HTTP POST请求方法未执行。如何使用httpclient？

Question

我正在尝试使用httpclient提出发布请求。我要发布的预期JSON存储在var Result中，看起来像：

{
  "ID": 142,
  "StationNo": 19,
  "RunTime": 1800,
  "ControllerID": 4,
  "ControllerAddress": 2,
  "ProgramNo": 5,
  "ModeID": "AutoProgram",
  "EventDate": "2022-04-27T22:30:02",
  "Description": "Irrigation Completed",
  "MessageCode": 5,
  "time": "2022-05-06T08:58:41.322Z",
  "source": {
    "id": "43432088"
  },
  "type": "c8y_Golf_Controller",
  "text": "PilotCC Data New Msg"
}

foreach循环运行4次迭代，但没有成功的请求。它只是什么都没有回应。我已经在Postman中测试了上述JSON，在那里工作正常。

这是我的示例代码：

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Net.Http.Headers;
using System.Net.Http;
using System.Text;
using System.Net.Mime;
using System.Net.Http.Json;



namespace ObjFromJson
{
    public class Program
    {
        static async Task Main(string[] args)
        {

            string json = @"{
            'Values': [
                {
                    'MsgSource': null,
                    'TagName': 'Data.New_MSG',
                    'RawValue': '[\r\n  {\r\n    \'ID\': 145,\r\n    \'StationNo\': 6,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 2,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T23:30:02\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  },\r\n  {\r\n    \'ID\': 144,\r\n    \'StationNo\': 18,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 5,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T22:00:00\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  },\r\n  {\r\n    \'ID\': 143,\r\n    \'StationNo\': 15,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 4,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T22:00:02\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  },\r\n  {\r\n    \'ID\': 142,\r\n    \'StationNo\': 19,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 5,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T22:30:02\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  }\r\n]',
                    'ScaledValue': '[\r\n  {\r\n    \'ID\': 145,\r\n    \'StationNo\': 6,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 2,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T23:30:02\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  },\r\n  {\r\n    \'ID\': 144,\r\n    \'StationNo\': 18,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 5,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T22:00:00\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  },\r\n  {\r\n    \'ID\': 143,\r\n    \'StationNo\': 15,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 4,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T22:00:02\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  },\r\n  {\r\n    \'ID\': 142,\r\n    \'StationNo\': 19,\r\n    \'RunTime\': 1800,\r\n    \'ControllerID\': 4,\r\n    \'ControllerAddress\': 2,\r\n    \'ProgramNo\': 5,\r\n    \'ModeID\': \'AutoProgram\',\r\n    \'EventDate\': \'2022-04-27T22:30:02\',\r\n    \'Description\': \'Irrigation Completed\',\r\n    \'MessageCode\': 5\r\n  }\r\n]',
                    'Status': 'Normal',
                    'ComStatus': null,
                    'TimeStamp': '2022-04-28 13:17:39.851'
                }
                ]
            }";
            Root root = JsonConvert.DeserializeObject<Root>(json);
            string rawValue = root.Values[0].RawValue;
            JArray array = JArray.Parse(rawValue);
            string isoTime = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.fffZ");
            string json2 =    $"{{\"time\": \"{isoTime}\",\"source\": {{\"id\": \"43432088\" }},\"type\": \"c8y_Golf_Controller\",\"text\": \"PilotCC Data New Msg\"}}";
            JObject json3 = JObject.Parse(json2);
            var result = new JObject();
            foreach(var item in array)
            {
                result.Merge(item);
                result.Merge(json3);
                
                using (var client = new HttpClient())
                {
                    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic","base64authvalue");
                    
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/vnd.com.nsn.cumulocity.event+json"));
                    JsonContent myContent = JsonContent.Create(result);
                    HttpResponseMessage response = await client.PostAsync("https://myurl.com", myContent);
                    var responseString = await response.Content.ReadAsStringAsync();
                    Console.WriteLine(responseString);
                }
             
            }

        }
        
        public class Root
        {
            public List<Value> Values {get; set;}
        }
        public class Value
        {
            public string RawValue { get; set; }
        }       
    }   
}

编辑：添加console.write（（int）wrespons.statuscode）;在 console.writeline（响应格林）;及其返回错误代码：415

在提出请求时几乎没有重要的事情：

The Content-Type must be "application/json"

It must have Accept header with value as "application/vnd.com.nsn.cumulocity.event+json"

Basic auth must be used

我正在掌握所有这些内容和JSON 变量结果也以正确的格式（在邮递员中进行了测试），那么我在这里还缺少什么？

Answer 1

有了更多的研究，一整天都在完成这项工作之后，我终于能够完成它。
至于我在这里提出的这个特定问题，这是因为内容类型变为application/json； charset = UTF-8可能会引起不支持的媒体类型错误。

我添加了字符串JSON4 = JSONCONVERT.SerializeObject（result）; result.merge（json3）; in foreach loop中的行并更换了行jsoncontent mycontent = jsoncontent。创建（结果）;带有var StringContent = new StringContent（JSON4，ENCODING.UTF8，MEDIATYPENAMES.APPLICATION.JSON）; StringContent.Headers.ContentType.Charset =“”;

这将从您的内容类型标题中删除charset。