[FEATURE REQ] Storage: Better Stream support

[yahorsi]

Hi Guys,

Using latest SDK: 12.4.4

We're migrating to the Azure and was a bit surprised the SDK does not have "full" Stream support.
Imagine we have following code that writes stream:

            using (var fileStream = fileProvider.CreateOutputStream(fullFilePath))
            using (var outputStream = new ZipOutputStream(fileStream))
            using (var writer = new StreamWriter(outputStream))
            {
                outputStream.PutNextEntry(new ZipEntry($"{reportTitle}.{FileExtensionConstant.CSV}"));
                new CommissionHistoryCsvExporter().ExportToCsv(selectQuery, queryParams, writer);
            }

In the code above, CreateOutputStream, creates file based stream.
With current API we cannot migrate to the Azure blob storage without significant code changes, currently to upload the blow there is only one method Upload that accepts stream that must "pre exists". In other words, you have to have a stream already, and in order to get one you must create it on the memory or file. Creating it on memory is not acceptable for us as files might be big, creating on the file system in not acceptable because of the load and space limitations.

Suggestions:
Add API to expose upload/download stream explicitly.
Like:

1. Stream .GetUploadStream()
2. Stream .GetDownloadStream()

This will fully enable Stream.CopyTo() functionality and will make integration with existing code way simpler.

Seems similar issues:
#9607

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @xgithubtriage.

[amnguye]

@seanmcc-msft is this a duplicate?

[yahorsi]

Just FYI, in the V11 there is OpenWrite method that does exactly what we need.

[seanmcc-msft]

Duplicate of #9607.

We are actively working on this issue: #12400, #13344.