上传excel 文件contenttype 类型添加

CallCenterApi/CallCenterApi.Interface/CallCenterApi.Interface/Controllers/callout/CallPlanController.cs

             if (Request.Files.Count <= 0)
                 return Error("请正确上传Excel文件");
             var file = Request.Files[0];
-            if (!file.ContentType.Equals("application/vnd.ms-excel") && !file.ContentType.Equals("application/x-xls") && !file.ContentType.Equals("application/x-xlsx") && !file.ContentType.Equals("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"))
+            if (!file.ContentType.Equals("application/vnd.ms-excel") && !file.ContentType.Equals("application/x-xls") && !file.ContentType.Equals("application/x-xlsx") && !file.ContentType.Equals("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet") && !file.ContentType.Equals("application/octet-stream"))
                 return Error($"请正确上传Excel文件：file.ContentType={file.ContentType}");
             var filePath = "";
             NPOIHelper npoi = new NPOIHelper();