泛型委托

public static void TraditionalDelegateSyntax()
        {
            List<int> list = new List<int>();
            list.AddRange(new int[] { 1, 5, 10, 20, 33 });
            Predicate<int> callback = new Predicate<int>(IsEvenNumber);//使用传统委托语法调用FindAll 
            List<int> evenNumbers = list.FindAll(callback);
            foreach (int num in evenNumbers)
                Console.Write("{0}\t", num);
            //Output:   10    20      
        }

        // Predicate<>委托的目标     
        static bool IsEvenNumber(int i)
        { return (i % 2) == 0; }