Implement IAsyncDisposable and remove ChainedAsyncResult as it's buggy #4865
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…enHelperAsync to prevent async deadlock on low/single thread sync context
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HongGit
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So that channels created through a `ChannelFactory<T>` without inheriting from `ClientBase<T>` can also benefit from the asynchronous disposal improvements introduced in dotnet#4865. Fixes dotnet#5270
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So that channels created through a `ChannelFactory<T>` without inheriting from `ClientBase<T>` can also benefit from the asynchronous disposal improvements introduced in dotnet#4865. Fixes dotnet#5270
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Fixes #26
Implements the method described here when using DisposeAsync. It will only handle TimeoutException or CommunicationException (or a derived class), but anything outside of those exceptions are being thrown by user code.
The problem with ChainedAsyncResult was that if you threw an exception in an event handler when closing, it would be get wrapped in a CallbackException, but then rethrown in a way where nothing would catch it and the async Close operation would never complete. I verified the replacement code will cause the exception to reach user code.
I also discovered some dead code so removed that.
This also adds CloseAsync to ClientBase<TChannel>.