网上找的抽奖代码都不满意,自己动手丰衣足食,有需要的可以直接拿去用,不收版权费的。
/// <summary> /// 抽奖 /// </summary> public class Prize { /// <summary> /// 奖品关键字 /// </summary> public string Key { get; set; } /// <summary> /// 权重/数量 /// </summary> public int Poll { get; set; } /// <summary> /// 中奖区间 /// </summary> class Area { /// <summary> /// 奖品关键字 /// </summary> public string Key { get; set; } /// <summary> /// 开始索引位置 /// </summary> public int Start { get; set; } /// <summary> /// 截止索引位置 /// </summary> public int Over { get; set; } } /// <summary> /// 随机种子 /// </summary> static Random Rand = new Random((int)DateTime.Now.Ticks); /// <summary> /// 轮盘抽奖,权重值(在轮盘中占的面积大小)为中奖几率 /// </summary> /// <param name="prizeList">礼品列表(如果不是百分百中奖则轮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权重值不能小于1"); if (prizeList.Count == 1) return prizeList[0].Key; //只有一种礼品 Int32 total = prizeList.Sum(x => x.Poll); //权重和 if (total > 1000) throw new ArgumentOutOfRangeException("poll权重和不能大于1000"); //数组存储空间的限制。最多一千种奖品(及每种奖品的权重值都是1) List<int> speed = new List<int>(); //随机种子 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++) //权重越大所占的面积份数就越多 { pos = Prize.Rand.Next(speed.Count); //取随机种子坐标 box[speed[pos]] = p.Key; //乱序 礼品放入索引是speed[pos]的箱子里面 speed.RemoveAt(pos); //移除已抽取的箱子索引号 } } return box[Prize.Rand.Next(total)]; } /// <summary> /// 奖盒抽奖,每个参与者对应一个奖盒,多少人参与就有多少奖盒 /// </summary> /// <param name="prizeList">礼品列表</param> /// <param name="peopleCount">参与人数</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礼品数量不能小于1个"); if (peopleCount < 1) throw new ArgumentOutOfRangeException("参数人数不能小于1人"); if (prizeList.Count == 1 && peopleCount <= prizeList[0].Poll) return prizeList[0].Key; //只有一种礼品且礼品数量大于等于参与人数 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 }); //把礼品放入奖盒区间 pos = pos + p.Poll; } int total = prizeList.Sum(x => x.Poll); //礼品总数 int speed = Math.Max(total, peopleCount); //取礼品总数和参数总人数中的最大值 pos = Prize.Rand.Next(speed); Area a = box.FirstOrDefault(x => pos >= x.Start && pos < x.Over); //查找索引在奖盒中对应礼品的位置 return a == null ? string.Empty : a.Key; } } /* List<Prize> prizes = new List<Prize>(); prizes.Add(new Prize() { Key = "电脑", Poll = 1 }); prizes.Add(new Prize() { Key = "机柜", Poll = 2 }); prizes.Add(new Prize() { Key = "鼠标", Poll = 3 }); string lp1 = Prize.LunkyBox(prizes, 6); Console.WriteLine(lp1); prizes.Add(new Prize() { Key = "谢谢惠顾", Poll = 5 }); string lp2 = Prize.Roulette(prizes); Console.WriteLine(lp2); */