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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Net.NetworkInformation;


namespace WebDownload
{
    public partial class WebDownLoad : Form
    {
        public WebDownLoad()
        {
            InitializeComponent();
        }

        private void WebDownLoad_Load(object sender, EventArgs e)
        {

        }
        //这个
        private void btnDown_Click(object sender, EventArgs e)
        {
            WebClient WebClient = new WebClient();
            WebClient.DownloadFile("http://localhost:8080/w-brand.png", "web.jpg");
            this.picShowImage.ImageLocation = "web.jpg";
        }

        private void btnping_Click(object sender, EventArgs e)
        {
            Ping p = new Ping();
            if (this.txtip.Text == "")
            {
                MessageBox.Show("ip 不能为空");
            }
            else
            {
                MessageBox.Show(this.txtip.Text);
                PingReply pp = p.Send(this.txtip.Text);
                if (pp.Status == IPStatus.Success)
                {
                    MessageBox.Show("OK");
                }
                else
                {
                    MessageBox.Show("NO");
                }
            }

        }
    }
}