使用Json对象的C#HttpClient Post失败

Question

问题声明：

我试图使用JSON数据将数据发布到C#中的测试url，但失败了，但当我在Postman中尝试同样的操作时，它成功了。

C#代码片段

string uploadPath = @"https://api.test.com/test";
string jsonData = "{ "message":"ERROR: ABCDEXY: Price"," +
""source":"BYODB"," +
""tag":["ABXT","I232-F103"],"ID":"{76573406E8}"}";
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.Add("Authorization", "apiKey " + "7cbafstad-677654c4-8765fgt-95deb");
var content= new StringContent(jsonData, Encoding.UTF8, "application/json");
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
HttpResponseMessage response = client.PostAsync(uploadPath, content).Result;
var responseBody = response.Content.ReadAsStringAsync().Result;
if (response.IsSuccessStatusCode)
{
var sucessRes = JsonConvert.DeserializeObject<dynamic>(responseBody);
//Print Success Msg
}
else
{
var failureRes = JsonConvert.DeserializeObject<dynamic>(responseBody);
//Print Failure Msg
}
}

异常详细信息：

对于响应对象，我正在接收：

response = {StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Transfer-Encoding: chunked
Connection: keep-alive
X-Response-Time: 0.001
X-Request-ID: 4514d1b-1a3f-4277-9997-2813cd9d28ed
X-Rat...

对于响应体，我正在接收：

{"message":"Invalid JSON","took":0.001,"requestId":"4514d1b-1a3f-4277-9997-2813cd9d28ed"}

当我试图通过邮递员调用此项时，它成功了：

我在C#JSON帖子中做错了什么

Answer 1

最好的方法是使用实际对象，并让NewtonsoftJson负责序列化。

你需要两个nuget包：

1. Microsoft.AspNet.WebApi.Client
2. Newtonsoft.Json

代码如下：

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
namespace Custom.ApiClient
{
internal static class WebApiManager
{
//private const string _requestHeaderBearer = "Bearer";
private const string _responseFormat = "application/json";
private static readonly HttpClient _client;
static WebApiManager()
{
// Setup the client.
_client = new HttpClient { BaseAddress = new Uri("api url goes here"), Timeout = new TimeSpan(0, 0, 0, 0, -1) };
_client.DefaultRequestHeaders.Accept.Clear();
_client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(_responseFormat));
// Add the API Bearer token identifier for this application.
//_client.DefaultRequestHeaders.Add(RequestHeaderBearer, ConfigHelper.ApiBearerToken);       
}
public static async Task<T> Post<T>(object requestObject)
{//the request object is the object being sent as instance of a class
var response = _client.PostAsJsonAsync("api extra path and query params go here", requestObject);
return await ProcessResponse<T>(response);
}
private static async Task<T> ProcessResponse<T>(Task<HttpResponseMessage> responseTask)
{//T represents the respose you expect from this call
var httpResponse = await responseTask;
if(!httpResponse.IsSuccessStatusCode)
throw new HttpRequestException(httpResponse.ToString());
var dataResult = await httpResponse.Content.ReadAsAsync<T>();
return dataResult;
}
}
}

要使用此代码，您需要执行以下操作：

var myObject = new Object_I_Want_To_Send();
//set some properties here
var response = await WebApiManager.Post<MyResponse>(myObject);