c#委托的用处： 我仅仅知道委托是将方法作为参数，求进一步指导

c#委托的用处： 我仅仅知道委托是将方法作为参数，求进一步指导

public delegate bool ComparisonHandler(int first, int second);//委托类型的声明

    class BubbleSort1
    {
        public static bool GreaterThan(int first, int second)//升序排序
        {
            return first > second;
        }

        public static bool LessThan(int first, int second)//降序排序
        {
            return first < second;
        }

        public static void BubbleSort(int[] items, ComparisonHandler comparisonMethod)
        {
            int i, j, temp;

            if (items == null)
            {
                return;
            }
            if (comparisonMethod == null)
            {
                throw new ArgumentNullException("comparisonMehtod is NULL !");
            }
            for (i = items.Length - 1; i >= 0; i--)
            {
                for (j = 1; j <= i; j++)
                {
                    if (comparisonMethod(items[j - 1], items[j]))
                    {
                        temp = items[j - 1];
                        items[j - 1] = items[j];
                        items[j] = temp;
                    }
                }
            }
        }

    }

    class Program
    {
        static void Main(string[] args)
        {
            int intcount;
            Console.WriteLine("Please input the count of an Integer to sort which the sequence number:");
            intcount = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("
Please input an Integer to sort sequence:");
            int[] items = new int[intcount];
            for (int i = 0; i < intcount; i++)
            {
                items[i] = Convert.ToInt32(Console.ReadLine());
            }

            ComparisonHandler comparisonMethod = BubbleSort1.GreaterThan;
            BubbleSort1.BubbleSort(items, comparisonMethod);

            Console.WriteLine("
The sorting method in the calling class BubbleSort1 sorted sequence of integers as follows:");
            Console.WriteLine("
Ascending Order:");
            for (int i = 0; i < intcount; i++)
            {
                Console.Write(items[i] + " ");
            }
            Console.ReadKey();

            ComparisonHandler comparisonMethodLess = BubbleSort1.LessThan;
            BubbleSort1.BubbleSort(items, comparisonMethodLess);

            Console.WriteLine("
");

            Console.WriteLine("Descending Order:");
            for (int i = 0; i < intcount; i++)
            {
                Console.Write(items[i] + " ");
            }
            Console.ReadKey();
        }
    }
    
 //一个委托实例；追问这么长追答这只是一个小Demo，里面没有多少内容的，就是一个数组的排序；
只说概念有点抽象，这个Demo便于理解概念。

动态调用方法时方便。