using System; // Func is in System namespace

​

public class FuncConcreteExample

{

    public static void Main()

    {

        FuncConcreteExample example = new FuncConcreteExample();

        example.useFunc(example.stringlength);

        example.useOwnDelegate(example.stringlength);

    }

​

    public int stringlength(string s)

    {

        return s.Length;

    }

​

#region "Func delegate"

    public void useFunc(Func<string, int> intFromString)

    {

        Console.WriteLine("Using an Func delegate:");

        Console.WriteLine(intFromString("Hello")); // outputs 5 - the length of Hello    

    }

​

#endregion "Func delegate"

#region "Own delegate"

    // Roll your own

    public delegate int myOwnDelegate(string s);

    public void useOwnDelegate(myOwnDelegate intFromString)

    {

        Console.WriteLine("Using a myOwnDelegate delegate:");

        Console.WriteLine(intFromString("Hello")); // outputs 5 - the length of Hello    

    }

#endregion "Own delegate"

​

}