private async Task MainAsync()
{
var calculator = new AverageCalculator();
var observer = new SampleObserver(calculator);
Subscribe(observer);
Subscribe(observer);
var averageValue = await calculator.GetAverageAsync().ConfigureAwait(false);
Console.WriteLine("Average: {0}", averageValue);
}
public SampleObserver(AverageCalculator averageCalculator)
{
_averageCalculator = averageCalculator;
}