form1.cs

清华大学出版社出版的 移动应用开发宝典 张大威（2008）的附书源代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;

namespace DownloadFile
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnGet_Click(object sender, EventArgs e)
        {
            Uri u = new Uri(txtUrl.Text);
            Download(u, System.Environment.GetFolderPath(Environment.SpecialFolder.Personal));
 
        }

        private void Download(Uri address, string localPath)
        {
            string filename = address.Segments[address.Segments.Length - 1];

            WebRequest request = WebRequest.Create(address);

            //perform the GET request
            WebResponse response = request.GetResponse();

            //get stream containing received data
            Stream s = response.GetResponseStream();

            //open filestream for the output file
            FileStream fs = new FileStream(Path.Combine(localPath, filename), FileMode.Create, FileAccess.Write);

            //copy until all data is read
            byte[] buffer = new byte[1024];
            int bytesRead = s.Read(buffer, 0, buffer.Length);
            while (bytesRead > 0)
            {
                fs.Write(buffer, 0, bytesRead);
                bytesRead = s.Read(buffer, 0, buffer.Length);
            }

            //close both streams
            fs.Close();
            s.Close();
            response.Close();
        }

        private void btnHead_Click(object sender, EventArgs e)
        {
           
            System.Net.HttpWebRequest hwr = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(txtUrl.Text);

            hwr.Method = "HEAD";
            System.Net.WebResponse response = hwr.GetResponse();

            dataGrid1.DataSource = response.Headers;

        }
    }
}