自动编码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Text.RegularExpressions;

namespace TESTIP
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int i = 0;
            if (ofdfile.ShowDialog() == DialogResult.OK)
            {
                using (FileStream fileStream = File.OpenRead(ofdfile.FileName))
                {
                    Encoding readEncoding = GetFileEncoding(ofdfile.FileName);

                    using (StreamReader streamreader = new StreamReader(fileStream, readEncoding))
                    {

                        string lines = null;
                        while ((lines = streamreader.ReadLine()) != null)
                        {

                            richTextBox1.AppendText(lines);
                            i++;

                        }
                    }
                }
                MessageBox.Show(i.ToString());
            }
        }

        public static System.Text.Encoding GetFileEncoding(string fileFullName)
        {
            FileStream fs = new FileStream(fileFullName, FileMode.Open, FileAccess.Read);
            System.Text.Encoding r = GetType(fs);
            fs.Close();
            return r;
        }

        public static System.Text.Encoding GetType(FileStream fs)
        {
            /*
             * byte[] Unicode=new byte[]{0xFF,0xFE};  
             * byte[] UnicodeBIG=new byte[]{0xFE,0xFF};  
             * byte[] UTF8=new byte[]{0xEF,0xBB,0xBF};
             */
            BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default);
            byte[] ss = r.ReadBytes(3);
            r.Close();
            //编码类型 Coding=编码类型.ASCII;   
            if (ss[0] >= 0xEF)
            {
                if (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF)
                {
                    return System.Text.Encoding.UTF8;
                }
                else if (ss[0] == 0xFE && ss[1] == 0xFF)
                {
                    return System.Text.Encoding.BigEndianUnicode;
                }
                else if (ss[0] == 0xFF && ss[1] == 0xFE)
                {
                    return System.Text.Encoding.Unicode;
                }
                else
                {
                    return System.Text.Encoding.Default;
                }
            }
            else
            {
                return System.Text.Encoding.Default;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Regex regExp = new Regex(@"^(?<ip>(?:25[0-5]|2[0-4]\d|1\d{0,2}|[1-9]\d?)\.(?:(?:25[0-5]|2[0-4]\d|1\d{0,2}|\d{1,2})\.){2}(?:25[0-5]|2[0-4]\d|1\d{0,2}|\d{1,2}))(:(?<port>\d{0,5}))?$[\s|\S]*");
            string[] lines = richTextBox1.Lines;
            StringBuilder textBuilder = new StringBuilder();
            int i = 0;
            foreach (string t in lines)
            {
                Match m = regExp.Match(t);
                i++;
                //if (!m.Success)
                //{
                //    textBuilder.Append("Test text is" + Environment.NewLine + t + Environment.NewLine + "Invalid for ip rule.\r\n");
                //    continue;
                //}
                //textBuilder.Remove(0, textBuilder.Length);
                if (m.Groups["ip"].Success)
                {
                    textBuilder.AppendLine("ip:" + m.Groups["ip"].Value);
                }
                else
                {
                    textBuilder.AppendLine("ip not found!");
                }
                //if (m.Groups["port"].Success)
                //{
                //    textBuilder.Append("port:" + m.Groups["port"].Value);
                //}
                //else
                //{
                //    textBuilder.AppendLine("port not found!");
                //}
               
            }
            richTextBox2.AppendText(textBuilder.ToString());
            richTextBox2.AppendText("\r\n\r\n"+i.ToString());
        }
    }
}