using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        IEnumerable<A> source = new [] { new A() };

        IList<B> dest = new List<B>{ new B() };

        Do(source, dest, (sItem, dItem) => sItem.Id == dItem.Id);

    }

    private static TDest Do<TDest, TDestMemberItem, TSourceMemberItem>(

        IEnumerable<TSourceMemberItem> source,

        TDest dest,

        Func<TSourceMemberItem, TDestMemberItem, bool> matcher)

    {

        return dest;

    }

}

​

​

public class A

{   

    public Guid Id { get; set; }     

}

​

public class B

{   

    public Guid Id { get; set; }     

}