通过 .Net Web api 从 azure blob 下载文档

Question

我很难弄清楚出了什么问题。我的应用程序访问 api 来获取文档。发生的情况是下载开始，但挂起。最终它会完成（要么有错误，要么完全完成），但是当我尝试打开 pdf 时，我收到“无法打开 pdf”或类似的信息。它在本地工作。

我的控制器：

 [Route("api/listing/attachment")]
    [HttpGet]
    public async Task<IHttpActionResult> GetAttachmentAsync(string fileName)
    {
        var attachment = await _repository.GetAttachmentAsync(fileName);
        var response = HttpContext.Current.Response;
        response.Clear();
        response.ContentType = "application/x-download";
        var removePath = fileName.Substring(fileName.IndexOf("/", fileName.IndexOf("/", StringComparison.Ordinal) + 1, StringComparison.Ordinal) + 1);
        response.AddHeader("content-disposition", string.Format("attachment; filename={0}", removePath));
        response.AddHeader("content-length", attachment.Length.ToString());
        response.BinaryWrite(attachment);
        response.Flush();
        return null;
    }

我的存储库：

public async Task<byte[]> GetAttachmentAsync(string fileName)
    {
        var container = _blobClient.GetContainerReference(_containerName);
        var blockBlob = container.GetBlockBlobReference(fileName);
        using (var memoryStream = new MemoryStream())
        {
            await blockBlob.DownloadToStreamAsync(memoryStream);
            return memoryStream.ToArray();
        }
    }

Answer 1

尝试将控制器代码更改为：

[Route("api/listing/attachment")]
[HttpGet]
public async Task<HttpResponseMessage> GetAttachmentAsync(string fileName)
{
    var attachment = await _repository.GetAttachmentAsync(fileName);
    var removePath = fileName.Substring(fileName.IndexOf("/", fileName.IndexOf("/", StringComparison.Ordinal) + 1, StringComparison.Ordinal) + 1);

    var result = new HttpResponseMessage(HttpStatusCode.OK)
    {
        Content = new ByteArrayContent(attachment)
    };
    result.Content.Headers.ContentDisposition =
        new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment")
    {
        FileName = removePath
    };
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

    return result;
}