使用背景：
專案中用戶頻繁訪問資料庫會導致程式的卡頓，甚至堵塞，使用快取可以有效的降低用戶訪問資料庫的頻次，有效的減少并發的壓力，保護后端真實的服務器，
對于開發人員需要方便呼叫，所以本文提供了helper類對快取有了封裝，分了三個Cache,SystemCache,RedisCache(默認快取,系統快取,Redis快取)，話不多說，開擼！
使用方法：
1，參考CSRedisCore
可以看到，csredis支持.net40/.net45/.netstandard平臺，還是比較友好的，
2，增加helper類代碼
CacheHelper.cs
/// <summary> /// 快取幫助類 /// </summary> public class CacheHelper { /// <summary> /// 靜態建構式，初始化快取型別 /// </summary> static CacheHelper() { SystemCache = new SystemCache();
if(true)
//專案全域變數類，可自行定義
// if (GlobalSwitch.OpenRedisCache) { try { RedisCache = new RedisCache(GlobalSwitch.RedisConfig); } catch { } } switch (GlobalSwitch.CacheType) { case CacheType.SystemCache:Cache = SystemCache;break; case CacheType.RedisCache:Cache = RedisCache;break; default:throw new Exception("請指定快取型別！"); } } /// <summary> /// 默認快取 /// </summary> public static ICache Cache { get; } /// <summary> /// 系統快取 /// </summary> public static ICache SystemCache { get; } /// <summary> /// Redis快取 /// </summary> public static ICache RedisCache { get; } }
ICache.cs：
/// <summary> /// 快取操作介面類 /// </summary> public interface ICache { #region 設定快取 /// <summary> /// 設定快取 /// </summary> /// <param name="key">主鍵</param> /// <param name="value">值</param> void SetCache(string key, object value); /// <summary> /// 設定快取 /// 注：默認過期型別為絕對過期 /// </summary> /// <param name="key">主鍵</param> /// <param name="value">值</param> /// <param name="timeout">過期時間間隔</param> void SetCache(string key, object value, TimeSpan timeout); /// <summary> /// 設定快取 /// 注：默認過期型別為絕對過期 /// </summary> /// <param name="key">主鍵</param> /// <param name="value">值</param> /// <param name="timeout">過期時間間隔</param> /// <param name="expireType">過期型別</param> void SetCache(string key, object value, TimeSpan timeout, ExpireType expireType); /// <summary> /// 設定鍵失效時間 /// </summary> /// <param name="key">鍵值</param> /// <param name="expire">從現在起時間間隔</param> void SetKeyExpire(string key, TimeSpan expire); #endregion #region 獲取快取 /// <summary> /// 獲取快取 /// </summary> /// <param name="key">主鍵</param> object GetCache(string key); /// <summary> /// 獲取快取 /// </summary> /// <param name="key">主鍵</param> /// <typeparam name="T">資料型別</typeparam> T GetCache<T>(string key) where T : class; /// <summary> /// 是否存在鍵值 /// </summary> /// <param name="key">主鍵</param> /// <returns></returns> bool ContainsKey(string key); #endregion #region 洗掉快取 /// <summary> /// 清除快取 /// </summary> /// <param name="key">主鍵</param> void RemoveCache(string key); #endregion } #region 型別定義 /// <summary> /// 值資訊 /// </summary> public struct ValueInfoEntry { public string Value { get; set; } public string TypeName { get; set; } public TimeSpan? ExpireTime { get; set; } public ExpireType? ExpireType { get; set; } } /// <summary> /// 過期型別 /// </summary> public enum ExpireType { /// <summary> /// 絕對過期 /// 注：即自創建一段時間后就過期 /// </summary> Absolute, /// <summary> /// 相對過期 /// 注：即該鍵未被訪問后一段時間后過期，若此鍵一直被訪問則過期時間自動延長 /// </summary> Relative, } #endregion
RedisCache.cs
