【NET Core】 缓存 MemoryCache 和 Redis

缓存接口 ICacheService

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace WebAppNetCore.Interface
{
    public interface ICacheService
    {
        /// <summary>
        /// 验证缓存项是否存在
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        bool Exists(string key);

        /// <summary>
        /// 验证缓存项是否存在（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        Task<bool> ExistsAsync(string key);

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <returns></returns>
        bool Add(string key, object value);

        /// <summary>
        /// 添加缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <returns></returns>
        Task<bool> AddAsync(string key, object value);

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);

        /// <summary>
        /// 添加缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        Task<bool> AddAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false);

        /// <summary>
        /// 添加缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        Task<bool> AddAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false);

        /// <summary>
        /// 删除缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        bool Remove(string key);

        /// <summary>
        /// 删除缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        Task<bool> RemoveAsync(string key);

        /// <summary>
        /// 批量删除缓存
        /// </summary>
        /// <param name="key">缓存Key集合</param>
        /// <returns></returns>
        void RemoveAll(IEnumerable<string> keys);

        /// <summary>
        /// 批量删除缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key集合</param>
        /// <returns></returns>
        Task RemoveAllAsync(IEnumerable<string> keys);

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        T Get<T>(string key) where T : class;

        /// <summary>
        /// 获取缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        Task<T> GetAsync<T>(string key) where T : class;

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        object Get(string key);

        /// <summary>
        /// 获取缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        Task<object> GetAsync(string key);

        /// <summary>
        /// 获取缓存集合
        /// </summary>
        /// <param name="keys">缓存Key集合</param>
        /// <returns></returns>
        IDictionary<string, object> GetAll(IEnumerable<string> keys);

        /// <summary>
        /// 获取缓存集合（异步方式）
        /// </summary>
        /// <param name="keys">缓存Key集合</param>
        /// <returns></returns>
        Task<IDictionary<string, object>> GetAllAsync(IEnumerable<string> keys);

        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <returns></returns>
        bool Replace(string key, object value);

        /// <summary>
        /// 修改缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <returns></returns>
        //Task<bool> ReplaceAsync(string key, object value);

        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);

        /// <summary>
        /// 修改缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        //Task<bool> ReplaceAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte);

        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false);

        /// <summary>
        /// 修改缓存（异步方式）
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        //Task<bool> ReplaceAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false);
    }
}

缓存实现类 MemoryCacheService

using Microsoft.Extensions.Caching.Memory;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using WebAppNetCore.Interface;

namespace WebAppNetCore.Services
{
    public class MemoryCacheService : ICacheService
    {
        protected IMemoryCache _cache;
        public MemoryCacheService(IMemoryCache cache)
        {
            _cache = cache;
        }

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <returns></returns>
        public bool Add(string key, object value)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            _cache.Set(key, value);
            return Exists(key);
        }
        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        public bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            _cache.Set(key, value,
                    new MemoryCacheEntryOptions()
                    .SetSlidingExpiration(expiresSliding)
                    .SetAbsoluteExpiration(expiressAbsoulte)
                    );

            return Exists(key);
        }
        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        public bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            if (isSliding)
                _cache.Set(key, value,
                    new MemoryCacheEntryOptions()
                    .SetSlidingExpiration(expiresIn)
                    );
            else
                _cache.Set(key, value,
                new MemoryCacheEntryOptions()
                .SetAbsoluteExpiration(expiresIn)
                );

            return Exists(key);
        }
        public Task<bool> AddAsync(string key, object value)
        {
            throw new NotImplementedException();
        }

        public Task<bool> AddAsync(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            throw new NotImplementedException();
        }

        public Task<bool> AddAsync(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// 验证缓存项是否存在
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public bool Exists(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            object cached;
            return _cache.TryGetValue(key, out cached);
        }

        public Task<bool> ExistsAsync(string key)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public T Get<T>(string key) where T : class
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            return _cache.Get(key) as T;
        }
        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public object Get(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            return _cache.Get(key);
        }
        /// <summary>
        /// 获取缓存集合
        /// </summary>
        /// <param name="keys">缓存Key集合</param>
        /// <returns></returns>
        public IDictionary<string, object> GetAll(IEnumerable<string> keys)
        {
            if (keys == null)
            {
                throw new ArgumentNullException(nameof(keys));
            }

            var dict = new Dictionary<string, object>();

            keys.ToList().ForEach(item => dict.Add(item, _cache.Get(item)));

            return dict;
        }

        public Task<IDictionary<string, object>> GetAllAsync(IEnumerable<string> keys)
        {
            throw new NotImplementedException();
        }

        public Task<T> GetAsync<T>(string key) where T : class
        {
            throw new NotImplementedException();
        }

        public Task<object> GetAsync(string key)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// 删除缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public bool Remove(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            _cache.Remove(key);

            return !Exists(key);
        }
        /// <summary>
        /// 批量删除缓存
        /// </summary>
        /// <param name="key">缓存Key集合</param>
        /// <returns></returns>
        public void RemoveAll(IEnumerable<string> keys)
        {
            if (keys == null)
            {
                throw new ArgumentNullException(nameof(keys));
            }

            keys.ToList().ForEach(item => _cache.Remove(item));
        }

        public Task RemoveAllAsync(IEnumerable<string> keys)
        {
            throw new NotImplementedException();
        }

        public Task<bool> RemoveAsync(string key)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <returns></returns>
        public bool Replace(string key, object value)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            if (Exists(key))
                if (!Remove(key)) return false;

            return Add(key, value);

