c# - BeginInvoke not supported on .NET core? (PlatformNotSupported exception)

Question

I've ported a library FluentFTP to .NET standard/.NET core but the async methods use BeginInvoke within an async/await block. So its something like this:

async ConnectAsync(){
   BeginConnect();
}
void BeginConnect(){
   BeginInvoke(...)   << error at this point
}

At that point I get a PlatformNotSupported exception. What can be done to support this on .NET core?

• Full info here.
• Full code here: ConnectAsync, BeginConnect.

Answer 1

Asynchronous I/O methods should not use Delegate.BeginInvoke. That's exposing a fake-asynchronous wrapper for a synchronous method that should be asynchronous in the first place. The whole design needs re-evaluation.

.NET Core does not support Delegate.BeginInvoke for very good reasons. It's possible that .NET Core 2.0 may decide to support them (because Microsoft IMO is making some poor design decisions with v2).

But back to the original problem: the solution is to do the //TODO: implement ConnectAsync as a true asynchronous method. Then it's pretty straightforward to implement BeginConnect and EndConnect as wrappers around ConnectAsync.