{
    "responseCode": "100000",
    "message": "运行正确",
    "result": {
        "pageNum": 1,
        "pageSize": 10,
        "size": 10,
        "startRow": 1,
        "endRow": 10,
        "total": 27,
        "pages": 3,
        "list": [
            {
                "id": "7bcba4b7508a433db7664ec9f60fef2a",
                "registTime": "2019-07-01 23:49:17",
                "updateTime": "2019-07-01 23:49:48",
                "gmId": "9999999000008888",
                "concentratorNum": "",
                "deviceType": "",
                "subdeviceType": "",
                "anysType": 0,
                "port": 0,
                "ip": "",
                "msgJsoncontent": "{\"identifier\":\"9000008888\",\"hasMore\":0,\"mid\":598,\"msgType\":\"deviceReq\",\"data\":[{\"serviceId\":\"GeneralReportInfo\",\"serviceData\":{\"dfCount\":\"0\",\"dfId\":\"0\",\"connType\":\"0\",\"deviceType\":\"2\",\"subDeviceType\":\"12\",\"companyNo\":\"999999\",\"meterType\":\"0000\",\"dataType\":\"00\",\"totalUseValue\":\"7.90\",\"recentFreezeValue\":\"7.90\",\"deviceStatus\":{\"loseTrack\":\"0\",\"valueLack\":\"0\",\"leakAlarm\":\"0\",\"remoteCloseValve\":\"1\",\"vibrationStop\":\"0\",\"buttonMode\":\"0\",\"deviceLock\":\"0\",\"isAccount\":\"1\",\"breakLine\":\"0\",\"singleCount\":\"0\",\"magneticInterference\":\"0\",\"superFlow\":\"0\",\"factoryMode\":\"1\",\"pressureLack\":\"0\",\"valveState\":\"1\"},\"deviceTime\":\"20190701T234910Z\",\"voltage\":\"4.91\",\"identityCode\":\"89860317492039663768\",\"moduleIMEI\":\"863703038784190\",\"signalIntensity\":\"2\",\"signalStrength\":-1194,\"signalPower\":-1088,\"signalCellID\":163869138,\"signalECL\":1,\"signalSNR\":7,\"signalPCI\":295,\"linkQuality\":-136,\"softWareVer\":\"9\",\"firmwareVer\":\"R2027\"}},{\"serviceId\":\"FreezeDataReportInfo\",\"serviceData\":{\"dfCount\":\"0\",\"dfId\":\"0\",\"connType\":\"0\",\"deviceType\":\"2\",\"subDeviceType\":\"12\",\"companyNo\":\"999999\",\"freezeCount\":\"0\",\"freezeDatas\":null}}]}",
                "msgContent": "BB01025602080C9999999000008888000000006000A8B670678C9E3DC24A5CF51A67E0003E8C6F3CF513378103CF2B221B965DCA91F5DD1A7834337C1FA61DE71B04CC54F916701A5A77CF0544A2FEACA2DD6942BBB9718B7CDF5EAF5B2E63A5FE28E3794644F3EEA39D6CAD30A08199991C43DC25626C",
                "hasTestHang": 0,
                "callbackResult": 1,
                "msgDeviceType": 0,
                "linkType": 0
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            {
                "id": "e33b54d057c34f10bfecfe55d2e9684d",
                "registTime": "2019-07-01 15:49:11",
                "updateTime": "2019-07-01 15:49:12",
                "gmId": "9999999000008888",
                "concentratorNum": "",
                "deviceType": "",
                "subdeviceType": "",
                "anysType": 0,
                "port": 0,
                "ip": "",
                "msgJsoncontent": "{\"identifier\":\"9000008888\",\"hasMore\":0,\"mid\":586,\"msgType\":\"deviceReq\",\"data\":[{\"serviceId\":\"GeneralReportInfo\",\"serviceData\":{\"dfCount\":\"0\",\"dfId\":\"0\",\"connType\":\"0\",\"deviceType\":\"2\",\"subDeviceType\":\"12\",\"companyNo\":\"999999\",\"meterType\":\"0000\",\"dataType\":\"00\",\"totalUseValue\":\"7.90\",\"recentFreezeValue\":\"7.90\",\"deviceStatus\":{\"loseTrack\":\"0\",\"valueLack\":\"0\",\"leakAlarm\":\"0\",\"remoteCloseValve\":\"1\",\"vibrationStop\":\"0\",\"buttonMode\":\"0\",\"deviceLock\":\"0\",\"isAccount\":\"1\",\"breakLine\":\"0\",\"singleCount\":\"0\",\"magneticInterference\":\"0\",\"superFlow\":\"0\",\"factoryMode\":\"1\",\"pressureLack\":\"0\",\"valveState\":\"1\"},\"deviceTime\":\"20190701T154905Z\",\"voltage\":\"5.39\",\"identityCode\":\"89860317492039663768\",\"moduleIMEI\":\"863703038784190\",\"signalIntensity\":\"3\",\"signalStrength\":-1139,\"signalPower\":-1069,\"signalCellID\":80010836,\"signalECL\":1,\"signalSNR\":93,\"signalPCI\":183,\"linkQuality\":-111,\"softWareVer\":\"9\",\"firmwareVer\":\"R2027\"}},{\"serviceId\":\"FreezeDataReportInfo\",\"serviceData\":{\"dfCount\":\"0\",\"dfId\":\"0\",\"connType\":\"0\",\"deviceType\":\"2\",\"subDeviceType\":\"12\",\"companyNo\":\"999999\",\"freezeCount\":\"1\",\"freezeDatas\":[{\"freezeDate\":\"20190701T150000Z\",\"freezeValue\":\"7.90\"}]}}]}",
                "msgContent": "BB01024A02080C9999999000008888000000006000544E03707B118B43F50857CFED37915A97599E43DD2E90FDD58B0D41820A81DD7390E567D81CD14E5ACF7330A1238A89141DB5F37AD1C70876BE7DA16F50BB85FA930EA0E8D1DDABFB8F91528D762A55B706CFC565D19B8C75B333D6FFE81F7FAB4E",
                "hasTestHang": 0,
                "callbackResult": 1,
                "msgDeviceType": 0,
                "linkType": 0
            }
        ],
        "firstPage": 1,
        "prePage": 0,
        "nextPage": 2,
        "lastPage": 3,
        "isFirstPage": true,
        "isLastPage": false,
        "hasPreviousPage": false,
        "hasNextPage": true,
        "navigatePages": 8,
        "navigatepageNums": [1, 2, 3]
    },
    "args": ""
}

第一步：

responsecontent为上文的文件

将JSON字符串JObject格式化：JObject job = JObject.Parse(responsecontent);

第二步：

将list里面的数据Jarray化： JArray array2 = JArray.Parse(job["result"]["list"].ToString());

循环array2得到我们想要的数据，命名比较随意请见谅，以下是具体的解析代码：

for (int j = 0; j < array2.Count; j++)
{
    dr = dt.NewRow();
    JObject jObject = JObject.Parse(array2[j].ToString());
    string ss = jObject["msgJsoncontent"].ToString();
    JObject js = JObject.Parse(ss);
    string sss = js["data"].ToString();
    JArray array = JArray.Parse(sss);
    // 通过LINQ表达式选择data里面serviceId=GeneralReportInfo再获取下面的totalUseValue值
    foreach (var item in array.Where(a => a["serviceId"].ToString() == "GeneralReportInfo"))
    {
        JObject a = JObject.Parse(item["serviceData"].ToString());
        string totalUseValue = a["totalUseValue"].ToString(); // 此处我们就得到了我们想要的数据
    }
}