static MemoryCacheTests()
        {
            for (int i = 0; i < 1000; i++)
            {
                var val = i.ToString();
                DictSm[val] = val;
                SlimCacheSm.Set(val, val, ExpiresDt);
                SysCacheSm.Add(val, val, Expires);
                ExtCacheSm.Set(val, val, Expires);
            }

            //for (int i = 0; i < 100_000; i++)
            //{
            //    var val = i.ToString();
            //    DictMd[val] = val;
            //    SlimCacheMd.Set(val, val, ExpiresDt);
            //    SysCacheMd.Add(val, val, Expires);
            //    ExtCacheMd.Set(val, val, Expires);
            //}

            //for (int i = 0; i < 1_000_000; i++)
            //{
            //    var val = i.ToString();
            //    DictLg[val] = val;
            //    SlimCacheLg.Set(val, val, ExpiresDt);
            //    SysCacheLg.Add(val, val, Expires);
            //    ExtCacheLg.Set(val, val, Expires);
            //}
        }
 public void ExtSetSm() => ExtCacheSm.Set("1234", "1234", Expires);