把已有的集合重置

 /// <summary>
        /// 随机一个重置集合
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="inputList"></param>
        /// <returns></returns>
        public static List<T> GetRandomList<T>(List<T> inputList)
        {
            //Copy to a array
            T[] copyArray = new T[inputList.Count];
            inputList.CopyTo(copyArray);

            //Add range
            List<T> copyList = new List<T>();
            copyList.AddRange(copyArray);

            //Set outputList and random
            List<T> outputList = new List<T>();
            Random rd = new Random(DateTime.Now.Millisecond);

            while (copyList.Count > 0)
            {
                //Select an index and item
                int rdIndex = rd.Next(0, copyList.Count - 1);
                T remove = copyList[rdIndex];

                //remove it from copyList and add it to output
                copyList.Remove(remove);
                outputList.Add(remove);
            }
            return outputList;
        }