如何从` `async Task`函数返回值？

async Task<int> GetValueAsync()
{
    await Task.Delay(1000);
    return 42;
}

async Task Main()
{
    int result = await GetValueAsync();
    Console.WriteLine(result);
}

Task<int> GetValueAsync()
{
    var tcs = new TaskCompletionSource<int>();
    Task.Delay(1000).ContinueWith(_ => tcs.SetResult(42));
    return tcs.Task;
}

async Task Main()
{
    int result = await GetValueAsync();
    Console.WriteLine(result);
}