实现重定向输入

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Collections;
using System.Text.RegularExpressions;
using System.Diagnostics;
using System.ComponentModel;

namespace wf
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Equals("-s"))
            {
                if (Program.StartInfo.RedirectStandardInput == true)
                {
                    StreamReader ioInput = null;
                    ioInput = new StreamReader(Console.OpenStandardInput());
                    string textFileName;
                    Console.Write(">type ");
                    textFileName = Console.ReadLine();
                    StreamReader sreader = new StreamReader(@"C:\Users\dell-pc\desktop\test2.txt");
                    string afile = sreader.ReadToEnd();
                    afile = afile.ToLower();//转换为小写字母
                    //将空格跟标点符号定义出来
                    char[] c = { ‘ ‘, ‘,‘, ‘.‘, ‘?‘, ‘!‘, ‘:‘, ‘;‘, ‘\‘‘, ‘\"‘ };
                    //分隔char[c]后产生的数组
                    string[] S = afile.Split(c);
                    //建立哈希表
                    Hashtable ha = new Hashtable();
                    for (int i = 0; i < S.Length; i++)
                    {
                        if (ha.ContainsKey(S[i]))
                        {
                            ha[S[i]] = (int)ha[S[i]] + 1;
                        }
                        else
                        {
                            ha.Add(S[i], 1);
                        }
                    }
                    string[] arrKey = new string[ha.Count];//存键
                    int[] arrValue = new int[ha.Count];//存值
                    ha.Keys.CopyTo(arrKey, 0);
                    ha.Values.CopyTo(arrValue, 0);
                    Console.WriteLine();
                    Console.WriteLine(">wf -s test.txt");
                    Console.WriteLine("total " + ha.Count);
                    Console.WriteLine();
                    Array.Sort(arrValue, arrKey);//排序
                    int n = 0;
                    for (int i = arrKey.Length - 1; i >= 0; i--)
                    {
                        if ((string)arrKey[i] != "")
                        {
                            if (n < 10)
                            {
                                //输出前10位多的单词，右对齐
                                Console.Write(arrKey[i].ToString().PadRight(12));
                                Console.WriteLine(arrValue[i].ToString());
                                n = n + 1;
                            }
                        }
                    }
                }
            }
        }
    }
}