源代码：C#实现简单的Tail

以下代码没有严格测试，能用，参数的地方有些错误，没有修正，自个看看
代码中打开文件如果要用OpenFileDialog需要首先设置main的线程模式，缺点是弹出的对话框居然跑到后面去了，每什么意思。，
我现在是将这个东西绑定到右键菜单了（嘻嘻，优化大师省事不少）
代码没有整理，有些乱，呵呵，草就的一个东西，就不苛求了

源代码
  1using System;
  2using System.Collections.Generic;
  3using System.Text;
  4using System.IO;
  5using System.Threading;
  6using System.Windows.Forms;
  7
  8namespace Tail
  9{
 10    class Program
 11    {
 12        static ConsoleColor USAGE = ConsoleColor.Red;
 13        static ConsoleColor P1 = ConsoleColor.Yellow;
 14        static ConsoleColor P2 = ConsoleColor.White;
 15        static bool m_block = false;
 16        static bool m_exit = false;
 17        private static void showFile(String strFileName)
 18        {
 19            System.Console.Title = Application.ProductName+">" + strFileName;
 20            long lfFileSize = -1;
 21            int nCount = 0;
 22            System.IO.FileStream fs = null;
 23            if (File.Exists(strFileName) == false)
 24            {
 25                System.Console.ForegroundColor = USAGE;
 26                System.Console.WriteLine("文件 "+strFileName+"没有找到!");
 27                m_block = true;
 28            }
 29            try
 30            {
 31                while (true)
 32                {
 33                    BlockOperation(ref strFileName, ref lfFileSize, ref nCount);
 34                    if (m_exit)
 35                    {
 36                        break;
 37                    }
 38                    if (m_block)
 39                    {
 40                        Thread.Sleep(200);
 41                        continue;
 42                    }
 43
 44                    FileInfo f = new FileInfo(strFileName);
 45                    if (lfFileSize < 0)
 46                    {
 47                        lfFileSize = Math.Max(0, f.Length - 255);
 48                    }
 49                    if (false == (lfFileSize == 0 || lfFileSize != f.Length))
 50                    {
 51                        Thread.Sleep(200);
 52                        continue;
 53                    }
 54                    if (f.Length < lfFileSize)
 55                    {
 56                        System.Console.ForegroundColor = USAGE;
 57                        System.Console.WriteLine();
 58                        System.Console.WriteLine("--------------文件变更，需要重新读取文件----------------------------");
 59                        lfFileSize = Math.Max(0, f.Length - 255);
 60                    }
 61                    fs = new FileStream(strFileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
 62                    fs.Seek(lfFileSize, SeekOrigin.Begin);
 63                    byte[] bs = new byte[4096];
 64                    int n = 0;
 65                    bool bBegin = true;
 66                    while ((n = fs.Read(bs, 0, 4096)) > 0)
 67                    {
 68                        if (bBegin)
 69                        {
 70                            nCount++;
 71                            System.Console.ForegroundColor = nCount % 2 == 0 ? P1 : P2;
 72                        }
 73                        System.Console.Write(System.Text.Encoding.Default.GetString(bs, 0, n));
 74                        bBegin = false;
 75                    }
 76                    lfFileSize = f.Length;
 77                    Thread.Sleep(500);
 78
 79                }
 80            }
 81            catch (Exception excep)
 82            {
 83            }
 84            finally
 85            {
 86                try
 87                {
 88                    if (null != fs)
 89                    {
 90                        fs.Close();
 91                    }
 92                }
 93                catch
 94                {
 95                }
 96            }
 97        }
 98
 99        private static void BlockOperation(ref String strFileName, ref long lfFileSize, ref int nCount)
100        {
101            if (m_block)
102            {
103                m_block = false;
104                System.Console.ForegroundColor = USAGE;
105                System.Console.WriteLine(Application.ProductName + "[" + Application.ProductVersion + "]" + Application.CompanyName);
106                System.Console.Write("输入命令[帮助输入?或者help]:");
107                String str = System.Console.ReadLine();
108                if (str != null && str.Trim().Length > 0)
109                {
110                    str = str.Trim().ToLower();
111                    if (str.Equals("clear"))
112                    {
113                        System.Console.Clear();
114                        m_block = true;
115                    }
116                    if (str.Equals("continue"))
117                    {
118                        m_block = false;
119                    }
120                    else if (str.Equals("exit") || str.Equals("bye"))
121                    {
122                        m_exit = true;
123                    }
124                    else if (str.Equals("?") || str.Equals("help"))
125                    {
126                        System.Console.WriteLine("continue:继续[回车]");
127                        System.Console.WriteLine("clear:清除当前的屏幕");
128                        System.Console.WriteLine("exit:退出");
129                        System.Console.WriteLine("open:打开文件 open filename");
130                        m_block = true;
131                    }
132                    else if (str.StartsWith("open"))
133                    {
134                        if (str.StartsWith("open "))
135                        {
136                            strFileName = str.Substring(5);
137                            if (File.Exists(strFileName) == false)
138                            {
139                                System.Console.ForegroundColor = USAGE;
140                                System.Console.WriteLine("文件 " + strFileName + "没有找到!");
141                                m_block = true;
142                            }
143                            nCount = 0;
144                            System.Console.Title = Application.ProductName+">" + strFileName;
145                            lfFileSize = -1;
146                        }
147                        else
148                        {
149                            System.Console.ForegroundColor = USAGE;
150                            System.Console.WriteLine("命令open的格式不正确!");
151                            m_block = true;
152                        }
153                    }
154                    else
155                    {
156                        System.Console.ForegroundColor = USAGE;
157                        System.Console.WriteLine("命令:"+str+"不能被识别!");
158                        m_block = true;
159                    }
160                }                
161            }
162        }
163        static void Main(string[] args)
164        {
165            System.Console.CancelKeyPress += new ConsoleCancelEventHandler(Console_CancelKeyPress);
166            System.Console.BufferWidth = 2048;
167            System.Console.BufferHeight = 1024;
168            if (args.Length <= 0)
169            {
170                //if (GetInput(null) == false)
171                {
172                    return;
173                }
174            }
175            else
176            {
177                //usage();
178                showFile(args[0]);
179            }
180        }
181
182        static void Console_CancelKeyPress(object sender, ConsoleCancelEventArgs e)
183        {
184            e.Cancel = true;
185            m_block = true;
186        }
187    }
188}
189