Question

我有以下Web API 2.0调用：

 [System.Web.Http.Route("api/createuser")]
 [System.Web.Http.HttpPost]
 public async Task<IHttpActionResult> CreateUser([FromBody] WDUser value)
 {
     var user = value;

     if (string.IsNullOrEmpty(user.Email))
     {
         throw new ProcessException($"Email is blank.");                
     }
     return Ok("all good");
 }

ProcessException很简单：

internal class ProcessException : Exception
{
    public ProcessException()
    {
    }

    public ProcessException(string message) : base(message)
    {
    }
 }

我这样称呼我的api：

  using (var client = new HttpClient())
  {
      client.BaseAddress = new Uri("http://localhost:49352/");
      client.DefaultRequestHeaders.Accept.Clear();
      client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));


      var departmentPost = new WDUser() { Email= "" };
      HttpResponseMessage responsePost = client.PostAsJsonAsync("api/createuser", departmentPost).Result;
      if (responsePost.IsSuccessStatusCode)
      {
          // Get the URI of the created resource.
          Uri returnUrl = responsePost.Headers.Location;
          Console.WriteLine(returnUrl);
      }
  }

如果我提供电子邮件，则API会返回正常状态。如您所见，我故意将电子邮件留空。我进行API调用并返回错误，但我找不到消息＆＃34;电子邮件是空白＆＃34;
如何检索从API返回的错误消息？

Answer 1

试试这个：

if (responsePost.IsSuccessStatusCode)
{
     // Get the URI of the created resource.
     Uri returnUrl = responsePost.Headers.Location;
     Console.WriteLine(returnUrl);
}
else
{
    string content = response.Content.ReadAsStringAsync().Result;
    Console.WriteLine(content);
}

读取API返回的异常... C＃

1 个答案: