实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; namespace RandomExtract { class Program { static void Main(string[] args) { PrizeMathRandom a = new PrizeMathRandom(); a.prizeRandom(); #region 1000、10000次随机抽取,每次抽取6个 ////从集合中随机抽取个数 //const ushort COUNT = 1; ////循环次数 //const int FOR_COUNT = 10000;//10000 //RandomController rc = new RandomController(COUNT); ////累积器 //Dictionary<char, int> result = new Dictionary<char, int>(); ////随机数生成器 //Random rand = new Random(); ////循环生成随机数 //for (int i = 0; i < FOR_COUNT; i ) //{ // //char[] rands = rc.RandomExtract(rand); // char[] rands = rc.ControllerRandomExtract(rand); // for (int j = 0; j < COUNT; j ) // { // char item = rands[j]; // if (result.ContainsKey(item)) // result[item] = 1; // else // result.Add(item, 1); // } // // Thread.Sleep(5); //} ////Console.WriteLine("\t\t出现次数\t占总共出现次数百分比"); ////foreach (KeyValuePair<char, int> item in result) ////{ //// Console.WriteLine(item.Key "\t\t" item.Value.ToString() "\t\t" ((double)item.Value / (double)(FOR_COUNT * COUNT)).ToString("0.00%")); ////} //Dictionary<char, ushort> items = new Dictionary<char, ushort>(); //for (int i = 0, j = rc.datas.Count; i < j; i ) //{ // items.Add(rc.datas[i], rc.weights[i]); //} //Console.WriteLine("\t\t出现次数\t占总共出现次数百分比\t权值"); //foreach (KeyValuePair<char, int> item in result) //{ // Console.WriteLine(item.Key "\t\t" item.Value.ToString() "\t\t" ((double)item.Value / (double)(FOR_COUNT * COUNT)).ToString("0.00%") "\t\t\t" items[item.Key]); //} #endregion Console.ReadLine(); } } public class Singleton { private static Singleton _Singleton = null; private static object Singleton_Lock = new object(); public static Singleton CreateInstance() { if (_Singleton == null) //双if lock { lock (Singleton_Lock) { Console.WriteLine("路过。"); if (_Singleton == null) { Console.WriteLine("被创建。"); _Singleton = new Singleton(); } } } return _Singleton; } } public class RandomController { #region Properties private int _Count; /// <summary> /// 随机抽取个数 /// </summary> public int Count { get { return _Count; } set { _Count = value; } } #endregion #region Member Variables /// <summary> /// 待随机抽取数据集合 /// </summary> public List<char> datas = new List<char>( new char[]{ 'A','B','C','D'//,'E','F', // 'G','H','I','J'//,'K'//,'L', //'M','N','O','P','Q','R', //'S','T','U','V','W','X', //'Y','Z' }); /// <summary> /// 对应奖项权值 /// </summary> public List<ushort> weights = new List<ushort>( new ushort[]{ //1,2,3,4,5,6, 7,8,9,10 //1,1,1,1,1,1, //1,1,1,1,1,1, //1,1 }); #endregion /// <summary> /// 构造函数 /// </summary> /// <param name="count">随机抽取个数</param> public RandomController(ushort count) { if (count > 26) throw new Exception("抽取个数不能超过数据集合大小!!"); _Count = count; } #region 普通随机抽取 /// <summary> /// 随机抽取 /// </summary> /// <param name="rand">随机数生成器</param> /// <returns></returns> public char[] RandomExtract(Random rand) { List<char> result = new List<char>(); if (rand != null) { for (int i = Count; i > 0;) { char item = datas[rand.Next(25)]; if (result.Contains(item)) continue; else { result.Add(item); i--; } } } return result.ToArray(); } #endregion #region 受控随机抽取 /// <summary> /// 随机抽取 /// </summary> /// <param name="rand">随机数生成器</param> /// <returns></returns> public char[] ControllerRandomExtract(Random