Use of lambda delegate as factory.

TestFactorySubstitute.cs

using System;

namespace TestFactorySubstitute
{

    public class MyClass
    {
        public int Execute (Func<string, MyDependency> mydependency, int value)
        {
            return mydependency(DateTime.Now.ToShortTimeString()).Call(value);
        }
    }

    public class MyDependency
    {
        public MyDependency(string currentTime)
        {
            Console.WriteLine("Hey: " + currentTime);
        }

        public int Call(int value)
        {
            return value;
        }
    }

    public static class Program
    {
        public static void Main()
        {
            var myClass = new MyClass();
            Console.WriteLine(myClass.Execute(x =>new MyDependency(x), 5));
            Console.ReadLine();
        }
    }
}

Simple case in which a new object of a type is injected into another class.