巧用泛型和Lambda解决只读对象的缓存技巧

    /// <summary>

    /// 只读缓存辅助

    /// </summary>

    /// <typeparam name="KeyType">键类型</typeparam>

    /// <typeparam name="ValueType">值类型</typeparam>

    public static class Cache<KeyType, ValueType>

    {

        public delegate ValueType GetValue(KeyType key);

        private static Dictionary<KeyType, ValueType> data=new Dictionary<KeyType,ValueType>();



        /// <summary>

        /// 获取缓存中的数据

        /// </summary>

        /// <param name="key">键</param>

        /// <param name="get">Lambda表达式,当缓存不存在时获取值的委托</param>

        /// <returns></returns>

        public static ValueType Get(KeyType key, GetValue get)

        {

            if (data.ContainsKey(key))

                return data[key];

            else

            {

                ValueType value = get(key);

                data.Add(key,value);

                return value;

            }

        }

    }


    /// <summary>

    /// 只读缓存辅助

    /// </summary>

    /// <typeparam name="KeyType">键类型</typeparam>

    /// <typeparam name="ValueType">值类型</typeparam>

    public static class Cache<KeyType, ValueType>

    {

        public delegate ValueType GetValue(KeyType key);

        private static Dictionary<KeyType, ValueType> data=new Dictionary<KeyType,ValueType>();



        /// <summary>

        /// 获取缓存中的数据

        /// </summary>

        /// <param name="key">键</param>

        /// <param name="get">Lambda表达式,当缓存不存在时获取值的委托</param>

        /// <returns></returns>

        public static ValueType Get(KeyType key, GetValue get)

        {

            if (data.ContainsKey(key))

                return data[key];

            else

            {

                ValueType value = get(key);

                data.Add(key,value);

                return value;

            }

        }

    }

 

使用例子:

反射MyModel对象所有属性并且缓存

 PropertyInfo[] MyProperty = Cache<Type, PropertyInfo[]>.Get(typeof(MyModel), p => p.GetProperties());

    public static class CacheHelpr<KeyType, ValueType>
    {
        public delegate ValueType GetValue(KeyType key);
        private static Dictionary<KeyType, ValueType> data=new Dictionary<KeyType,ValueType>();
        public static ValueType Get(KeyType key, GetValue get)
        {
            if (data.ContainsKey(key))
                return data[key];
            else
            {
                ValueType value = get(key);
                data.Add(key,value);
                return value;
            }
        }
    }