如何在Controller

Question

我正在尝试将POST的值ASP NET Core Controller。 Controller不断获得null的值，我不明白为什么。

发送请求

 string uri = "/api/create";
//some POCO--not important 
  CampaignRequest<CreateCampaignParams> req = new 
  CampaignRequest<CreateCampaignParams> { Data = campaignParams, Ticket = this.ticket };

  var content = new StringContent(JsonConvert.SerializeObject(req), Encoding.UTF8, "application/json");
  var response = await this.http.PostAsync(uri, content);

接收器

   [HttpPost]
   [Route("api/create")]
   public async Task<long> CreateAsync([FromBody]CampaignRequest<CreateCampaignParams>pars)
   {
    //--- the received argument is null...i have tried putting as a string argument to no avail
      try
      {
        var client = new CampaignClient(uri,pars.Ticket.Value);
        long rez=await client.CreateCampaignAsync(pars.Data);
        return rez;   
      }
      catch (Exception)
      {
        return 0;
      }
}

我尝试将Controller方法的参数设置为字符串，然后反序列化。仍然字符串为空。
如何在控制器中检索StringContent？

Answer 1

最可能的原因是模型绑定错误。

要对此进行检查，请按如下所示修改您的控制器方法：

[HttpPost]
[Route("api/create")]
public async Task<long> CreateAsync([FromBody]CampaignRequest<CreateCampaignParams> pars)
{
     var errorCount = ModelState.ErrorCount;

并在该errorCount行上设置一个断点，如果计数> 0，则进一步检查ModelState对象是否存在特定错误。

此外，您确定您的POST请求已使用F12浏览器工具将对象正确添加到主体中。如果不确定，请附上截图。