巧用泛型和Lambda解決唯讀對象的緩衝技巧

    /// <summary>
    /// 唯讀緩衝輔助
    /// </summary>
    /// <typeparam name="KeyType">鍵類型</typeparam>
    /// <typeparam name="ValueType">實值型別</typeparam>
    public static class Cache<KeyType, ValueType>
    {
        public delegate ValueType GetValue(KeyType key);
        private static Dictionary<KeyType, ValueType> data=new Dictionary<KeyType,ValueType>();

        /// <summary>
        /// 擷取緩衝中的資料
        /// </summary>
        /// <param name="key">鍵</param>
        /// <param name="get">Lambda運算式,當緩衝不存在時擷取值的委託</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>
    /// 唯讀緩衝輔助
    /// </summary>
    /// <typeparam name="KeyType">鍵類型</typeparam>
    /// <typeparam name="ValueType">實值型別</typeparam>
    public static class Cache<KeyType, ValueType>
    {
        public delegate ValueType GetValue(KeyType key);
        private static Dictionary<KeyType, ValueType> data=new Dictionary<KeyType,ValueType>();

        /// <summary>
        /// 擷取緩衝中的資料
        /// </summary>
        /// <param name="key">鍵</param>
        /// <param name="get">Lambda運算式,當緩衝不存在時擷取值的委託</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對象所有屬性並且緩衝

 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;
            }
        }
    }