Sort using

工作环境的build.exe要求代码的using namespace 必须按字母顺序排列，今天被一直提示编译错误，浪费了我N久来手动排序，崩溃了，就想写一个小东西来排序using。

其实以前试过List<string>.Sort()，发现结果并不准确。于是今天晚上抽空自己写了一个，写完了才发现，原来之前一直都忘记trim掉using xxxx;最后面那个分号，所以才导致结果不可靠，郁闷ing。

不过写都写了，还是贴出来记载一下吧。

namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            TC1();        }        private static void TC1()        {            string s = @"using System.Data.SqlClient;  using System.Collections.Generic;  using System.Data;  using System.Text;  using System.IO;  using System;using System.Xml;  ";            //List<string> result = SortString(s.Split('\n'));            string[] results = s.Split('\n');            Trim(results);            List<string> result = new List<string>(results);            result.Sort();            foreach (string r in result)            {                Console.WriteLine(r);            }        }        /// <summary>        /// compare s1 and s2        /// </summary>        /// <param name="s1">s1</param>        /// <param name="s2">s2</param>        /// <returns>1 if s1>s2, 0 if s1==s2, -1 otherwise </returns>        private static int Compare(string s1, string s2)        {            if(s1 == s2)            {                return 0;            }            int len = FindTheMostLength(new string[] { s1, s2 });            for (int i = 0; i < len; i++)            {                if (i >= s1.Length)                {                    return -1;                }                if (i >= s2.Length)                {                    return 1;                }                if (s1[i] > s2[i])                {                    return 1;                }                else if (s1[i] < s2[i])                {                    return -1;                }                else                {                    continue;                }            }            throw new InvalidProgramException("should not be here");        }        private static List<string> SortString(string[] usings)        {            CheckStringArrayParam(usings);            if (usings.Length == 1)            {                return new List<string>(usings);            }            Trim(usings);            // check char one by one            for (int i = 0; i < usings.Length; i++)            {                for (int j = usings.Length - 1; j > i; j--)                {                    if (Compare(usings[j - 1], usings[j]) > 0)                    {                        string temp = usings[j];                        usings[j] = usings[j - 1];                        usings[j - 1] = temp;                        continue;                    }                    else                    {                        continue;                    }                }            }            List<string> sorted = new List<string>(usings);            return sorted;        }        private static void CheckStringArrayParam(string[] args)        {            if (args == null)            {                throw new ArgumentNullException("usings");            }            if (args.Length == 0)            {                throw new ArgumentException("usings is an empty array");            }        }        private static void Trim(string[] args)        {            CheckStringArrayParam(args);            for (int i = 0; i < args.Length; i++)            {                args[i] = args[i].Trim();                args[i] = args[i].TrimEnd(';');            }        }        private static int FindTheMostLength(string[] args)        {            CheckStringArrayParam(args);            if (args.Length == 1)            {                return args[0].Length;            }            int len = 0;            foreach (string s in args)            {                len = s.Length > len ? s.Length : len;            }            return len;        }    }}