/// <summary> /// Redis快取 /// </summary> public class RedisCache : ICache { /// <summary> /// 建構式 /// 注意：請以單例使用 /// </summary> /// <param name="config">配置字串</param> public RedisCache(string config) { _redisCLient = new CSRedisClient(config); } private CSRedisClient _redisCLient { get; } public bool ContainsKey(string key) { return _redisCLient.Exists(key); } public object GetCache(string key) { object value = https://www.cnblogs.com/BFMC/p/null; var redisValue =https://www.cnblogs.com/BFMC/p/ _redisCLient.Get(key); if (redisValue.IsNullOrEmpty()) return null; ValueInfoEntry valueEntry = redisValue.ToString().ToObject<ValueInfoEntry>(); if (valueEntry.TypeName == typeof(string).AssemblyQualifiedName) value = valueEntry.Value; else value = valueEntry.Value.ToObject(Type.GetType(valueEntry.TypeName)); if (valueEntry.ExpireTime != null && valueEntry.ExpireType == ExpireType.Relative) SetKeyExpire(key, valueEntry.ExpireTime.Value); return value; } public T GetCache<T>(string key) where T : class { return (T)GetCache(key); } public void SetKeyExpire(string key, TimeSpan expire) { _redisCLient.Expire(key, expire); } public void RemoveCache(string key) { _redisCLient.Del(key); } public void SetCache(string key, object value) { _SetCache(key, value, null, null); } public void SetCache(string key, object value, TimeSpan timeout) { _SetCache(key, value, timeout, ExpireType.Absolute); } public void SetCache(string key, object value, TimeSpan timeout, ExpireType expireType) { _SetCache(key, value, timeout, expireType); } private void _SetCache(string key, object value, TimeSpan? timeout, ExpireType? expireType) { string jsonStr = string.Empty; if (value is string) jsonStr = value as string; else jsonStr = value.ToJson(); ValueInfoEntry entry = new ValueInfoEntry { Value = jsonStr, TypeName = value.GetType().AssemblyQualifiedName, ExpireTime = timeout, ExpireType = expireType }; string theValue =https://www.cnblogs.com/BFMC/p/ entry.ToJson(); if (timeout == null) _redisCLient.Set(key, theValue); else _redisCLient.Set(key, theValue, (int)timeout.Value.TotalSeconds); } }
SystemCache.cs
/// <summary> /// 系統快取幫助類 /// </summary> public class SystemCache : ICache { public object GetCache(string key) { return HttpRuntime.Cache[key]; } public T GetCache<T>(string key) where T : class { return (T)HttpRuntime.Cache[key]; } public bool ContainsKey(string key) { return GetCache(key) != null; } public void RemoveCache(string key) { HttpRuntime.Cache.Remove(key); } public void SetKeyExpire(string key, TimeSpan expire) { object value =https://www.cnblogs.com/BFMC/p/ GetCache(key); SetCache(key, value, expire); } public void SetCache(string key, object value) { _SetCache(key, value, null, null); } public void SetCache(string key, object value, TimeSpan timeout) { _SetCache(key, value, timeout, ExpireType.Absolute); } public void SetCache(string key, object value, TimeSpan timeout, ExpireType expireType) { _SetCache(key, value, timeout, expireType); } private void _SetCache(string key, object value, TimeSpan? timeout, ExpireType? expireType) { if (timeout == null) HttpRuntime.Cache[key] = value; else { if (expireType == ExpireType.Absolute) { DateTime endTime = DateTime.Now.AddTicks(timeout.Value.Ticks); HttpRuntime.Cache.Insert(key, value, null, endTime, Cache.NoSlidingExpiration); } else { HttpRuntime.Cache.Insert(key, value, null, Cache.NoAbsoluteExpiration, timeout.Value); } } } }
3，使用
4，說明：
Redis 是一個開源（BSD許可）的，記憶體中的資料結構存盤系統，它可以用作資料庫、快取和訊息中間件，
它是基于高性能的Key-Value、并提供多種語言的 API的非關系型資料庫，不過與傳統資料庫不同的是 redis 的資料是存在記憶體中的，所以存寫速度非常快，
它支持多種型別的資料結構，如 字串（strings）， 散列（hashes）， 串列（lists）， 集合（sets）， 有序集合（sorted sets）
結語：
這里提供了helper類，主要是為了封裝快取，使用起來更加方便，具體可以在其基礎上進行擴展，
從前慢，車馬慢， 一生只愛一個人，
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標籤：ASP.NET MVC
上一篇：快取中間件-Redis(二)