List<T>对元素的查找。

            int search;
            List<string> list = new List<string>() { "public","private","protected"};
            list.Sort();                                                               //使用BinarySearch()之前要先排序
            search = list.BinarySearch("protected internal");
            if (search < 0)
            {
                list.Insert(~search, "protected internal");           //search按位取反后，就是要插入元素应该在的位置
            }
            foreach (string item in list)                                     //遍历输出
                Console.WriteLine(item);
            Console.ReadKey();