using System;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var test = new List<string>();

        var test1 = new Dictionary<string, IEnumerable<string>>();

        var test2 = new Dictionary<string, int>();

        var test3 = new Dictionary<long, object>();

        test1.Add("test", new List<string> { "Test11", "Test12" });

        test1.Add("test1", new List<string> { "Test21", "Test22" });

        Console.WriteLine(string.Join(";", test1.Values.Select(t => string.Join(",", t))));

        Console.WriteLine(IsDictionary(test));

        Console.WriteLine(IsDictionary(test1));

        Console.WriteLine(IsDictionary(test2));

        Console.WriteLine(IsDictionary(test3));

    }

    public static bool IsDictionary(IEnumerable data)

    {

        return data is IDictionary d;

    }

}