手写C#缓存

namespace ConsoleCache
{
    public class CustomCache
    {
        static CustomCache()
        {
            //定时删除
            Task.Run(() =>
            {
                while (true)//死循环
                {
                    List<string> keyList = new List<string>();
                    foreach (var key in CustomCacheDictionary.Keys)
                    {
                        if (DateTime.Now > CustomCacheDictionary[key].Value)
                        {
                            keyList.Add(key);
                        }
                    }
                    keyList.ForEach(k => CustomCacheDictionary.Remove(k));
                }
            });
        }
        private static Dictionary<string, KeyValuePair<object,DateTime>> CustomCacheDictionary = new Dictionary<string, KeyValuePair<object, DateTime>>();

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key"></param>
        /// <param name="ovalue"></param>
        /// <param name="timeoutSecond"></param>
        public static void Save(string key, object ovalue,int timeoutSecond=1800)
        {
            CustomCacheDictionary.Add(key, new KeyValuePair<object, DateTime>(ovalue, DateTime.Now.AddSeconds(timeoutSecond)));
        }

        /// <summary>
        /// 获取
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public static T GetT<T>(string key)
        {
            return (T)CustomCacheDictionary[key].Key;
        }
        /// <summary>
        /// 检查时候存在
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static bool Exist(string key)
        {
            if (CustomCacheDictionary.ContainsKey(key))
            {
                var valueTime = CustomCacheDictionary[key];
                if (DateTime.Now > valueTime.Value)
                {
                    CustomCacheDictionary.Remove(key);
                    return false;
                }
                else
                {
                    return true;
                }
            }
            return false;
        }
        /// <summary>
        /// 删除所有
        /// </summary>
        public static void RemoveAll()
        {
            CustomCacheDictionary.Clear();
        }
        /// <summary>
        /// 选择性删除
        /// </summary>
        /// <param name="func"></param>
        public static void RemoveCondition(Func<string,bool> func)
        {
            List<string> keyList = new List<string>();
            foreach (var key in CustomCacheDictionary.Keys)
            {
                if (func.Invoke(key))
                {
                    keyList.Add(key);
                }
            }
            keyList.ForEach(k => CustomCacheDictionary.Remove(k));
        }

        /// <summary>
        /// 封装获取写入缓存并获取缓存
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="func"></param>
        /// <returns></returns>
        public static T GetData<T>(string key, Func<T> func)
        {
            T tResult = default(T);
            if (!CustomCache.Exist(key))
            {
                tResult = func.Invoke();
                CustomCache.Save(key,tResult);
            }
            else
            {
                tResult = CustomCache.GetT<T>(key);
            }
            return tResult;
        }
    }
}

namespace ConsoleCache
{
    /// <summary>
    /// 缓存字典
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            //string name = $"{nameof(CustomCache.GetData)}_1";
            //for (int i = 0; i < 4; i++)
            //{
            //    int Result = CustomCache.GetData<int>(name, () => DataSource.QueryByDB(123));
            //    Console.WriteLine(Result);
            //}

            CustomCache.Save("123_favorite_category_", new List<string>() { "编程语言", "移动开发" });
            CustomCache.Save("456_favorite_category_", new List<string>() { "编程语言", "移动开发", "平面设计" });
            CustomCache.Save("123_favorite_", new List<string>() { "编程语言", });
            CustomCache.RemoveCondition(s => s.Contains("_category_"));
        }

    }
}