using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main(string[] args)

    {

        var validator = new Validator().Add((int item) => item == 5).Add((string s) => !String.IsNullOrWhiteSpace(s));

        Console.Out.WriteLine(validator.Validate(5));

    }

}

​

public interface IValidatorRule

{

}

​

public interface IValidatorRule<T> : IValidatorRule

{

    bool Validate(T item);

}

​

public class IntValidatorRule : IValidatorRule<int>

{

    public bool Validate(int item)

    {

        return item > 0;

    }

}

​

public class StringValidatorRule : IValidatorRule<String>

{

    public bool Validate(String item)

    {

        return !String.IsNullOrEmpty(item);

    }

}

​

public delegate bool ValidateDelegate<T>(T item);

public class GenRule<T> : IValidatorRule<T>

{

    public ValidateDelegate<T> impl;

    public GenRule(ValidateDelegate<T> cb)

    {

        impl = cb;

    }

​

    public bool Validate(T item)

    {

        return impl.Invoke(item);

    }

}

​

public class Validator

{

    private List<IValidatorRule> rules = new List<IValidatorRule>();

    public Validator Add<T>(ValidateDelegate<T> cb)

    {

        rules.Add(new GenRule<T>(cb));

        return this;

    }

​

    public bool Validate<T>(T item)

    {

        foreach (IValidatorRule<T> rule in rules)

        {

            if (!rule.Validate(item))

            {

                return false;

            }

        }

​

        return true;

    }

}