Example: foreach, Predicate, Anonymous, Lambda

Following example demonstrates various ways to evaluate function using traditional foreach, predicate delegate, anonymous method and lambda expression.

Anonymous methods are introduced in C# 2.0 where as Lambda expressions in C# 3.0.

class Program
{
    static void Main(string[] args)
    {
        List<string> products = new List<string>();
        products.Add("HDTV");
        products.Add("UniRemote");
        products.Add("BDPlayer");
        products.Add("AvReceiver");

        string strResult;

        // old for each
        foreach (string pro in products)
        {
            if (pro.Equals("AvReceiver"))
                 Console.WriteLine(pro);
        }

        // using Predicate delegate
        strResult = products.Find(IsAV);
        Console.WriteLine(strResult);

        // using Anonymous method
        strResult = products.Find(delegate(string name)
                        {
                            return name.Equals("AvReceiver");
                        });
        Console.WriteLine(strResult);

        // using lambda expression
        strResult = products.Find(name => name.Equals("AvReceiver"));
        Console.WriteLine(strResult);
        
    }
    public static bool IsAV(string pro)
    {
        return pro.Equals("AvReceiver");
    }

}