如何在C#应用程序中执行测试网络连接

using System;
using System.Net.NetworkInformation;

public class NetworkTester
{
    public static bool TestConnection(string hostNameOrAddress)
    {
        try
        {
            Ping ping = new Ping();
            PingReply reply = ping.Send(hostNameOrAddress);
            
            if (reply.Status == IPStatus.Success)
            {
                Console.WriteLine("网络连接正常！");
                return true;
            }
            else
            {
                Console.WriteLine("无法连接到目标主机！");
                return false;
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("发生异常：" + ex.Message);
            return false;
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        string host = "www.example.com"; // 替换为要测试的主机名或IP地址
        NetworkTester.TestConnection(host);
    }
}

using System;
using System.Net.Sockets;

public class NetworkTester
{
    public static bool TestConnection(string hostNameOrAddress, int port)
    {
        try
        {
            TcpClient client = new TcpClient();
            client.Connect(hostNameOrAddress, port);
            
            if (client.Connected)
            {
                Console.WriteLine("网络连接正常！");
                return true;
            }
            else
            {
                Console.WriteLine("无法连接到目标主机！");
                return false;
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("发生异常：" + ex.Message);
            return false;
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        string host = "www.example.com"; // 替换为要测试的主机名或IP地址
        int port = 80; // 替换为要测试的端口号
        NetworkTester.TestConnection(host, port);
    }
}