从Azure Blob存储中检索pdf

Question

I'm trying to retrieve pdf documents from my azure blob-storage. I am getting the document, but when I try to open it, it tells me that it cant read the data.

[HttpGet("GetFromBlob")]
    public async Task<ActionResult> GetFileFromBlob(string id)
    {

        MemoryStream ms = new MemoryStream();

        CloudStorageAccount storageAccount = CloudStorageAccount.Parse("connectionString");

        CloudBlobClient BlobClient = storageAccount.CreateCloudBlobClient();
        CloudBlobContainer c1 = BlobClient.GetContainerReference("blobName");

        if (await c1.ExistsAsync())
        {
            CloudBlob file = c1.GetBlobReference("FileReference");

            if (await file.ExistsAsync())
            {
                await file.DownloadToStreamAsync(ms);
                Stream blobStream = file.OpenReadAsync().Result;
                return File(blobStream, file.Properties.ContentType, file.Name);
            }
            else
            {
                return Content("File does not exist");
            }
        }
        else
        {
            return Content("Container does not exist");
        }
    }

Turns out that my file format was wrong

Answer 1

Please try use the code below, which works fine at my side:

In the code block if(await file.ExistsAsync()) :

        if (await file.ExistsAsync())
        {
            await file.DownloadToStreamAsync(ms);
            var stream = await file.OpenReadAsync();
            return File(stream, "application/pdf");
        }