按空格和制表符分割文本，求重构

split_text.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleTest
{
    class Program
    {
        /// <summary>
        /// 按空格或制表符分割文本，连续的空白字符会忽略，双引号或单引号括住的算一项，双引号里的双引号和单引号里的单引号前要加个转义的\
        /// </summary>
        static string[] splitText(string line)
        {
            if (string.IsNullOrEmpty(line))
                return new string[] { };

            List<string> result = new List<string>();
            StringBuilder sb = new StringBuilder();
            // 解析标志位：
            //  0: 正在解析字符
            //  1: 遇到左边的单引号
            //  2: 遇到左边的双引号
            //  3: 左单引号里遇到\
            //  4: 左双引号里遇到\
            int state = 0;

            foreach (char ch in line)
            {
                switch (ch)
                {
                    case ' ':
                    case '\t':
                        switch (state)
                        {
                            case 0:
                                if (sb.Length > 0)
                                {
                                    result.Add(sb.ToString());
                                    sb.Length = 0;
                                }
                                break;
                            case 1:
                            case 2:
                                sb.Append(ch);
                                break;
                            case 3:
                            case 4:
                                sb.Append('\\');
                                sb.Append(ch);
                                break;
                        }
                        break;
                    case '\'':
                        switch (state)
                        {
                            case 0:
                                state = 1;
                                break;
                            case 1:
                                state = 0;
                                result.Add(sb.ToString());
                                sb.Length = 0;
                                break;
                            case 2:
                                sb.Append(ch);
                                break;
                            case 3:
                                sb.Append('\'');
                                state = 1;
                                break;
                            case 4:
                                sb.Append('\\');
                                sb.Append(ch);
                                state = 2;
                                break;
                        }
                        break;
                    case '\"':
                        switch (state)
                        {
                            case 0:
                                state = 2;
                                break;
                            case 1:
                                sb.Append(ch);
                                break;
                            case 2:
                                state = 0;
                                result.Add(sb.ToString());
                                sb.Length = 0;
                                break;
                            case 3:
                                sb.Append('\\');
                                sb.Append(ch);
                                state = 1;
                                break;
                            case 4:
                                sb.Append('\"');
                                state = 2;
                                break;
                        }
                        break;
                    case '\\':
                        switch (state)
                        {
                            case 0:
                                sb.Append(ch);
                                break;
                            case 1:
                                state = 3;
                                break;
                            case 2:
                                state = 4;
                                break;
                            case 3:
                                sb.Append('\\');
                                sb.Append(ch);
                                break;
                            case 4:
                                sb.Append('\\');
                                sb.Append(ch);
                                break;
                        }
                        break;
                    default:
                        sb.Append(ch);
                        break;
                }
            }

            if (sb.Length > 0)
            {
                result.Add(sb.ToString());
            }
            return result.ToArray();
        }

        static void Main(string[] args)
        {
            string input = "11 22\t33\t\t44 \'55\t55\\\'55\\\"\' \"66\\\"66   66\'\"";
            Console.WriteLine(input);
            foreach (string item in splitText(input))
            {
                Console.WriteLine("\t|||{0}|||", item);
            }

            Console.ReadKey();
        }
    }
}

多谢，呵呵，我还没用这么高版本的.net，呵呵