【小技巧】C#判断电脑是否联网

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; //添加特殊命名空间
using System.Runtime.InteropServices; namespace GPS解析上位机_在线版_ { public partial class Form1 : Form     { [DllImport("wininet")] //判断网络状况的方法,返回值true为连接，false为未连接 
        public extern static bool InternetGetConnectedState(out int conState, int reder); public Form1() { InitializeComponent(); int i = 0; if((InternetGetConnectedState(out i, 0)==true)) { MessageBox.Show("设备联网正常！"); } else { MessageBox.Show("设备不可联网！"); } } private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}