最简单的方法：使用RasDial命令
RasDial是Windows自带的命令，使用非常简单。实际使用是可将下面代码保存为一个批处理文件，然后直接运行或在程序里进行调用。
rasdial.exe /disconnect '断开连接
del "C:\Documents and Settings\hyuqin\Cookies\*.*" /Q '清除Cookie
rasdial.exe 连接名 连接账户 连接密码 '重新拨号
c# 代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.Diagnostics;
using System.Threading;
using System.Runtime;
using System.Runtime.InteropServices;
namespace RefreshIP
{
public partial class Dailer : Form
{
public Dailer()
{
InitializeComponent();
}
private static Mutex mutex=new Mutex();
private Process dailer = new Process();
private void Form1_Load(object sender, EventArgs e)
{
this.Visible = true;
}
#region Functions
int Desc;
//Creating the extern function...
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState(out int Description, int ReservedValue);
//Creating a function that uses the API function...
//if out parameter returns 18 then fail,if 81 then success
public void IsConnectedToInternet()
{
InternetGetConnectedState(out Desc, 0);
}
private void StopDailer()
{
//Process dailer = new Process();
//dailer.StartInfo.FileName = "close.bat";
//dailer.Start();
//dailer.Close();
while(Desc == 81)
{
lock (dailer)
{
if (!IsAlive("rundll32"))
{
mutex.WaitOne();
dailer.StartInfo.FileName = "rundll32.exe";
dailer.StartInfo.Arguments = "iedkcs32.dll CloseRASConnections";
dailer.Start();
//Thread.Sleep(1000);
mutex.ReleaseMutex();
}
//dailer.WaitForExit(1000);
//dailer.Close();
}
IsConnectedToInternet();
}
dailer.Close();
}
private void StartDailer()
{
//Process dailer = new Process();
//dailer.StartInfo.FileName = "connect.bat";
//dailer.Start();
//dailer.Close();
while(Desc != 81)
{
lock (dailer)
{
if (!IsAlive("rasdial"))
{
mutex.WaitOne();
dailer.StartInfo.FileName = "rasdial.exe";
dailer.StartInfo.Arguments = txtDail.Text.Trim()+" "+txtName.Text.Trim()+" "+txtPWD.Text.Trim();
dailer.Start();
mutex.ReleaseMutex();
}
//dailer.WaitForExit(1000);
//dailer.Close();
//Thread.Sleep(1000);
}
IsConnectedToInternet();
}
dailer.Close();
}
private bool IsAlive(string name)
{
Process[] ps = Process.GetProcessesByName(name);
if (ps.Length > 0)
{
return true;
}
else
{
return false;
}
}
private bool ValidateInput()
{
if (string.IsNullOrEmpty(txtDail.Text.Trim()))
{
MessageBox.Show("请输入宽带拨号名称！");
return false;
}
if (string.IsNullOrEmpty(txtName.Text.Trim()))
{
MessageBox.Show("请输入宽带拨号的用户名！");
return false;
}
if (string.IsNullOrEmpty(txtPWD.Text.Trim()))
{
MessageBox.Show("请输入宽带拨号的密码！");
return false;
}
return true;
}
#endregion
private void btnStart_Click(object sender, EventArgs e)
{
if (ValidateInput())
{
this.Visible = false;
this.notifyIcon1.Icon = new Icon("open.ico");
IsConnectedToInternet();
this.StartDailer();
}
}
private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void button2_Click(object sender, EventArgs e)
{
IsConnectedToInternet();
StopDailer();
this.notifyIcon1.Icon = new Icon("close.ico");
MessageBox.Show("程序已经暂停！");
}
private void btnMini_Click(object sender, EventArgs e)
{
this.Visible = false;
}
private void 设置ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Visible = true;
}
private void notifyIcon1_DoubleClick(object sender, EventArgs e)
{
this.Visible = !this.Visible;
}
private void btnOK_Click(object sender, EventArgs e)
{
if (ValidateInput())
{
this.Visible = false;
this.notifyIcon1.Icon = new Icon("open.ico");
IsConnectedToInternet();
this.StartDailer();
}
}
}
