網上找的抽獎代碼都不滿意，自己動手豐衣足食，有需要的可以直接拿去用，不收版權費的。

/// <summary> /// 抽獎 /// </summary> public class Prize {/// <summary>/// 獎品關鍵字/// </summary>public string Key { get; set; }/// <summary>/// 權重/數量/// </summary>public int Poll { get; set; }/// <summary>/// 中獎區間/// </summary>class Area{/// <summary>/// 獎品關鍵字/// </summary>public string Key { get; set; }/// <summary>/// 開始索引位置/// </summary>public int Start { get; set; }/// <summary>/// 截止索引位置/// </summary>public int Over { get; set; }}/// <summary>/// 隨機種子/// </summary>static Random Rand = new Random((int)DateTime.Now.Ticks);/// <summary>/// 輪盤抽獎，權重值(在輪盤中占的面積大小)為中獎幾率/// </summary>/// <param name="prizeList">禮品列表（如果不是百分百中獎則輪空需要加入到列表里面）</param>/// <returns></returns>public static string Roulette(List<Prize> prizeList){if (prizeList == null || prizeList.Count == 0) return string.Empty;if (prizeList.Any(x => x.Poll < 1)) throw new ArgumentOutOfRangeException("poll權重值不能小于1");if (prizeList.Count == 1) return prizeList[0].Key; //只有一種禮品 Int32 total = prizeList.Sum(x => x.Poll); //權重和 if (total > 1000) throw new ArgumentOutOfRangeException("poll權重和不能大于1000"); //數組存儲空間的限制。最多一千種獎品（及每種獎品的權重值都是1） List<int> speed = new List<int>(); //隨機種子for (int i = 0; i < total; i++) speed.Add(i);int pos = 0;Dictionary<int, string> box = new Dictionary<int, string>();foreach (Prize p in prizeList){for (int c = 0; c < p.Poll; c++) //權重越大所占的面積份數就越多 {pos = Prize.Rand.Next(speed.Count); //取隨機種子坐標box[speed[pos]] = p.Key; //亂序 禮品放入索引是speed[pos]的箱子里面speed.RemoveAt(pos); //移除已抽取的箱子索引號 }}return box[Prize.Rand.Next(total)];}/// <summary>/// 獎盒抽獎，每個參與者對應一個獎盒，多少人參與就有多少獎盒/// </summary>/// <param name="prizeList">禮品列表</param>/// <param name="peopleCount">參與人數</param>/// <returns></returns>public static string LunkyBox(List<Prize> prizeList, int peopleCount){if (prizeList == null || prizeList.Count == 0) return string.Empty;if (prizeList.Any(x => x.Poll < 1)) throw new ArgumentOutOfRangeException("poll禮品數量不能小于1個");if (peopleCount < 1) throw new ArgumentOutOfRangeException("參數人數不能小于1人");if (prizeList.Count == 1 && peopleCount <= prizeList[0].Poll) return prizeList[0].Key; //只有一種禮品且禮品數量大于等于參與人數int pos = 0;List<Area> box = new List<Area>();foreach (Prize p in prizeList){box.Add(new Area() { Key = p.Key, Start = pos, Over = pos + p.Poll }); //把禮品放入獎盒區間pos = pos + p.Poll;}int total = prizeList.Sum(x => x.Poll); //禮品總數int speed = Math.Max(total, peopleCount); //取禮品總數和參數總人數中的最大值 pos = Prize.Rand.Next(speed);Area a = box.FirstOrDefault(x => pos >= x.Start && pos < x.Over); //查找索引在獎盒中對應禮品的位置return a == null ? string.Empty : a.Key;}}/* List<Prize> prizes = new List<Prize>(); prizes.Add(new Prize() { Key = "電腦", Poll = 1 }); prizes.Add(new Prize() { Key = "機柜", Poll = 2 }); prizes.Add(new Prize() { Key = "鼠標", Poll = 3 });string lp1 = Prize.LunkyBox(prizes, 6); Console.WriteLine(lp1);prizes.Add(new Prize() { Key = "謝謝惠顧", Poll = 5 }); string lp2 = Prize.Roulette(prizes); Console.WriteLine(lp2); */

?

轉載于:https://www.cnblogs.com/jiang_zheng/p/4221040.html

總結

以上是生活随笔為你收集整理的抽奖算法的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。