如何獲取StatusCodes.Status204NoContent上的訊息

我的控制器中有這個：

[

HttpPost]
        public async Task<ActionResult> UpdateCalendarEntry(CalendarEntry model)
        {
            try
            {
                model.LabelColor = "blue";
                var result = await repo.AddCalendarEntry(model);
                if(result == null)
                {
                    return StatusCode(StatusCodes.Status204NoContent, "Cannot Do It!");
                }
                return apiResult.Send200(result);
            }
            catch (Exception ex)
            {

                return apiResult.Send400(ex.Message);
            }
        }

我在 Blazor WASM 的服務中得到回應，如下所示：

using var response = await httpClient.SendAsync(request);
            var content = await response.Content.ReadAsStringAsync();

            // auto logout on 401 response
            if (response.StatusCode == HttpStatusCode.Unauthorized)
            {
                navigationManager.NavigateTo("login");
                return default;
            }

            if(response.StatusCode == HttpStatusCode.BadRequest)
            {
                await helperService.InvokeAlert("Bad Request", $@"{response.ReasonPhrase}", true);
            }

            if(response.StatusCode == HttpStatusCode.NoContent)
            {
                var x = response.Content.ReadAsStringAsync();
                await helperService.InvokeAlert("Bad Request", $@"{response.ReasonPhrase}", true);
            }

            // throw exception on error response
            if (!response.IsSuccessStatusCode)
            {
                //var error = await response.Content.ReadFromJsonAsync<Dictionary<string, string>>();
                //throw new (error["message"]);

                return default;
                //throw new ApplicationException
                //    ($"The response from the server was not successful: {response.ReasonPhrase}, "  
                //    $"Message: {content}");
            }

我需要從控制器收到“無內容”訊息“無法做到！”的回復。我正在嘗試 ReasonPhrase，但我不知道如何將錯誤放在那里。

uj5u.com熱心網友回復：

警告，未測驗。

[HttpPost]
public async Task<ActionResult> UpdateCalendarEntry(CalendarEntry model)
{
      try
      {
            model.LabelColor = "blue";
            var result = await repo.AddCalendarEntry(model);
            if(result == null)
            {
                 return new ObjectResult("Cannot Do It!")
                 {
                      StatusCode = HttpStatusCode.NoContent
                 };
            }
            return apiResult.Send200(result);
      } 
      catch (Exception ex)
      {
            return apiResult.Send400(ex.Message);
      }
}

uj5u.com熱心網友回復：

回傳 NoContext 回應時不能回傳任何值。這是我看到的將您的訊息添加到回應標頭的唯一方法。這段代碼是用VS測驗的

....
 if(response.StatusCode == HttpStatusCode.NoContent)
 {
   var reason= response.Headers.FirstOrDefault(h=> h.Key=="Reason");
   if(reason!=null)
    await helperService.InvokeAlert("Bad Request", $@"{reason.Value}", true);
 }
 .....

行動

HttpPost]
 public async Task<ActionResult> UpdateCalendarEntry(CalendarEntry model)
 {
            .....
  if(result == null)
  {
 HttpContext.Response.Headers.Add("Reason", "Cannot Do It!");
return NoContent();
  }
}

標籤：C＃ asp.net核心 blazor-webassembly

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