内存级的缓存实际上引用

    static void Main(string[] args)
        {
            var x = System.DateTime.Now;


            MemoryCache mc = new MemoryCache("my");

            var t = new testNumber()
            {
                I = 1
            };

            mc.Add(new CacheItem("i", t), new CacheItemPolicy
            {
                SlidingExpiration = new TimeSpan(1, 1, 1)
            });


            mc.Add(new CacheItem("j", t), new CacheItemPolicy
            {
                SlidingExpiration = new TimeSpan(1, 1, 1)
            });

            t.I = 2;



            var s = (testNumber)mc.Get("i");
            var s2 = (testNumber)mc.Get("j");


            Thread ta = new Thread(() =>
            {
                //mc = new MemoryCache("my");

                var k = (testNumber)mc.Get("i");
                var k2 = (testNumber)mc.Get("j");

                k.I++;

                Console.WriteLine("In thread:" + k.I);

                Console.WriteLine("In thread:" + k2.I);
            });

            ta.Start();

            Thread.Sleep(1000);

            Console.WriteLine(s2.I);

            Console.WriteLine(s.I);


            Console.ReadKey();

        }


        class testNumber
        {
            public int I { get; set; }
        }