使用具有FileStreamResult一个MemoryStream可能吗？ [英] Using a MemoryStream with FileStreamResult possible?

问题描述

我使用DotNetZip创建一个zip文件，并将其传递给FileResult。在调试，我可以确认的MemoryStream包含一个文件，但是当我通过FileStreamResult运行它，它会返回0bytes：

I'm using DotNetZip to create a zip file and pass it to a FileResult. On debug, I can verify that the MemoryStream contains a file, but when I run it through FileStreamResult, it returns 0bytes:

public FileResult GetZipFiles(int documentId) {
       var file = fileRepository.Get(documentId);
       var zip = new ZipFile();
       var stream = new MemoryStream();

       var filePath = Path.Combine(UploadsFolder, Path.GetFileName(file.Id));

       zip.AddFile(filePath);
       zip.Save(stream);

       var result = new FileStreamResult(stream, "application/zip") 
                    { FileDownloadName = "hey.zip" };

       return result;
 }

同样，我可以验证该流不为空，但是这将永远文件 hey.zip 返回为0bytes。我必须使用的MemoryStream 错在这里？或 FileStreamResult 没有什么我没想到它呢？我使用 FileStreamResult 之前，而与的MemoryStream 。

Again, I can verify that stream is not empty, but this will always return the file hey.zip as 0bytes. I must be using MemoryStream wrong here? Or FileStreamResult does something I'm not expecting it to do? I've used FileStreamResult before, but not with MemoryStream.

推荐答案

您是否尝试过设置 stream.Position = 0; 你这样做后， zip.Save（流）？

Have you tried setting stream.Position = 0; after you do the zip.Save(stream)?

此外，您可能确认的数据实际上是被写入流。检查 stream.Length 在 zip.Save 。如果 stream.Length 为零，则什么也没有被写入。

Also, you might confirm that data is actually being written to the stream. Check stream.Length after zip.Save. If stream.Length is zero, then nothing's being written.

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