APM.cs

using System;
using System.Threading.Tasks;

namespace AsyncAndAwaitSecrets.Samples
{
    public interface IAsynchronousProgrammingModel<T>
    {
        IAsyncResult BeginSomething(AsyncCallback callback, object state);
 
        T EndSomething(IAsyncResult result);
    }
 
    public class AsynchronousProgrammingModelWrapper<T>
    {
        private readonly IAsynchronousProgrammingModel<T> _apm;
 
        public AsynchronousProgrammingModelWrapper(IAsynchronousProgrammingModel<T> apm)
        {
            _apm = apm;
        }
 
        public Task<T> SomethingAsync()
        {
            return Task.Factory.FromAsync<T>(_apm.BeginSomething, _apm.EndSomething, null);
        }
    }
}