请教怎么用C#做一个下载的程序，他要用到什么知识，做下载程序的步骤？谢谢了

[wdmzshyx5]

谢谢

[wdmzshyx5]

UP

[yuchangfu]

UP UP UP

[yulitian]

你是想实现什么？
一个WebForm中的程序下载功能。还是一个WindForm的应用程序？
前者用这个类就可以实现了，代码不长，自己看。
后者，恐怕比较复杂了。

using System;
using System.Web;
using System.IO;
using System.Threading;
namespace Soft1000.Libs.DownLoad
{
/// <summary>
/// DownLoad 的摘要说明。
/// </summary>
public class DownLoad
{
public DownLoad()
{
//
// TODO: 在此处添加构造函数逻辑
//
}


/// <summary>
/// 输出硬盘文件，提供下载
/// </summary>
/// <param name="_Request">Page.Request对象</param>
/// <param name="_Response">Page.Response对象</param>
/// <param name="_fileName">下载文件名</param>
/// <param name="_fullPath">带文件名下载路径</param>
/// <param name="_speed"><每秒允许下载的字节数/param>
/// <returns>返回是否成功</returns>
public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)
{
try
{
//建立文件对象
FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
//建立流读对象
BinaryReader br = new BinaryReader(myFile);
try
{
_Response.AddHeader("Accept-Ranges", "bytes");
_Response.Buffer = false;
long fileLength = myFile.Length;
long startBytes = 0;

int pack = 10240; //10K bytes
//int sleep = 200; //每秒5次 即5*10K bytes每秒
int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
if (_Request.Headers["Range"] != null)
{
_Response.StatusCode = 206;
string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});
startBytes = Convert.ToInt64(range[1]);
}
_Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
if (startBytes != 0)
{
_Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));
}
_Response.AddHeader("Connection", "Keep-Alive");
_Response.ContentType = "application/octet-stream";
_Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );

br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;
for (int i = 0; i < maxCount; i++)
{
if (_Response.IsClientConnected)
{
_Response.BinaryWrite(br.ReadBytes(pack));
Thread.Sleep(sleep);
}
else
{
i=maxCount;

}
}
}
catch
{
return false;
}
finally
{
br.Close();
myFile.Close();
}
}
catch
{
return false;
}
return true;
}

}
}

[wdmzshyx5]

我想实现自动下载电影的功能，应该是WINDOWS应用程序里

[wdmzshyx5]

UP

[newdate]

关注！最近也在看有关的东西，下载可用WebClient类或HttpWebRequest类。不过我还不怎么会用:(