C# 下载文件2

从服务下载压缩包 过程

发起请求 HttpWebRequest

断点续传 HttpWebRequest.AddRange()

获取服务资源的响应 HttpWebResponse

设置下载进度条 

解压压缩包 ZipFile

using System;
using System.IO;
using System.IO.Compression;
using System.Net;namespace Test01
{class Program{static void Main(string[] args){FileStream localFileStream = null;Stream responseStream = null;string url = "http://DotNet.test/Dome.zip";//下载到本地文件的路径string localpath = System.AppDomain.CurrentDomain.BaseDirectory + "Demo.zip";try{//想服务发出请求。HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);webRequest.Timeout = 10000;#region 断点续传//断点续传：如果文件存在，就获取文件的大小 N 单位(字节)long localFileLength = 0;//检查本地文件信息FileInfo info = new FileInfo(localpath);if (info.Exists){localFileLength = info.Length;webRequest.AddRange(localFileLength);localFileStream = info.Open(FileMode.Append, FileAccess.Write);}else{localFileStream = info.Create();}#endregion//获取服务器资源的响应HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();//获取请求返回的内容长度（压缩包的总体积）long totalBytes = webResponse.ContentLength;//获取响应流webResponse.GetResponseStream();byte[] by = new byte[1024];//获取字节数量int osize = responseStream.Read(by, 0, by.Length);//已下载数量 long tocalDownloadedByte = 0;//下载进度double percent = 0;while (osize > 0){先检查是否有按键请求,如果有,判断是否为回车键,如果是则退出循环                //if (Console.KeyAvailable && System.Console.ReadKey(true).Key == ConsoleKey.Enter)//{//isBreak = true;//break;//}tocalDownloadedByte += osize;//项文件写入localFileStream.Write(by, 0, osize);percent = tocalDownloadedByte / (float)totalBytes * 100;osize = responseStream.Read(by, 0, by.Length);Console.SetCursorPosition(0, 0);Console.WriteLine($"下载进度：{ (percent).ToString("F2") }% ");}localFileStream.Close();responseStream.Close();Console.SetCursorPosition(0, 1);Console.WriteLine("下载完成！");#region 解压文件string targetfolderName = localpath.Replace("Demo.zip", string.Empty);ZipFile.ExtractToDirectory(localpath, targetfolderName);//解压#endregion}catch (Exception ex){Console.WriteLine($"错误：{ ex.Message }");}finally{if (localFileStream != null){localFileStream.Close();}if (responseStream != null){responseStream.Close();}}Console.ReadKey();}}
}