Azure Blob Storage not Uploading

Question

I'm trying to upload a text file from a stream to AzureBlobStorage in .Net Core but it seems to be failing silently. I am reading data from a database and writing it into a MemoryStream using a StreamWriter. At the point I am uploading to BlobStorage, the Stream has a Length of 7147 so I know it's got data in it.

Here's my code to upload the file:

public static async void UploadFromStream(string fileName, Stream stream, string fileExtenstion = "txt")
{
    var storageAccount = CloudStorageAccount.Parse(_connectionString);
    var blobClient = storageAccount.CreateCloudBlobClient();
    var container = blobClient.GetContainerReference("logs");
    // By this point, I have a reference to my `logs` container which exists
    var blockBlob = container.GetBlockBlobReference($"{fileName}.{fileExtenstion}");

    try
    {
        stream.Position = 0;
        await blockBlob.UploadFromStreamAsync(stream);
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
        throw;
    }
}

Called by:

var memoryStream = new MemoryStream();
using (var writer = new StreamWriter(memoryStream))
{
    while (reader.Read())
    {
        writer.WriteLine(
            $"[{reader["Timestamp"]}][{reader["Level"].ToString().ToUpper()}] :: {reader["Message"]}{(!string.IsNullOrWhiteSpace(reader["Exception"].ToString()) ? " -- " + reader["Exception"] : "")}");
    }
    Task.Run(() => StorageService.UploadFromStream($"logfile_{DateTime.Today:s}", memoryStream)).Wait();
}

I don't get inside my Catch block so I don't think I'm hitting any Exceptions, but when I check my Storage, there's nothing there. The application runs through with no errors.

I have even tried using byte[] bytes = stream.ToArray() and using the blockBlob.UploadFromByteArrayAsync but still to no avail.

Answer 1

Don't use async void (except for Event handlers). See Async/Await - Best Practices in Asynchronous Programming

Use public static async Task UploadFromStream instead.

You will probably get an exception and be able to track down the error.