Webapi POST工作，但不是DELETE

Question

我的Web应用程序向我的web api项目发送POST或DELETE HTTP请求。 POST工作正常，但DELETE抛出以下http 500错误：

"Message":"An error has occurred.",
"ExceptionMessage":"No MediaTypeFormatter is available to read an object of type 'EasNotification' from content with media type'text/plain'.",
"ExceptionType":"System.InvalidOperationException",
"StackTrace":" at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger)\r\n   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger)\r\n   at System.Web.Http.ModelBinding.FormatterParameterBinding.ExecuteBindingAsync(ModelMetadataProvider metadataProvider, HttpActionContext actionContext, CancellationToken cancellationToken)\r\n   at System.Web.Http.Controllers.HttpActionBinding.<>c__DisplayClass1.<ExecuteBindingAsync>b__0(HttpParameterBinding parameterBinder)\r\n   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()\r\n   at System.Threading.Tasks.TaskHelpers.IterateImpl(IEnumerator`1 enumerator, CancellationToken cancellationToken)"

POST和DELETE在标题中都有以下内容：

  

接受：application / json，text / plain，

发布和删除的Hook对象都是相同的JSON对象。

我想了解为什么DELETE抛出异常？

这是我的控制器方法：

 public void DeleteHook(Hook hook)
 {
      try
      {
           var hookRepo = new HookRepository();  <--- Breakpoint never reached
           hookRepo.DeleteNotificationHook(hook);
      }
      catch (Exception ex)
      {
           var httpStatus = statusBuilder.GetStatusCode(ex.GetType());
           var httpError = new HttpError(ex, true);
           var errorResponse = Request.CreateErrorResponse(httpStatus, httpError);
           throw new HttpResponseException(errorResponse);
      }
 }

 public void PostHook(Hook hook)
 {
      try
      {
           var hookRepo = new HookRepository();
           hookRepo.UpsertHook(hook);
      }
      catch (Exception ex)
      {
           var httpStatus = statusBuilder.GetStatusCode(ex.GetType());
           var httpError = new HttpError(ex, true);
           var errorResponse = Request.CreateErrorResponse(httpStatus, httpError);
           throw new HttpResponseException(errorResponse);
      }
 }