Song.ServiceImpls/QuestionsMethod/QuestionsCache.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Song.Entities;
using System.Timers;
using WeiSha.Common;
using Song.ServiceInterfaces;

namespace Song.ServiceImpls.QuestionsMethod
{
    /// <summary>
    /// 试题的缓存
    /// </summary>
    public class QuestionsCache
    {
        private static readonly QuestionsCache _questionsCache = new QuestionsCache();
        /// <summary>
        /// 试题的缓存对象
        /// </summary>
        public static QuestionsCache Singleton
        {
            get { return _questionsCache; }
        }
        /// <summary>
        /// 缓存序列
        /// </summary>
        private List<QuestionsCache_Item> list = new List<QuestionsCache_Item>();
        /// <summary>
        /// 缓存个数
        /// </summary>
        public int Count
        {
            get { return list.Count; }
        }
        System.Timers.Timer myTimer = null;
        private QuestionsCache()
        {
            int mm = 3;    //间隔执行的分钟数
            myTimer = new System.Timers.Timer(mm * 60 * 1000);
            myTimer.Elapsed += new ElapsedEventHandler(myTimer_Elapsed);
            myTimer.Enabled = true;
            myTimer.AutoReset = true;
            myTimer.Start();
        }
        /// <summary>
        /// 添加试题集
        /// </summary>
        /// <param name="ques"></param>
        /// <param name="expires"></param>
        public void Add(List<Questions> ques, int expires)
        {
            QuestionsCache_Item qcitem = new QuestionsCache_Item(ques, expires);
            list.Add(qcitem);
        }
        /// <summary>
        /// 添加试题集
        /// </summary>
        /// <param name="ques"></param>
        /// <param name="expires"></param>