first commit

Infrastructure/Cache/CacheHelper.cs

@@ -0,0 +1,150 @@
+using Microsoft.Extensions.Caching.Memory;
+using System;
+using System.Collections.Generic;
+using System.Collections;
+using System.Reflection;
+
+namespace DOAN.Common
+{
+    public class CacheHelper
+    {
+        public static MemoryCache Cache { get; set; }
+        static CacheHelper()
+        {
+            Cache = new MemoryCache(new MemoryCacheOptions
+            {
+                //SizeLimit = 1024
+            });
+        }
+
+        /// <summary>
+        /// 获取缓存
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="key"></param>
+        /// <returns></returns>
+        public static T GetCache<T>(string key) where T : class
+        {
+            if (key == null)
+                throw new ArgumentNullException(nameof(key));
+            //return Cache.Get(key) as T; //或者
+            return Cache.Get<T>(key);
+        }
+
+        /// <summary>
+        /// 获取缓存
+        /// </summary>
+        /// <param name="CacheKey"></param>
+        /// <returns></returns>
+        public static object GetCache(string CacheKey)
+        {
+            return Cache.Get<object>(CacheKey);
+        }
+
+        public static object Get(string CacheKey)
+        {
+            return Cache.Get(CacheKey);
+        }
+
+        /// <summary>
+        /// 设置缓存，永久缓存
+        /// </summary>
+        /// <param name="CacheKey">key</param>
+        /// <param name="objObject">值</param>
+        public static object SetCache(string CacheKey, object objObject)
+        {
+            return Cache.Set(CacheKey, objObject);
+        }
+
+        /// <summary>
+        /// 设置缓存
+        /// </summary>
+        /// <param name="CacheKey">key</param>
+        /// <param name="objObject">值</param>
+        /// <param name="Timeout">过期时间（分钟）</param>
+        public static object SetCache(string CacheKey, object objObject, int Timeout)
+        {
+            return Cache.Set(CacheKey, objObject, DateTime.Now.AddMinutes(Timeout));
+        }
+
+        /// <summary>
+        /// 设置缓存(秒)
+        /// </summary>
+        /// <param name="CacheKey">key</param>
+        /// <param name="objObject">值</param>
+        /// <param name="Timeout">过期时间（秒）</param>
+        public static void SetCaches(string CacheKey, object objObject, int Timeout)
+        {
+            Cache.Set(CacheKey, objObject, DateTime.Now.AddSeconds(Timeout));
+        }
+
+        /// <summary>
+        /// 设置缓存
+        /// </summary>
+        /// <param name="CacheKey">key</param>
+        /// <param name="objObject">值</param>
+        /// <param name="absoluteExpiration">过期时间</param>
+        /// <param name="slidingExpiration">过期时间间隔</param>
+        public static object SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
+        {
+            return Cache.Set(CacheKey, objObject, absoluteExpiration);
+        }
+
+        /// <summary>
+        /// 设定绝对的过期时间
+        /// </summary>
+        /// <param name="CacheKey"></param>
+        /// <param name="objObject"></param>
+        /// <param name="Seconds">超过多少秒后过期</param>
+        public static void SetCacheDateTime(string CacheKey, object objObject, long Seconds)
+        {
+            Cache.Set(CacheKey, objObject, DateTime.Now.AddSeconds(Seconds));
+        }
+
+        /// <summary>
+        /// 删除缓存
+        /// </summary>
+        /// <param name="key">key</param>
+        public static void Remove(string key)
+        {
+            Cache.Remove(key);
+        }
+
+        /// <summary>
+        /// 验证缓存项是否存在
+        /// </summary>
+        /// <param name="key">缓存Key</param>
+        /// <returns></returns>
+        public static bool Exists(string key)
+        {
+            if (key == null)
+                throw new ArgumentNullException(nameof(key));
+            return Cache.TryGetValue(key, out _);
+        }
+
+
+        /// <summary>
+        /// 获取所有缓存键
+        /// </summary>
+        /// <returns></returns>
+        public static List<string> GetCacheKeys()
+        {
+            const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
+            //var entries = Cache.GetType().GetField("_entries", flags).GetValue(Cache);
+
+            //.net7需要这样写 
+            var coherentState = Cache.GetType().GetField("_coherentState", flags).GetValue(Cache);
+            var entries = coherentState.GetType().GetField("_entries", flags).GetValue(coherentState);
+
+            var keys = new List<string>();
+            if (entries is not IDictionary cacheItems) return keys;
+            foreach (DictionaryEntry cacheItem in cacheItems)
+            {
+                keys.Add(cacheItem.Key.ToString());
+                //Console.WriteLine("缓存key=" +cacheItem.Key);
+            }
+            return keys;
+        }
+    }
+}
+