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为了实现缓存管理功能，我们创建了一个名为 CacheManager 的类，该类旨在简化缓存操作并提供统一的接口。该类继承自 IHttpStorageObject 抽象类，确保与系统内其他组件保持一致性。为了方便调用，我们采用单例模式设计 CacheManager，这意味着只有一个实例可以被多次使用。
单例模式实例获取
使用GetInstance 方法可以获得 CacheManager 实例。该方法通过锁机制确保单次初始化，保证多线程环境下也能正常工作。缓存值获取与设置
this[key] 方法用于通过键获取缓存值。Get 方法提供更直接的值获取方式。Add 方法用于将键值对添加到缓存中，支持默认超时（20分钟）和自定义超时。Remove 方法用于删除指定键的缓存项。RemoveAll 方法用于清除所有缓存项，支持按键值表达式筛选删除。缓存项管理
ContainsKey 方法用于检查指定键是否存在于缓存中。GetAllKey 方法允许获取所有缓存键，方便管理和清理缓存。using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Web;using System.Web.Caching;namespace SyntacticSugar{ public class CacheManager : IHttpStorageObject { private static readonly CacheManager _instance; private static readonly object _instanceLock = new object(); private CacheManager() { Minutes = 60; } public static CacheManager GetInstance() { lock (_instanceLock) { if (_instance == null) _instance = new CacheManager (); } return _instance; } public override T this[string key] { get { return (T)HttpRuntime.Cache[CreateKey(key)]; } } public override bool ContainsKey(string key) { return HttpRuntime.Cache[CreateKey(key)] != null; } public override T Get(string key) { return (T)HttpRuntime.Cache.Get(CreateKey(key)); } public override void Add(string key, T value) { Add(key, value, 20 * Minutes); } public override void Add(string key, T value, int cacheDurationInSeconds) { Add(key, value, cacheDurationInSeconds, CacheItemPriority.Default); } public override void Add(string key, T value, int cacheDurationInSeconds, CacheItemPriority priority) { string keyString = CreateKey(key); HttpRuntime.Cache.Insert(keyString, value, null, DateTime.Now.AddSeconds(cacheDurationInSeconds), Cache.NoSlidingExpiration, priority, null); } public override void Remove(string key) { HttpRuntime.Cache.Remove(CreateKey(key)); } public override void RemoveAll() { var cache = HttpRuntime.Cache; var keys = new List (); var enumerator = cache.GetEnumerator(); while (enumerator.MoveNext()) keys.Add((string)enumerator.Key); foreach (var key in keys) cache.Remove(key); } public override void RemoveAll(Func removeExpression) { var cache = HttpRuntime.Cache; var keys = cache.GetAllKey().Where(removeExpression).ToList(); foreach (var key in keys) Remove(key); } public override IEnumerable GetAllKey() { var enumerator = HttpRuntime.Cache.GetEnumerator(); while (enumerator.MoveNext()) yield return enumerator.Key.ToString(); } private string CreateKey(string key) { return "http_cache_" + key; } }} using System;using System.Collections.Generic;using System.Linq;namespace SyntacticSugar{ public abstract class IHttpStorageObject { public int Minutes = 60; public int Hour = 60 * 60; public int Day = 60 * 60 * 24; public System.Web.HttpContext Context => System.Web.HttpContext.Current; public abstract void Add(string key, T value); public abstract bool ContainsKey(string key); public abstract T Get(string key); public abstract IEnumerable GetAllKey(); public abstract void Remove(string key); public abstract void RemoveAll(); public abstract void RemoveAll(Func removeExpression); public abstract T this[string key] { get; } }} 本实现通过简化缓存操作和统一接口，为开发者提供了一个高效的缓存管理工具，同时确保了代码的可维护性和可扩展性。
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