Exemplo n.º 1
0
        /// <summary>
        /// Tries to get value from Dictionary safely
        /// </summary>
        /// <typeparam name="TK"></typeparam>
        /// <typeparam name="T"></typeparam>
        /// <param name="dictionary"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static Maybe <T> Lookup <TK, T>(this IDictionary <TK, T> dictionary, TK key)
        {
            Contract.Requires(dictionary != null);

            var getter = MaybeFunctionalWrappers.Wrap <TK, T>(dictionary.TryGetValue);

            return(getter(key));
        }
        /// <summary>
        /// Tries to get value from Dictionary safely
        /// </summary>
        /// <typeparam name="TK"></typeparam>
        /// <typeparam name="T"></typeparam>
        /// <param name="dictionary"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static Maybe <T> Lookup <TK, T>(this IDictionary <TK, T> dictionary, TK key)
        {
            if (dictionary == null)
            {
                throw new ArgumentNullException("dictionary");
            }

            var getter = MaybeFunctionalWrappers.Wrap <TK, T>(dictionary.TryGetValue);

            return(getter(key));
        }
Exemplo n.º 3
0
        /// <summary>
        /// Tries to get value from Dictionary safely
        /// </summary>
        /// <typeparam name="TK"></typeparam>
        /// <typeparam name="T"></typeparam>
        /// <param name="dictionary"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static Maybe <T> Lookup <TK, T>(this IDictionary <TK, T> dictionary, TK key)
        {
            var getter = MaybeFunctionalWrappers.Wrap <TK, T>(dictionary.TryGetValue);

            return(getter(key));
        }
 /// <summary>
 /// If <paramref name="a"/> can be successfully casted to <typeparamref name="TR"/>, returns the casted one, wrapped as Maybe&lt;TR&gt;, otherwise Nothing
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <typeparam name="TR"></typeparam>
 /// <param name="a"></param>
 /// <returns></returns>
 public static Maybe <TR> MaybeCast <T, TR>(this T a) where TR : T
 {
     return(MaybeFunctionalWrappers.Catcher <T, TR, InvalidCastException>(o => (TR)o)(a));
 }