "",
37 cuPNLOrigin = dt.Rows[0]["lvdr"],
38 cuSize = dt.Rows[0]["Value"],
39 cuCurrSize = dt.Rows[0]["MiSetArea"],
40 cuHSFRequirement = dt.Rows[0]["AttrCode"],
41 cuPNList = dtMAF,
42 test= new[] {new {Name ="Tom",Age=30},
43 new {Name ="Lily", Age=22}}
44 };
45 string msgAll = JsonConvert.SerializeObject(jd);
46 return JsonResult(msgAll);
47 
48 
49 //string json = JsonConvert.SerializeObject(dt); 
50 ////返回json数
51 //return new HttpResponseMessage()
52 //{
53 // Content = new StringContent(json, Encoding.UTF8, "application/json"),
54 //};
55 
56 }

public static void InterfaceSendDingDMsg()
{
string url = "https://api.***.com/v1.0/oauth2/accessToken"; //得到Token
var ss = "{ \"appKey\": \"dingupyuer\",\"appSecret\":\"neEVCiC386pb-9qdms_OumL575doYemAvrdo2DifGxpoBCxDXKWZHaRTccLB7ay0\"}";
var r = Multek.Net.Request.Send(url, HttpMethod.POST, ss);
//r值为：{"expireIn":7200,"accessToken":"b80d72b96e793dd7a53da1992ab63606"}
if (r.Success)
{
dynamic obj = r.Data.ToString().ToDynamicObject();
var objd = obj as dynamic;
string accToken = objd.accessToken;
string url2 = "https://oapi.***.com/topapi/message/corpconversation/asyncsend_v2?access_token=" + accToken;
var v = new
{
msg = new { text = new { content = "IT 测试" + "[" + System.DateTime.Now.ToLongTimeString() + "]" }, msgtype = "text" },
to_all_user = false,
agent_id = "1467996111",
userid_list = "6526336"
};
var datajson2 = JsonConvert.SerializeObject(v);
var body = JsonConvert.SerializeObject(v);
var returnResult = Request.Send(url2, HttpMethod.POST, body);
//returnResult值为：
//{
// Success: True
// Errors:
// Data:
// { "errcode":0,"errmsg":"ok","task_id":524736452565,"request_id":"2t0mcdllqgs6"}
//}
if (returnResult.Success)
{
JObject jsonObj = JObject.Parse(returnResult.Data.ToString());
string errmsg = jsonObj["errmsg"].ToString();
}
Console.ReadLine();
}
}