using System;

using System.Linq;

using System.Collections.Generic;

public class MyComplexType { public string Text { get; set; } }

​

public class Program

{

    public static void Main()

    {

        var d = new Dictionary<string,object>

        {

            { "string"  , "Foo"        },

            { "int"     , 123            },

            { "MuComplexType", new MyComplexType { Text = "Bar" } }

        };

        var s = d.Values.OfType<string>().Single();

        var i = d.Values.OfType<int>().Single();

        var o = d.Values.OfType<MyComplexType>().Single();

        Console.WriteLine(s);

        Console.WriteLine(i);

        Console.WriteLine(o.Text);

    }

}