        }
        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        public bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            if (Exists(key))
                if (!Remove(key)) return false;

            return Add(key, value, expiresSliding, expiressAbsoulte);
        }
        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        public bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }
            if (Exists(key))
                if (!Remove(key)) return false;

            return Add(key, value, expiresIn, isSliding);
        }

        public void Dispose()
        {
            if (_cache != null)
                _cache.Dispose();
            GC.SuppressFinalize(this);
        }
    }
}

缓存实现类 RedisCacheService

using Microsoft.Extensions.Caching.Redis;
using Newtonsoft.Json;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using WebAppNetCore.Interface;

namespace WebAppNetCore.Services
{
    public class RedisCacheService : ICacheService
    {
        protected IDatabase _cache;

        private ConnectionMultiplexer _connection;

        private readonly string _instance;

        public RedisCacheService(RedisCacheOptions options, int database = )
        {
            _connection = ConnectionMultiplexer.Connect(options.Configuration);
            _cache = _connection.GetDatabase(database);
            _instance = options.InstanceName;
        }

        /// <summary>
        /// 验证缓存项是否存在
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public bool Exists(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            return _cache.KeyExists(GetKeyForRedis(key));
        }

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <returns></returns>
        public bool Add(string key, object value)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            return _cache.StringSet(GetKeyForRedis(key), Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(value)));
        }
        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间,Redis中无效）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        public bool Add(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            return _cache.StringSet(GetKeyForRedis(key), Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(value)), expiressAbsoulte);
        }
        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间,Redis中无效）</param>
        /// <returns></returns>
        public bool Add(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            return _cache.StringSet(GetKeyForRedis(key), Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(value)), expiresIn);
        }

        /// <summary>
        /// 删除缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public bool Remove(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            return _cache.KeyDelete(GetKeyForRedis(key));
        }
        /// <summary>
        /// 批量删除缓存
        /// </summary>
        /// <param name="key">缓存Key集合</param>
        /// <returns></returns>
        public void RemoveAll(IEnumerable<string> keys)
        {
            if (keys == null)
            {
                throw new ArgumentNullException(nameof(keys));
            }

            keys.ToList().ForEach(item => Remove(item));
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public T Get<T>(string key) where T : class
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            var value = _cache.StringGet(GetKeyForRedis(key));

            if (!value.HasValue)
            {
                return default(T);
            }

            return JsonConvert.DeserializeObject<T>(value);
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <returns></returns>
        public object Get(string key)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            var value = _cache.StringGet(GetKeyForRedis(key));

            if (!value.HasValue)
            {
                return null;
            }
            return JsonConvert.DeserializeObject(value);
        }
        /// <summary>
        /// 获取缓存集合
        /// </summary>
        /// <param name="keys">缓存Key集合</param>
        /// <returns></returns>
        public IDictionary<string, object> GetAll(IEnumerable<string> keys)
        {
            if (keys == null)
            {
                throw new ArgumentNullException(nameof(keys));
            }
            var dict = new Dictionary<string, object>();

            keys.ToList().ForEach(item => dict.Add(item, Get(GetKeyForRedis(item))));

            return dict;
        }

        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <returns></returns>
        public bool Replace(string key, object value)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (Exists(key))
                if (!Remove(key))
                    return false;

            return Add(key, value);

        }
        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresSliding">滑动过期时长（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <param name="expiressAbsoulte">绝对过期时长</param>
        /// <returns></returns>
        public bool Replace(string key, object value, TimeSpan expiresSliding, TimeSpan expiressAbsoulte)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (Exists(key))
                if (!Remove(key))
                    return false;

            return Add(key, value, expiresSliding, expiressAbsoulte);
        }
        /// <summary>
        /// 修改缓存
        /// </summary>
        /// <param name="key">缓存Key</param>
        /// <param name="value">新的缓存Value</param>
        /// <param name="expiresIn">缓存时长</param>
        /// <param name="isSliding">是否滑动过期（如果在过期时间内有操作，则以当前时间点延长过期时间）</param>
        /// <returns></returns>
        public bool Replace(string key, object value, TimeSpan expiresIn, bool isSliding = false)
        {
            if (key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }

            if (Exists(key))
                if (!Remove(key)) return false;

            return Add(key, value, expiresIn, isSliding);
        }

        //这里我们写了个方法，来组合Key值和实例名，就是Key值转为 实例名+Key
        public string GetKeyForRedis(string key)
        {
            return _instance + key;
        }

        public void Dispose()
        {
            if (_connection != null)
                _connection.Dispose();
            GC.SuppressFinalize(this);
        }

    }
}

配置文件字段映射类

    public class AppsettingConfig
    {
        public string RedisConnection { get; set; }

        public string InstanceName { get; set; }

        public bool IsRedis { get; set; }
    }

starup：

       public void ConfigureServices(IServiceCollection services)
        {
            //注入redis或者memorycache
            CacheInjection.Initialize(services, _appsettingConfig.RedisConnection,_appsettingConfig.InstanceName,_appsettingConfig.IsRedis); 
        }

依赖注入

    public class CacheInjection
    {
        public static void Initialize(IServiceCollection services,string redisCon,string instanceName,bool isRedis = false)
        {
            //注册缓存服务
            services.AddMemoryCache();
            if (isRedis)
            {
                //Use Redis
                services.AddSingleton(typeof(ICacheService), new RedisCacheService(new RedisCacheOptions
                {
                    Configuration = redisCon,
                    InstanceName = instanceName
                }, ));
            }
            else
            {
                //Use MemoryCache
                services.AddSingleton<IMemoryCache>(factory =>
                {
                    var cache = new MemoryCache(new MemoryCacheOptions());
                    return cache;
                });
                services.AddSingleton<ICacheService, MemoryCacheService>();
            }
        }
    }

参考文章：https://www.cnblogs.com/yuangang/p/5800113.html