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委托让冒泡排序的扩展更加优雅--开闭原则的使用

 

本文主要谈的是委托相关运用。包括委托的简单定义,使用,好处;以及委托和Lambda的关系。所有知识点都简化为启发式的注释,应该不难理解,希望对你有帮助。

  /// <summary>

    /// 委托让排序代码更加优雅(易扩展,易维护)

    /// 本文包含知识点:

    /// 1.委托定义

    /// 2.委托的好处

    /// 3.Lamda(包括语句Lamda和表达式Lambda)

    /// 4.Lambda和委托的关系

    /// </summary>

    class Program

    {

        //定义内嵌委托(委托本质是一个类;编译器默认为继承自System.Delegate)

        public delegate bool ComparerionHandler(int first, int second);

 

        static void Main(string[] args)

        {

 

            int[] beforeSortList = new int[3] { 1, 3, 2 };

 

            Console.WriteLine(string.Join(",", beforeSortList.ToArray()));

 

            ///实名委托传递参数

            //int[] afterSortList = BubbleSort(beforeSortList, Asb);

      //int[] afterSortList = BubbleSort(beforeSortList, Desc);

 

            ///匿名方法传递参数

            //int[] afterSortList = BubbleSort(beforeSortList, delegate(int first, int second) { return first > second; });

      //int[] afterSortList = BubbleSort(beforeSortList, delegate(int first, int second) { return first < second; });

 

            ///语句Lambda传递参数(Lambda是匿名方法的简化语法)

            int[] afterSortList = BubbleSort(beforeSortList, (first, second)=>{ return first > second; });

 

            Console.WriteLine(string.Join(",", afterSortList.ToArray()));

 

 

        }

    ——————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————

 

    //利用委托达到-->对扩展是开放的

        //升序

        //public static bool Asb(int first, int second)

        //{

        //    return first > second;

        //}

 

        //降序

        public static bool Desc(int first, int second)

        {

            return first < second;

        }

 

        //字母排序

 

        //可扩展的其他排序……

 

 

     ——————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————

    //冒泡排序

    //利用委托达到-->对修改是封闭的

        public static int[] BubbleSort(int[] list, ComparerionHandler compareion)

        {

            int temp;

 

            for (int i = list.Length - 1; i >= 0; i--)

            {

                for (int j = 1; j <= i; j++)

                {

                    if (compareion(list[j - 1], list[j]))

                    {

                        temp = list[j];

                        list[j] = list[j - 1];

                        list[j - 1] = temp;

                    }

                }www.zzzyk.com

            }

            return list;

        }

 

    }

摘自:水木年华

补充:软件开发 , C# ,
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