[WebApiUtils] Fixed save uploaded file

WebAPiUtils-test/Controllers/ValuesController.cs

         {
             return Handle(ValuesBusiness.AddDbo(obj));
         }
+
+        [HttpPost]
+        [Route("api/values/upload")]
+        public string Upload()
+        {
+            return Handle(SaveFileToTemp().Result);
+        }
     }
 }

WebApiUtils/BusinessManager/BMRHandler.cs

         /// Save the uploaded file to the temp dir
         /// </summary>
         /// <returns>The file path</returns>
+        [NonAction]
         public async Task<OpResult<string>> SaveFileToTemp()
         {
-            if (!Request.Content.IsMimeMultipartContent())
-            {
-                return OpResult<string>.Error(ResultStatus.InputError, "Bad content type", "");
-            }
             IEnumerable<HttpContent> parts = null;
             try
             {
             }
             catch (Exception e)
             {
-                return OpResult<string>.Error(ResultStatus.InputError, e, "Failed to read uploaded file");
+                return OpResult<string>.Error(ResultStatus.InputError, e, "Failed to read post parts (maximum size exceeded?)");
             }
             HttpContent file = parts.FirstOrDefault();
             if (file == null)