Angular前端未从.NET Web API收到ByteArray

Question

.NET Web API中有一个POST端点，用于返回内容中带有byteArray的HttpResponseMessage。

当我使用HttpClient从Angular前端调用终结点并接收响应时，发现该blob的长度与来自终结点的byteArray的大小不匹配。

我试图弄清楚为什么我没有从Content中获取byteArray。我会认为，如果我将响应解析为Blob，则应与我的byteArray的长度匹配。

控制器

[System.Web.Mvc.HttpPost]
		public HttpResponseMessage PdfSharpConvert([FromBody] PdfConvertOfficeParams parameters) {
			CheckSession();

			var data = pDAL.GetPrismClientLocatorOfficeException().Where(v => parameters.PclIds.Contains(Convert.ToInt32(v.ID)));

			var sortedData = PrismClientLocatorExceptionService.SortClientLocatorExceptionViews(PrismClientLocatorExceptionService.PrismClientLocatorOfficeExceptionToDictionary(data), parameters.Sort, parameters.FieldName);
			var sorteDataDic = PrismClientLocatorExceptionService.DicToClientLocatorOfficeException(sortedData);
			var reportText = ReportGenerator.GenerateHtmlReport(sorteDataDic);

			try {
				var filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, ReportGenerator.ReportPath);
				if (System.IO.File.Exists(filePath)) System.IO.File.Delete(filePath);

				PdfDocument pdfDoc = PdfGenerator.GeneratePdf(reportText, PageSize.Letter);\

				byte[] fileContents = null;
				using (MemoryStream stream = new MemoryStream()) {
					pdfDoc.Save(stream, true);
					fileContents = stream.ToArray();
				}
				HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
				result.Content = new ByteArrayContent(fileContents); //OR: new StreamContent(memStream);
				return result;
				
			} catch (Exception e) {
				throw e;
			}
		}

角度服务

	PdfSharpConvert(pclIds: number[], sort: string, fieldName: string) {
		let parameters = { pclIds, sort, fieldName }

		let options = new RequestOptions({ responseType: ResponseContentType.Blob });
		return this._http.post(this.myAppUrl + 'PrismClient/PdfSharpConvert', parameters, options).pipe(map((response: Response) => response.blob()));
	}

角度组件

	generateReport(data: number[], sort: string, fieldName: string): void {
		this.loading.emit(true);
		this._clientService.PdfSharpConvert(data, sort, fieldName).subscribe(
			(data) => {
				var blob = new Blob([data], { type: "application/pdf" });
				FileSaver.saveAs(data, "blobToPdf.html");
			},
			(error) => {
				console.log(error);
				this.loading.emit(false);
				this.toast({
					type: 'error',
					title: 'Report has failed to generate'
				});
			});
	}