C#练习 抓阄

using System;
namespace ZhuaJiuNS {
    public class ZhuaJiu {
        public static void Main() {
            string[] namelist = null;
            CreateNameList(ref namelist);
            string[] afternamelist;
            Zhua(namelist, out afternamelist);
            PrintNameList(afternamelist);
            Console.ReadKey();
        }
        public static void CreateNameList(ref string[] beforelist) {
            beforelist = new string[5];
            beforelist[0] = "张三";
            beforelist[1] = "李四";
            beforelist[2] = "王五";
            beforelist[3] = "赵六";
            beforelist[4] = "孙七";
        }
        public static void Zhua(string[] beforelist, out string[] afterlist) {
            afterlist = new string[1];
            int tmpindex = -1;
            System.Random ran = new Random();
            if (beforelist.Length > 0) {
                Console.WriteLine("开始抓阄了：");
                int tmplength = beforelist.Length;
                for (int i = 0; i < tmplength; i++) {
                    Console.WriteLine("请回车进行抓阄");
                    Console.ReadLine();
                    tmpindex = ran.Next(0, beforelist.Length);
                    Console.WriteLine("本次抓到的人为" + beforelist[tmpindex]);
                    InsertAfterList(beforelist[tmpindex], ref afterlist);
                    RemoveFromBeforeList(tmpindex, ref beforelist);
                }
                Console.WriteLine("抓阄结束");
            }
        }
        public static void InsertAfterList(string insertname, ref string[] afterlist) {
            afterlist[afterlist.Length - 1] = insertname;
            string[] longlist = new string[(afterlist.Length + 1)];
            for (int i = 0; i < afterlist.Length; i++) {
                longlist[i] = afterlist[i];
            }
            afterlist = longlist;
            longlist = null;
        }
        public static void RemoveFromBeforeList(int removeindex, ref string[] beforelist) {
            if (removeindex == (beforelist.Length - 1)) {
                beforelist[removeindex] = "";
            }
            else {
                int i = 0;
                for (i = removeindex; i < (beforelist.Length - 1); i++) {
                    beforelist[i] = beforelist[i + 1];
                }
            }
            if (beforelist.Length > 1) {
                string[] shortlist = new string[(beforelist.Length - 1)];
                for (int i = 0; i < beforelist.Length - 1; i++) {
                    shortlist[i] = beforelist[i];
                }
                beforelist = shortlist;
                shortlist = null;
            }
            else {
                beforelist = null;
            }
        }
        public static void PrintNameList(string[] list) {
            Console.WriteLine("下面输出人员列表：");
            for (int i = 0; i < list.Length; i++) {
                Console.Write(list[i] + "\t");
            }
            Console.WriteLine();
            Console.WriteLine("输出人员列表结束");
        }
    }
}