How to make Dispose await for all async methods?

Question

I have disposable class with async methods.

class Gateway : IDisposable {
  public Gateway() {}
  public void Dispose() {}

  public async Task<Data> Request1 () {...}
  public async Task<Data> Request2 () {...}
  public async Task<Data> Request3 () {...}
}

I need Dispose to await until all running requests are completed.

So, either I need to track of all running tasks, or use AsyncLock from AsyncEx, or something else?

Updated

As I can see someone is afraid of blocking Dispose. Then we could make Task WaitForCompletionAsync() or Task CancelAllAsync() methods.

Answer 1

For the time being, you'll have to add a CloseAsync method that your users have to invoke.

Once C# 8.0 is released, you can rely on the IAsyncDisposable Interface and its language support:

await using (var asyncDisposable = GetAsyncDisposable())
{
    // ...
} // await asyncDisposable.DisposeAsync()