File async APIs

[TahirAhmadov]

I'm sure this question was asked before, but I couldn't find anything. Is there a plan to make all file APIs available in async mode? I'm talking about:

• Opening a file (creation of FileStream)
• FileInfo Refresh(), Delete()
• DirectoryInfo Create()
• etc.

I read somewhere that the problem is unavailability of such APIs in Windows and potentially other OSes. Is there an update from the Windows team on making this available? Can we get "fake" ones for now, to replace with "real" calls later?

[GeraudFabien]

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/async/using-async-for-file-access

[TahirAhmadov]

That page talks about some APIs which are async now, but my question was about all the other ones.

[huoyaoyuan]

I read somewhere that the problem is unavailability of such APIs in Windows and potentially other OSes.

This should be the exact reason.

There was proposal for asynchronous filesystem, instead of file. However, there lacks platform support. As far I can search, the "mobile" OSes (Android, iOS, WinRT) provide some sort of async filesystem (at least OpenAsync). However, I can't find any support on desktop OSes (Win32/Linux/Mac).

[huoyaoyuan]

Is there an update from the Windows team on making this available?

I want to ask this too. @dotnet/area-system-io for information

[adamsitnik]

Unfortunately the OSes that we support don't provide a way to asynchronously open a file, not to mention other operations.