Extensions that turns Unity's AsyncOperations into true C# async/await. Full credit to james7132 on the unity forum

IAsyncOperationExtensions.cs

/*
From https://forum.unity.com/threads/will-unity-ever-make-a-move-to-async-await-task.557908/#post-3699391
Full credit to james7132
*/

public static class IAsyncOperationExtensions {
 
  public static AsyncOperationAwaiter GetAwaiter(this IAsyncOperation operation) {
    return new AsyncOperationAwaiter(operation);
  }
 
  public static AsyncOperationAwaiter<T> GetAwaiter<T>(this IAsyncOperation<T> operation) where T : Object {
    return new AsyncOperationAwaiter<T>(operation);
  }
 
  public readonly struct AsyncOperationAwaiter : INotifyCompletion {
 
    readonly IAsyncOperation _operation;
 
    public AsyncOperationAwaiter(IAsyncOperation operation) {
      _operation = operation;
    }
 
    public bool IsCompleted => _operation.Status != AsyncOperationStatus.None;
 
    public void OnCompleted(Action continuation) => _operation.Completed += (op) => continuation?.Invoke();
 
    public object GetResult() => _operation.Result;
 
  }
 
  public readonly struct AsyncOperationAwaiter<T> : INotifyCompletion where T : Object {
 
    readonly IAsyncOperation<T> _operation;
 
    public AsyncOperationAwaiter(IAsyncOperation<T> operation) {
      _operation = operation;
    }
 
    public bool IsCompleted => _operation.Status != AsyncOperationStatus.None;
 
    public void OnCompleted(Action continuation) => _operation.Completed += (op) => continuation?.Invoke();
 
    public T GetResult() => _operation.Result;
 
  }
 
}
 
// This makes the following code compile without issue:
/*
async void TestAsyncAddressables() {
  Sprite sprite = await assetReference.LoadAsset<Sprite>();
}
 */