C# 下载文件并显示进度等信息

C# 下载文件并显示进度等信息

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

namespace WindowsFormsApp1
{<!-- -->
    public partial class Form1 : Form
    {<!-- -->
        private WebRequest httpRequest;
        private WebResponse httpResponse;
        private byte[] buffer;
        private Thread downloadThread;
        Stream ns;
        private string filename = Path.Combine( AppDomain.CurrentDomain.BaseDirectory,"1.war");
        private FileStream fs;
        private long length;
        private long downlength = 0;
        private long lastlength = 0;
        public delegate void updateData(string value); //设置委托用来更新主界面
        private int totalseconds = 0; //总用时
        private updateData UIDel; //
        public Form1()
        {<!-- -->
            InitializeComponent();
            buffer = new byte[100000];

        }

        private void button1_Click(object sender, EventArgs e)
        {<!-- -->
            httpRequest = WebRequest.Create("http://mirrors.jenkins.io/war-stable/latest/jenkins.war");
            httpResponse = httpRequest.GetResponse();
            //MessageBox.Show(httpResponse.ContentLength.ToString());
            length = httpResponse.ContentLength;
            this.progressBar1.Maximum = (int)length;
            this.progressBar1.Minimum = 0;
            downloadThread = new Thread(new ThreadStart(downloadFile));
            //showThread = new Thread(new ThreadStart(show));
            fs = new FileStream(filename, FileMode.OpenOrCreate, FileAccess.Write);
            downloadThread.Start();
            this.timer1.Enabled = true;
            // showThread.Start();
        }
        private void downloadFile()
        {<!-- -->

            ns = httpResponse.GetResponseStream();

            int i;
            UIDel = new updateData(updateUI);
            while ((i = ns.Read(buffer, 0, buffer.Length)) > 0)
            {<!-- -->

                downlength += i;
                string value = downlength.ToString();
                this.Invoke(UIDel, value);
                fs.Write(buffer, 0, i);
            }
            MessageBox.Show("下载完毕");
            this.timer1.Enabled = false;
            this.label3.BeginInvoke((Action)delegate{<!-- -->
                this.label3.Text = (length / (1024 * totalseconds)) + "KB/s";
            });

        }

        void updateUI(string value)
        {<!-- -->
            this.label1.Text = value;
            this.progressBar1.Value = Int32.Parse(value);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {<!-- -->

        }

        private void timer1_Tick_1(object sender, EventArgs e)
        {<!-- -->
            this.label2.Text = ((downlength - lastlength) / 1024) + "KB/S";
            lastlength = downlength;
            totalseconds++;
        }
    }
}