详解C#中普通缓存的使用

public class CacheHelper
    {
        //缓存容器 
        private static Dictionary<string, object> CacheDictionary = new Dictionary<string, object>();
        /// <summary>
        /// 添加缓存
        /// </summary>
        public static void Add(string key, object value)
        {
            CacheDictionary.Add(key, value);
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        public static T Get <T>(string key)
        {
            return (T)CacheDictionary[key];
        }


        /// <summary>
        /// 缓存获取方法
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key">缓存字典容器对应key</param>
        /// <param name="func">委托方法 传入操作对象</param>
        /// <returns></returns>
        public static T GetCache<T>(string key, Func<T> func)
        {
            T t = default(T);
            if (CacheHelper.Exsits(key))
            {
                //缓存存在，直接获取原数据
                t = CacheHelper.Get<T>(key);
            }
            else
            {
                //缓存不存在，去生成缓存，并加入容器
                t = func.Invoke();
                CacheHelper.Add(key, t);
            }
            return t;
        }

        /// <summary>
        /// 判断缓存是否存在
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static bool Exsits(string key)
        {
            return CacheDictionary.ContainsKey(key);
        }

public class DemoTest
    {
        /// <summary>
        /// 使用缓存测试
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        public static List<People> CacheTest(int count)
        {
            People people = new People();


            List<People> ListPeople = new List<People>();
            for (int i = count; i < 100000; i++)
            {
                Console.WriteLine($"------第{i}次请求------");
                //int result = DataSource.GetDataByDB(666);

                //key的名字一定要确保请求的准确性 DataSource GetDataByDB 666缺一不可
                string key = "DataSource_GetDataByDB_666";
                ListPeople = CacheHelper.GetCache(key, () => DemoTest.GetListData());
                Console.WriteLine($"第{i}次请求获得的数据为：{people}");
           
            }
            return ListPeople;
        }

        /// <summary>
        /// 没有使用缓存
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        public static List<People> NoCacheTest(int count)
        {
            People people = new People();


            List<People> ListPeople = new List<People>();
            for (int i = count; i < 100000; i++)
            {
                Console.WriteLine($"------第{i}次请求------");
                //int result = DataSource.GetDataByDB(666);

                //key的名字一定要确保请求的准确性 DataSource GetDataByDB 666缺一不可
                string key = "DataSource_GetDataByDB_666";

                //if (CacheHelper.Exsits(key))
                //{
                //    //缓存存在，直接获取原数据
                //    result = CacheHelper.Get<int>(key);
                //}
                //else
                //{
                //    //缓存不存在，去生成缓存，并加入容器
                //    result = 78;
                //    CacheHelper.Add(key, result);
                //}
                ListPeople = GetListData();
                Console.WriteLine($"第{i}次请求获得的数据为：{people}");
            }
            return ListPeople;

        }

        /// <summary>
        /// 读取数据源 这里模拟数据源读取 循环3000
        /// </summary>
        /// <returns></returns>
        public static List<People> GetListData()
        {
            List<People> peoplesList = new List<People>();


            for (int i = 0; i < 3000; i++)
            {
                People people = new People()
                {
                    Age = i,
                    Name = "陈大宝" + i.ToString()
                };

                peoplesList.Add(people);
            }return peoplesList;
        }
    }

class Program
    {
        static void Main(string[] args)
        {

            {
                Console.WriteLine("******************缓存测试****************");
                Stopwatch stopwatch = new Stopwatch();
                stopwatch.Start();

                var iResulr = DemoTest.CacheTest(0);

                stopwatch.Stop();

                Console.WriteLine("有缓存消耗时间为" + stopwatch.ElapsedMilliseconds);
            }
            {
                Console.WriteLine("*****************没有缓存测试****************");
                Stopwatch stopwatch = new Stopwatch();
                stopwatch.Start();

                var iResulr = DemoTest.NoCacheTest(0);

                stopwatch.Stop();

                Console.WriteLine("没有缓存消耗时间为" + stopwatch.ElapsedMilliseconds);
            }
        }
    }