Async Quiz #1

Assuming you have the following code snippet:

public class Factory
{
    public static async Task<IDisposable> Create()
    {
        await Task.Delay(500);
        return new Disposale();
    }
}
 
public class Disposale : IDisposable
{
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
    protected virtual void Dispose(bool disposed)
    {
        if(disposed)
            Console.WriteLine("Disposed :)");
        else
            Console.WriteLine("Disposed from Finalizer :(");
    }
    ~Disposale()
    {
        Dispose(false);
    }
}

What will be the output of the following code snippet?

static async Task ExecuteAsync(string[] args)
{
    using (Factory.Create())
    {
        await Task.Delay(2000);
    }
    GC.Collect();
    Console.ReadKey();
}

The answer is: Disposed from Finalizer :(

You shouldn’t forget to awit.

The following code will do the difference:

static async Task ExecuteAsync(string[] args)
{
    using (await Factory.Create())
    {
        await Task.Delay(2000);
    }
    GC.Collect();
    Console.ReadKey();
}

The previous code snippet is actually disposing the Task.