protected void Button1_Click(object sender, EventArgs e)
{ /* 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite 下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。 代码如下： */Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=z.zip"); string filename = Server.MapPath("DownLoad/aaa.zip"); Response.TransmitFile(filename); }//WriteFile实现下载
protected void Button2_Click(object sender, EventArgs e) { /* using System.IO; */string fileName ="aaa.zip";//客户端保存的文件名
string filePath=Server.MapPath("DownLoad/aaa.zip");//路径FileInfo fileInfo = new FileInfo(filePath);
Response.Clear(); Response.ClearContent(); Response.ClearHeaders(); Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); Response.AddHeader("Content-Length", fileInfo.Length.ToString()); Response.AddHeader("Content-Transfer-Encoding", "binary"); Response.ContentType = "application/octet-stream"; Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); Response.WriteFile(fileInfo.FullName); Response.Flush(); Response.End(); }//WriteFile分块下载
protected void Button3_Click(object sender, EventArgs e) {string fileName = "aaa.zip";//客户端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//路径System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
if (fileInfo.Exists == true)
{ const long ChunkSize = 102400;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力 byte[] buffer = new byte[ChunkSize];Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath); long dataLengthToRead = iStream.Length;//获取下载的文件总大小 Response.ContentType = "application/octet-stream"; Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName)); while (dataLengthToRead > 0 && Response.IsClientConnected) { int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小 Response.OutputStream.Write(buffer, 0, lengthRead); Response.Flush(); dataLengthToRead = dataLengthToRead - lengthRead; } Response.Close(); } }//流方式下载
protected void Button4_Click(object sender, EventArgs e) { string fileName = "aaa.zip";//客户端保存的文件名 string filePath = Server.MapPath("DownLoad/aaa.zip");//路径//以字符流的形式下载文件
FileStream fs = new FileStream(filePath, FileMode.Open); byte[] bytes = new byte[(int)fs.Length]; fs.Read(bytes, 0, bytes.Length); fs.Close(); Response.ContentType = "application/octet-stream"; //通知浏览器下载文件而不是打开 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)); Response.BinaryWrite(bytes); Response.Flush(); Response.End();}
根据url链接下载
var strUrl = Utils.DecryptString(url);
string fileName = GetFileNameFromUrl(strUrl);WebClient client = new WebClient();
var data= client.DownloadData(strUrl); return File(data, "application/octet-stream", fileName);