【C#源碼】判斷網路是否串連上

方法一：

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.Net.NetworkInformation;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            Ping a = new Ping();            PingReply re = a.Send("202.96.134.134");//得到PING傳回值            if (re.Status == IPStatus.Success)  //如果ping成功            {                label1.Text = "外網串連成功..";                label1.ForeColor = Color.Green;            }            else            {                label1.Text = "外網串連失敗";                label1.ForeColor = Color.Red;            }        }    }}

 

方法二：

using System; using System.Runtime.InteropServices;  namespace Network_status {     class Program     {         [DllImport("wininet.dll", EntryPoint = "InternetGetConnectedState")]         public extern static bool InternetGetConnectedState(out int conState, int reder);         //參數說明 constate 串連說明 ，reder保留值         public static bool IsConnectedToInternet()         {             int Desc=0;             return InternetGetConnectedState(out  Desc, 0);         }         public static void Main(string[] args)         {             while(true)             {                  if (IsConnectedToInternet())                  {                     Console.WriteLine("已串連在網上!");                     //通知我的Code....                  }                 else                 {                     Console.WriteLine("未串連在網上!");                  }                 System.Threading.Thread.Sleep(5000);             }         }     } }

原創文章，轉載請註明出處：http://www.cnblogs.com/hongfei