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   源码介绍

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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;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        private MyConnection conn = new MyConnection();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string urlStr = this.textUrl.Text ;

            if (urlStr == null || "".Equals(urlStr))
            {
                MessageBox.Show( "必须填写要防问的地址！");
                return;
            }

            int port = 80;

            try
            {
                port = Convert.ToInt32(this.textPort.Text);
            }
            catch
            {
                MessageBox.Show( "请填写正确的端口");
            }

            //可以为空
            string path = "/" this.textFile.Text;

            this.textBox1.Text = "";
            this.conn.StartAccess(urlStr, port, path, this.textBox1);
        }
    }
}