MWS fba api错误请求c＃

Question

您好我正在测试MarketplaceWebService.Samples.But它总是响应错误的请求。 invaild请求。 任何人都可以帮忙看看。 感谢。

SubmitFeedRequest request = new SubmitFeedRequest();
            request.Merchant = merchantId;
            request.MWSAuthToken = "<Your MWS Auth Token>"; // Optional
            request.MarketplaceIdList = new IdList();
            request.MarketplaceIdList.Id = new List<string>(new string[] { marketplaceId });



            request.FeedContent = File.Open("feed.xml", FileMode.Open, FileAccess.Read);


            request.ContentMD5 = MarketplaceWebServiceClient.CalculateContentMD5(request.FeedContent);
            request.FeedContent.Position = 0;

            request.FeedType = "_POST_PRODUCT_DATA_";

            SubmitFeedSample.InvokeSubmitFeed(service, request);

feed.xml                    1.01     machantid          产品     假          1     更新          testsku          UPC     123456789