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   源码介绍

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/// <summary>
    /// 抽奖类
    /// </summary>
    public class Lottery<T>
    {
        /// <summary>
        /// 抽奖次数
        /// </summary>
        public int  LotteryNumber { get; set; }
        /// <summary>
        /// 抽中事件
        /// </summary>
        public event EventHandler<LuckyEventArgs<T>> LuckEvent;
        /// <summary>
        /// 抽失败事件
        /// </summary>
        public event EventHandler<LuckyErrorEventArgs> LuckErrorEvent;
        /// <summary>
        /// 外部待要抽奖的清单列表
        /// </summary>
        private List<T> allList = new List<T>();
        /// <summary>
        /// 传进来的副本，内部初始化的时候使用
        /// </summary>
        private List<T> sourceList = new List<T>();
        /// <summary>
        /// 已中奖的清单列表
        /// </summary>
        private List<T> luckyList;
        /// <summary>
        /// 锁
        /// </summary>
        private object m_lock = new object();
        /// <summary>
        /// 构造方法
        /// </summary>
        /// <param name="allList"></param>
        public Lottery(List<T> allList)
        {
            this.init(allList,this.sourceList);
            this.allList = allList;
            this.luckyList = new List<T>();
        }
        /// <summary>
        /// 初始化要抽奖的数组
        /// </summary>
        /// <param name="list"></param>
        /// <param name="targetList"></param>
        private void init(List<T> list,List<T> targetList)
        {
            for (int i = 0; i < list.Count; i  )
            {
                targetList.Add(list[i]);
            }
        }
        /// <summary>
        /// 获得幸运号
        /// </summary>
        /// <returns></returns>
        public void GetLuckyNumber()
        {
            lock (m_lock)
            {
                T obj;
                Random r = new Random();
                int num = r.Next(allList.Count);
                if (this.allList.Count > 0)
                {
                    obj = this.allList[num];
                    LotteryNumber  ;
                    if (LuckEvent != null)
                    {
                        this.LuckEvent(null,new LuckyEventArgs<T>(obj,this.LotteryNumber));
                    }
                    //幸运号添加该列表
                    this.luckyList.Add(obj);
                    //待抽奖的列表里移除该幸运号
                    this.allList.Remove(obj);
                   // return obj;
                }
                else
                {
                    if (this.LuckErrorEvent != null)
                    {
                        this.LuckErrorEvent(null, new LuckyErrorEventArgs("没有可以抽奖的资源！"));
                    }
                }
            }
           
        }
        /// <summary>
        /// 获得幸运列表
        /// </summary>
        /// <returns></returns>
        public List<T> GetLuckyList()
        {
            return this.luckyList;
        }
        /// <summary>
        /// 重新初始化
        /// </summary>
        public void Reset()
        {
            this.allList.Clear();
            this.init(this.sourceList, this.allList);
            this.LotteryNumber = 0;
            this.luckyList.Clear();
        }
    }
    /// <summary>
    /// 抽奖成攻事件信息
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class LuckyEventArgs<T>:EventArgs
    {
        /// <summary>
        /// 被抽中的实体
        /// </summary>
        public readonly T args;
        /// <summary>
        /// 第几次抽奖
        /// </summary>
        public readonly int lotteryNumber;
        /// <summary>
        /// 抽奖产生的抽中事件
        /// </summary>
        /// <param name="args">抽中的实体信息</param>
        /// <param name="lotteryNumber">抽奖的次数值</param>
        public LuckyEventArgs(T args, int lotteryNumber)
        {
            this.args = args;
            this.lotteryNumber = lotteryNumber;
        }
    }
    /// <summary>
    /// 抽奖失败事件信息
    /// </summary>
    public class LuckyErrorEventArgs : EventArgs
    {
        /// <summary>
        /// 抽奖失败的消息
        /// </summary>
        public readonly string msg;
        /// <summary>
        /// 抽奖产生的抽奖失败事件
        /// </summary>
        /// <param name="args"></param>
        public LuckyErrorEventArgs(string msg)
        {
            this.msg = msg;
        }

    }