rand) { List<char> result = new List<char>(); if (rand != null) { //临时变量 Dictionary<char, int> dict = new Dictionary<char, int>(4); //为每个项算一个随机数并乘以相应的权值 for (int i = datas.Count - 1; i >= 0; i--) { dict.Add(datas[i], rand.Next(100) * weights[i]); } //排序 List<KeyValuePair<char, int>> listDict = SortByValue(dict); //拷贝抽取权值最大的前Count项 foreach (KeyValuePair<char, int> kvp in listDict.GetRange(0, Count)) { result.Add(kvp.Key); } } return result.ToArray(); } #endregion #region Tools /// <summary> /// 排序集合 /// </summary> /// <param name="dict"></param> /// <returns></returns> private List<KeyValuePair<char, int>> SortByValue(Dictionary<char, int> dict) { List<KeyValuePair<char, int>> list = new List<KeyValuePair<char, int>>(); if (dict != null) { list.AddRange(dict); list.Sort( delegate (KeyValuePair<char, int> kvp1, KeyValuePair<char, int> kvp2) { return kvp2.Value - kvp1.Value; }); } return list; } #endregion } public class PrizeMathRandom { Random rd = new Random(Guid.NewGuid().GetHashCode()); public int GetPrizeIndex(List<Prize> prizes) { int random = -1; try { //计算总权重 double sumWeight = prizes.Sum(x => x.prize_weight); //产生随机数 double randomNumber; randomNumber = rd.NextDouble(); //根据随机数在所有奖品分布的区域并确定所抽奖品 double d1 = 0; double d2 = 0; for (int i = 0; i < prizes.Count; i ) { d2 = Convert.ToDouble(prizes[i].prize_weight) / sumWeight; if (i == 0) { d1 = 0; } else { d1 = Convert.ToDouble(prizes[i - 1].prize_weight) / sumWeight; } if (randomNumber >= d1 && randomNumber <= d2) { random = i; break; } } } catch (Exception e) { Console.WriteLine("生成抽奖随机数出错,出错原因:" e.Message); } return random; } public void prizeRandom() { int i = 0; PrizeMathRandom a = new PrizeMathRandom(); List<Prize> prizes = new List<Prize>() { new Prize(){prize_name="奖1",prize_weight=1}, new Prize(){prize_name="奖2",prize_weight=2}, new Prize(){prize_name="奖3",prize_weight=4}, new Prize(){prize_name="奖4",prize_weight=2}, new Prize(){prize_name="奖5",prize_weight=1} }; int[] result = new int[prizes.Count]; Console.WriteLine("抽奖开始"); int count = 50; for (i = 1; i <= count; i )// 打印100个测试概率的准确性 { int selected = GetPrizeIndex(prizes); // Console.WriteLine("第" i "次抽中的奖品为:" prizes[selected].prize_name); result[selected] ; // Console.WriteLine("--------------------------------"); } Console.WriteLine("抽奖结束"); Console.WriteLine("总数:" count ",每种奖品抽到的数量为:"); for (int j = 0; j < prizes.Count; j ) { Console.WriteLine(prizes[j].prize_name ":" result[j] ";权重数:" prizes[j].prize_weight "概率:" result[j] * 1.0 / count); } } } public class Prize { public int id;//奖品id public String prize_name;//奖品名称 public int prize_amount;//奖品(剩余)数量 public int prize_weight;//奖品权重 //getter、setter } }
好例子网口号:伸出你的我的手 — 分享!
相关软件
小贴士
感谢您为本站写下的评论,您的评论对其它用户来说具有重要的参考价值,所以请认真填写。
- 类似“顶”、“沙发”之类没有营养的文字,对勤劳贡献的楼主来说是令人沮丧的反馈信息。
- 相信您也不想看到一排文字/表情墙,所以请不要反馈意义不大的重复字符,也请尽量不要纯表情的回复。
- 提问之前请再仔细看一遍楼主的说明,或许是您遗漏了。
- 请勿到处挖坑绊人、招贴广告。既占空间让人厌烦,又没人会搭理,于人于己都无利。
关于好例子网
本站旨在为广大IT学习爱好者提供一个非营利性互相学习交流分享平台。本站所有资源都可以被免费获取学习研究。本站资源来自网友分享,对搜索内容的合法性不具有预见性、识别性、控制性,仅供学习研究,请务必在下载后24小时内给予删除,不得用于其他任何用途,否则后果自负。基于互联网的特殊性,平台无法对用户传输的作品、信息、内容的权属或合法性、安全性、合规性、真实性、科学性、完整权、有效性等进行实质审查;无论平台是否已进行审查,用户均应自行承担因其传输的作品、信息、内容而可能或已经产生的侵权或权属纠纷等法律责任。本站所有资源不代表本站的观点或立场,基于网友分享,根据中国法律《信息网络传播权保护条例》第二十二与二十三条之规定,若资源存在侵权或相关问题请联系本站客服人员,点此联系我们。关于更多版权及免责申明参见 版权及免责申明
网友评论
我要评论