[更新]缓存管理的帮助类（MemoryCache版，需要.net 4以上）-白红宇

[更新]缓存管理的帮助类（MemoryCache版，需要.net 4以上）

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发布时间：2019-06-28

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本来想发布下新版Luke.Net，正好刚刚再次重构了缓存的帮助类这里发布下：

测试代码

[Fact]        public void SimpleTest()        {            ICache
     
       cacheMenager = MemoryCache
      
       .Instance;            var value = cacheMenager.Get(1, () => 1, TimeSpan.FromSeconds(10));            Assert.Equal(value, 1);            value = cacheMenager.Get(1, () => 2, TimeSpan.FromSeconds(10));            Assert.Equal(value, 1);            System.Threading.Thread.Sleep(10 * 1000);            value = cacheMenager.Get(1, () => 3, TimeSpan.FromSeconds(10));            Assert.Equal(value, 3);        }

接口

public interface ICache
     
           {        TV Get
      
       (TK cacheKey, Func
       
         getUncachedValue, DateTimeOffset dateTimeOffset);        TV Get
        
         (TK cacheKey, Func
         
           getUncachedValue, TimeSpan timeSpan);        void Remove(TK cacheKey);    }

用到的单例类

public class SingletonProvider
     
       where T : new()    {        SingletonProvider() { }        public static T Instance        {            get { return SingletonCreator.instance; }        }        class SingletonCreator        {            static SingletonCreator() { }            internal static readonly T instance = new T();        }    }

最后是更新后的缓存类，

public class MemoryCache
     
       : ICache
      
           {        private ObjectCache _memoryCache;        public static MemoryCache
       
         Instance        {            get { return SingletonProvider
        
         
          >.Instance; }        }        public MemoryCache() : this(null) { }        public MemoryCache(string name)        {            _memoryCache = new MemoryCache(string.Format("{0}-{1}-{2}", typeof(TK).Name, typeof(TV).Name, name));        }        public TV Get
          
           (TK cacheKey, Func
           
             getUncachedValue, DateTimeOffset dateTimeOffset) { if (_memoryCache.Contains(ParseKey(cacheKey))) { return (TV)_memoryCache[ParseKey(cacheKey)]; } else { var v = getUncachedValue(); object o = v; _memoryCache.Set(ParseKey(cacheKey), o, dateTimeOffset); return v; } } public TV Get
            
             (TK cacheKey, Func
             
               getUncachedValue, TimeSpan timeSpan) { return Get(cacheKey, getUncachedValue, new DateTimeOffset(DateTime.UtcNow + timeSpan)); } public void Remove(TK cacheKey) { _memoryCache.Remove(ParseKey(cacheKey)); } private string ParseKey(TK key) { return key.GetHashCode().ToString(); } }