c#关于判断网络连接正常与否的总结

来源：互联网发布：参加网络研修所思所想编辑：程序博客网时间：2024/04/30 04:34

本人最近做c#winform的项目，遇到了判断网络是否正常连接的问题。后来查出了以下几种方法，供大家学习参考。

1.方法一

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
namespace WindowsFormsApplication1
{
    public partial class Demo : Form
    {
        public Demo()
        {
            InitializeComponent();
        }
        //判断
        private void btpanduan_Click(object sender, EventArgs e)
        {
            //210.192.120.228 163网易
            string ip = this.txtip.Text.ToString();
            int port = Convert .ToInt32( this.txtport.Text.ToString());
            bool a = panduan(ip, port );//135为本机服务端口号
            if (a == true)
            {
                MessageBox.Show("该网络连接正常！");
            }
            else
            {

                MessageBox.Show("该网络连接不畅通！");
            }
        }

// 异步调用

        //判断的方法
        public bool panduan(string ip, int port)
        {
            try
            {
                TcpClient client = new TcpClient(ip, port);
                if (client.Connected)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch
            {
                return false;
            }

}
}
}

2.利用 c# ping类

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;
namespace WindowsFormsApplication1
{
    public partial class Demo3 : Form
    {
        public Demo3()
        {
            InitializeComponent();
        }

System.Net.NetworkInformation.Ping ping = new System.Net.NetworkInformation.Ping();
System.Net.NetworkInformation.PingReply res;

        //检查网络连接
        private void btcheck_Click(object sender, EventArgs e)
        {

string url = this.txturl.Text.ToString();
bool a = check(url);

if (a == true)
{

MessageBox.Show("连接成功！", "提示信息");

            }
            else
            {

                MessageBox.Show("连接失败！", "提示信息");
            }
        }

public bool check(string url)
{

            try
            {
                res = ping.Send(url);

                if (res.Status == System.Net.NetworkInformation.IPStatus.Success)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch {

                return false;
            }
        }
    }
}