来自PostAsync的HttpPost始终为null

时间:2018-06-30 01:58:18

标签: c# asp.net-core

我要努力弄清楚如何将POST参数传递给ASPNET CORE 2.0中的Web API方法。

我有一个C#客户端应用程序和一个C#服务器应用程序。

  • 我尝试在Web Api方法上使用[FromBody]。
  • 我尝试将内容类型设置为“ application / json”
  • 我已将控制器操作简化为尽可能基本
  • 我尝试同时传递字符串和复杂对象。

它总是为空。发生了什么事?

客户代码

private static async Task SendCustomObject()
{
    var controllerName = "BasicApi";
    var basicClientApi = string.Format("http://localhost:5100/api/{0}", controllerName);

    using (var httpClient = new HttpClient()){

        var packetData = new TestPacket();
        var jsonObj = new { json = packetData };
        JObject jobject = JObject.FromObject(packetData);

        var json = JsonConvert.SerializeObject(jobject);
        var content = new StringContent(json, Encoding.UTF8, "application/json");
        content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

        // This doesn't help:
        //httpClient.DefaultRequestHeaders.Accept.Clear();
        //httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

        var response = await httpClient.PostAsync(basicClientApi, content);                    

        if (!response.IsSuccessStatusCode)
        {
            Console.WriteLine(response.StatusCode);
        }
        else
        {
            var rawResponse = await response.Content.ReadAsStringAsync();                        

            JObject o = JObject.Parse(rawResponse);
            Console.WriteLine(o.ToString());    
        }
    }
}

服务器代码:

namespace myApp.Controllers
{
    [Route("api/[controller]")]
    public class BasicApiController : Controller
    {    

      [HttpPost]    
      public JsonResult Post([FromBody] string json) // json is always null!
      {                

        var jsonData = JsonConvert.DeserializeObject<Models.TestPacket>(json);
        return Json(new { result = true });

      }
    }
 }

1 个答案:

答案 0 :(得分:2)

ASP.NET Core默认绑定程序为您反序列化模型,您无需手动进行。具体来说,您不能将update视为object

看看这个简单得多的示例:

string