Fail Fast

using System;

namespace FailFast
{
    public static class Assert
    {
        public static Action<String> LogCallback { set; get; }

        static Assert()
        {
            LogCallback = (msg) => Console.WriteLine(msg);
        }

        public static void NotNull(Object o, String message)
        {
            if (o == null)
            {
                if (!String.IsNullOrEmpty(message))
                    LogCallback(message);
                throw new AssertNullReferenceException();
            }
        }
        public static void NotNull(Object o)
        {
            NotNull(o, "");
        }
    }

    [Serializable()]
    public class AssertNullReferenceException : System.Exception
    {
        public AssertNullReferenceException() : base() { }
        public AssertNullReferenceException(string message) : base(message) { }
        public AssertNullReferenceException(string message, System.Exception inner) : base(message, inner) { }

        // A constructor is needed for serialization when an
        // exception propagates from a remoting server to the client.
        protected AssertNullReferenceException(System.Runtime.Serialization.SerializationInfo info,
            System.Runtime.Serialization.StreamingContext context) { }
    }
}