using System;

using System.Collections.Generic;

public class Program

{

    private static String test(object search) {

        foreach(var typeFunc in new Dictionary<Type,Func<String>> {

            { typeof(String), () => "Bar" },

            { typeof(Int32), () => "Foo" },

            { typeof(Boolean), () => null }

        }) {

            if(typeFunc.Key.IsAssignableFrom(search.GetType())) {

                var result = typeFunc.Value();

                if(result != null) return result;

            }

        }

        return null;

    }

    public static void Main()

    {

        Console.WriteLine("1: " + test("a"));   // 1: Bar

        Console.WriteLine("2: " + test(5));     // 2: Foo

        Console.WriteLine("3: " + test(true));  // 3: 

        Console.WriteLine("4: " + test(2.0));   // 4: 

    }

}