asp.net中怎么做一个上传大文件及下载的页面.请高手帮忙做一个。（要能上传2G的）

上传大文件的话 就是在web.config 文件的<system.web>节点下配置

<httpRuntime maxRequestLength="这里是你想要的文件大小" />

然后下载的话 如果非特殊文件用<A>标签就可以啦..这个还根据浏览器不同展示出不同的效果..

刚碰到这个问题，下面的代码可以直接拷贝使用。

protected void Page_Load(object sender, EventArgs e)

{

DownFile1(@"D:\常用软件\win7.iso", "win7.iso")

}

private void DownFile1(string filePath, string fileName)

{

ResponseFile(this.Request, this.Response, fileName, filePath, 1024000)

}

// 输出硬盘文件，提供下载

// 输入参数 _Request: Page.Request对象， _Response: Page.Response对象， _fileName: 下载文件名， _fullPath: 带文件名下载路径， _speed 每秒允许下载的字节数

// 返回是否成功

public static bool ResponseFile(HttpRequest _Request, HttpResponse _Response, string _fileName, string _fullPath, long _speed)

{

try

{

FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)

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((double)(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", "attachmentfilename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8))

br.BaseStream.Seek(startBytes, SeekOrigin.Begin)

int maxCount = (int)Math.Floor((double)((fileLength - startBytes) / pack)) + 1

for (int i = 0i <maxCounti++)

{

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

}

---