Kiev ALT.NET

using System;
using System.Reflection;
using System.Runtime.ExceptionServices;
using FunctionalWeapon.Monads;
using NUnit.Framework;

namespace NoThrow.Tests
{
    public struct NoThrow<T>
    {
        private T value;

        private NoThrow(T value, Exception exception) : this()
        {
            this.value = value;
            Exception = exception;
        }

        public NoThrow(Exception exception) : this(default(T), exception)
        { }

        public NoThrow(T value) : this(value, null) { }

        public T Value
        {
            get
            {
                if (Exception != null)
                {
                    // Exception.PreserveStackTrace(); // will preserve stack trace
                    // Exception.Retrhow(); //The same stuff but will work only for .NET 4.5
                    throw Exception;
                }

                return value;
            }
        }

        public Exception Exception { get; private set; }
    }

    public static class NoThrow
    {
        public static NoThrow<T> Apply<T>(Func<T> func)
        {
            try
            {
                return new NoThrow<T>(func());
            }
            catch (Exception ex)
            {
                return new NoThrow<T>(ex);
            }
        }

        public static NoThrow<R> Bind<A, R>(this NoThrow<A> noThrow, Func<A, R> function)
        {
            if (noThrow.Exception != null)
                return new NoThrow<R>(noThrow.Exception);

            try
            {
                return new NoThrow<R>(function(noThrow.Value));
            }
            catch (Exception ex)
            {
                return new NoThrow<R>(ex);
            }
        }
    }

    public static class ExceptionEx
    {
        public static void PreserveStackTrace(this Exception exception)
        {
            var preserveStackTrace =
                typeof(Exception).GetMethod("InternalPreserveStackTrace", BindingFlags.Instance | BindingFlags.NonPublic);
            preserveStackTrace.Invoke(exception, null);
        }

        public static void Retrhow(this Exception exception)
        {
            ExceptionDispatchInfo.Capture(exception).Throw();
        }
    }

    class Singleton<T> where T : new()
    {
        private static T _instance = new T();
        public static T Instance { get { return _instance; } }
    }

    class CrazyService
    {
        public CrazyService()
        {
            throw new CustomException("Ooops!!!");
        }

        public string GetSomeDataFromService()
        {
            return "42";
        }
    }

    class CustomException : Exception
    {
        public CustomException(string message) : base(message)
        { }
    }

    [TestFixture]
    public class NoThrowTests
    {
        private static NoThrow<CrazyService> Foo()
        {
            return NoThrow.Apply(() => Singleton<CrazyService>.Instance);
        }

        [Test]
        public void Test_Simple_Corner_Case()
        {
            var context = Foo().Bind(cs => cs.GetSomeDataFromService());

            try
            {
                Console.WriteLine(context.Value);
            }
            catch (Exception e)
            {
                Console.WriteLine("Message: " + e.Message);
                Console.WriteLine("Message: " + e.InnerException.Message);
                Console.WriteLine("Message: " + e.InnerException.InnerException.Message);
                Console.WriteLine("StackTrace: " + e.StackTrace);
            }
        }

    }
}