Added overload to switch method for use with async code.

[bwarthur]

Fixes #84.

I went with doing an overload of Switch instead of a separate SwitchAsync because I think it will provide a better default experience. As soon as someone adds async to each of the actions, it will switch over to the Func<> overload instead of relying on someone to know to go look for an explicitly named Async version.

[adnang]

Will this result in IDE's highlighting that the Switch method is now async, and requires an await?

The problem i tried to highlight in the original issue wasn't with dicovery of the async method, but rather its usage - IMO, developers will still forget to call await on the method if its not explicit when there's a non-async overload.

Having an async overload without the Async suffix is quite unusual for stable .NET libraries, I think it will cause more confusion when the return type has changed to a Task without the method name changing.

This SO post has a similar belief https://stackoverflow.com/a/47810905

@mcintyre321 what do you think?

[AraHaan]

Rename this to SwitchAsync.

[ChristopherHaws]

This should probably be (!NETFRAMEWORK || NET40_OR_GREATER) instead of !NET35

[fbouvard]

Hi, would love to see this PR merged

[vflame]

How does this compare to doing:

await oneOf.Match<Task>( t1 => Task.CompletedTask, t2 => Task.CompletedTask);

[baynezy]

I badly need this. Any chance this happens?

[md-redwan-hossain]

Is this ever gonna merged?

[mcintyre321]

Sorry, I'm not keen on adding this, and increasing the code/assembly size. It seems to me that using the Match overload with the async keyword already handles this capability. Perhaps you could release it as a standalone nuget package.

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