Question

我正在使用本文第一个答案中的方法：How to create byte array from HttpPostedFile但由于某种原因它不适用于.docx文件。

//viewmodel.File is HttpPostedFileBase

byte[] fileData;
using (var binaryReader = new BinaryReader(viewModel.File.InputStream))
{
    fileData = binaryReader.ReadBytes(viewModel.File.ContentLength);
}

on .docx文件fileData显示为{byte[0]}，但它适用于pdfs，excel文件（xlsx），2007年前word文件（doc）和图像（即值大于零））。保存到数据库，fileData为0x。

如何从HttpInputStream获取docx文件的字节数组？

更新
我的web.config配置了

<httpRuntime targetFramework="4.5" maxRequestLength="102400" />

这适用于大于4MB的xslx文件，但不包含小于80KB的docx文件。

更新2
我可以使用此处说明的方法填充fileData：http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.fileupload.postedfile.aspx

byte[] fileData = new byte[viewModel.File.ContentLength];
viewModel.File.InputStream.Read(fileData, 0, viewModel.File.ContentLength);

但是，如果我将该字节数组保存到数据库并尝试写入文件，则会严重损坏。在这种情况下保存到数据库看起来像0x00000000000000000000000...

更新3
这是整个控制器方法，但我不认为看到整个事情是必要的：

    [HttpPost]
    public ActionResult SaveChangeFile(AttachmentFormViewModel viewModel)
    {
        if (viewModel.File == null)
            return Json(new { success = false, message = "No file was found, please select a file and try again." }, "text/x-json",
                        JsonRequestBehavior.DenyGet);
        try
        {

            //Validate that the right kind of File has been uploaded
            OperationResponse response = _attachmentProcessor.ValidateAttachmentContentType(viewModel.File, (ChangeFileTypeEnum)viewModel.FileType);
            if (!response.IsSuccess)
                return Json(new { success = response.IsSuccess, message = response.Message }, "text/x-json", JsonRequestBehavior.DenyGet);

            UpdateProjectFromCostCalculatorRequest projectValues = null;

            Workbook workbook = null;
            Document document = null;

            if (_attachmentProcessor.IsWorkbook(viewModel.File))
                workbook = new Workbook(viewModel.File.InputStream);

            if (_attachmentProcessor.IsDocument(viewModel.File))
                document = new Document(viewModel.File.InputStream);

            var filename = Path.GetFileName(viewModel.File.FileName);

            //if cost calc, validate that the values are correct and update related project
            switch ((ChangeFileTypeEnum)viewModel.FileType)
            {
                case ChangeFileTypeEnum.CostCalculator:
                    response = _attachmentProcessor.ValidateCostCalculator(workbook, filename);
                    if (response.IsSuccess)
                        projectValues = _attachmentProcessor.GetDataFromCostCalculator(workbook);

                    break;
                case ChangeFileTypeEnum.DataValidation:
                    response = _attachmentProcessor.ValidateDataValidation(workbook);
                    break;
                case ChangeFileTypeEnum.WorkPaper:
                    response = _attachmentProcessor.ValidateWorkPaper(document);
                    break;
            }

            //return error message if any of the validations above failed
            if (!response.IsSuccess)
                return Json(new { success = response.IsSuccess, message = response.Message }, "text/x-json", JsonRequestBehavior.DenyGet);

            //get the file from the stream and put into a byte[] for saving the database
            byte[] fileData;
            using (var binaryReader = new BinaryReader(viewModel.File.InputStream))
            {
                fileData = binaryReader.ReadBytes(viewModel.File.ContentLength);
            }
            var file = new ChangeFile
                               {
                                   ChangeRequestID = viewModel.ChangeRequestId,
                                   ChangeFileTypeID = viewModel.FileType,
                                   File = fileData,
                                   Filename = filename,
                                   ContentType = viewModel.File.ContentType,
                                   CreatedBy = User.UserNameWithoutDomain(),
                                   UpdatedBy = User.UserNameWithoutDomain(),
                                   CreatedDate = DateTime.Now,
                                   UpdatedDate = DateTime.Now
                               };

                _changeRequestService.SaveChangeFile(file);

            var log = new ChangeFileImportLog { CreatedDate = DateTime.Now };
            switch ((ChangeFileTypeEnum)viewModel.FileType)
            {
                case ChangeFileTypeEnum.CostCalculator:
                    var project = _changeRequestService.GetChangeProjectByPsrs(file.ChangeRequestID, projectValues.PsrsNumber);
                    if (project != null)
                    {
                        _attachmentProcessor.UpdateChangeProjectWithProjectValues(project, projectValues);
                        log.NumberOfErrors = 0;
                        log.NumberOfSegmentChanges = 0;
                        log.NumberOfWarnings = 0;
                    }
                    else
                    {
                        log.NumberOfWarnings = 1;
                        log.Warnings =
                            String.Format(
                                "There is no project on this Change Request with PSRS \"{0}\". If there was, the new cost would be updated with \"{1:C0}\"",
                                projectValues.PsrsNumber, projectValues.Cost);
                    }
                    break;
                case ChangeFileTypeEnum.DataValidation:
                    log = _attachmentProcessor.CreateChangeSegmentsFromDataValidation(workbook, file.ChangeRequestID, file.ChangeFileID, User);
                    break;
                case ChangeFileTypeEnum.WorkPaper:
                    log = _attachmentProcessor.UpdateChangeProjectsFromWorkPaper(document, file.ChangeRequestID, file.ChangeFileID,
                                                                                 User);
                    break;
            }

            log.CreatedBy = User.UserNameWithoutDomain();
            log.CreatedDate = DateTime.Now;
            log.UpdatedBy = User.UserNameWithoutDomain();
            log.UpdatedDate = DateTime.Now;

            _changeRequestService.SaveChangeFileImportLog(log, file.ChangeFileID);
            _changeRequestService.Commit();
            return Json(new { success = response.IsSuccess, message = response.Message }, "text/x-json", JsonRequestBehavior.DenyGet);
        }
        catch (Exception ex)
        {
            return Json(new { success = false, message = String.Format("A system error was encountered: {0}", ex) }, "text/x-json", JsonRequestBehavior.DenyGet);

        }
    }

Answer 1

事实证明，因为我已经使用了流（请参阅问题中的控制器方法），所以当我尝试保存它时它是空的。

我不确定为什么我使用docx而不是xlsx来体验这一点，因为他们都在保存前消耗了Streams。我的猜测是它与Aspose.Cells和Aspose.Words实现的差异有关。

但是，无论如何，我将流上的位置设置为0，然后就可以了。

//viewmodel.File is HttpPostedFileBase

viewModel.File.InputStream.Position = 0; //<-----This fixed it!

byte[] fileData;
using (var binaryReader = new BinaryReader(viewModel.File.InputStream))
{
    fileData = binaryReader.ReadBytes(viewModel.File.ContentLength);
}

如何从HttpInputStream获取docx文件的字节数组？

1 个答案: