SimpleRefactorings.Medium.Decorator1

.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading.Tasks;

namespace FunctionalExperimentation.SimpleRefactorings.Medium.Decorator1
{
    public static partial class FuntionalExtensions
    {
        /// <summary>
        /// Adds a debug loggin on the Task Result.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="this"></param>
        /// <returns></returns>
        public static Task<T> AddDebugLogging<T>(this Task<T> @this) =>
            @this.ContinueWith(continuationFunction: (task) =>
            {
                var result = task.Result;
                Debug.WriteLine(result);
                return result;
            });
        public static Task<T> AddDebugLogging<T>(this Task<T> @this, Action<T> action) =>
            @this.ContinueWith(continuationFunction: (task) =>
            {
                var result = task.Result;
                action(result);
                return result;
            });
         
    }

    public class OperationManager<T, R>
    {
        public async Task<R> OperationAsync(T t) => default(R);
    }

    public class Example
    {

        public static async Task RunAsync()
        {
            var operationManager = new OperationManager<int, string>();

            var result = await operationManager.OperationAsync(1)
                .AddDebugLogging();

            var result1 = await operationManager.OperationAsync(1)
                .AddDebugLogging(x => Debug.WriteLine(x));
        }


    }
}