TransmitFile實(shí)現(xiàn)下載????

protected void Button1_Click(object sender, EventArgs e)

???? {
???????? /*?
???????? 微軟為Response對象提供了一個新的方法TransmitFile來解決使用Response.BinaryWrite?
???????? 下載超過400mb的文件時導(dǎo)致Aspnet_wp.exe進(jìn)程回收而無法成功下載的問題。?
???????? 代碼如下：?
???????? */?
???????? Response.ContentType = "application/x-zip-compressed";
???????? Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
???????? string filename = Server.MapPath("DownLoad/z.zip");
???????? Response.TransmitFile(filename);
???? }
???? //WriteFile實(shí)現(xiàn)下載?
???? protected void Button2_Click(object sender, EventArgs e)
???? {
???????? /*?
???????? using System.IO;
???????? */
???????? string fileName = "asd.txt";//客戶端保存的文件名?
???????? string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑
???????? 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分塊下載?
???? protected void Button3_Click(object sender, EventArgs e)
???? {
???????? string fileName = "aaa.txt";//客戶端保存的文件名?
???????? string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑
???????? System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
???????? if (fileInfo.Exists == true)
???????? {
???????????? const long ChunkSize = 102400;//100K 每次讀取文件，只讀取100K，這樣可以緩解服務(wù)器的壓力?
???????????? byte[] buffer = new byte[ChunkSize];
???????????? Response.Clear();
???????????? System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
???????????? long dataLengthToRead = iStream.Length;//獲取下載的文件總大小?
???????????? 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));//讀取的大小?
???????????????? Response.OutputStream.Write(buffer, 0, lengthRead);
???????????????? Response.Flush();
???????????????? dataLengthToRead = dataLengthToRead - lengthRead;
???????????? }
???????????? Response.Close();
???????? }
???? }
???? //流方式下載?
???? protected void Button4_Click(object sender, EventArgs e)
???? {
???????? string fileName = "aaa.txt";//客戶端保存的文件名?
???????? string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑
???????? //以字符流的形式下載文件?
???????? 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";
???????? //通知瀏覽器下載文件而不是打開?
???????? Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
???????? Response.BinaryWrite(bytes);
???????? Response.Flush();
???????? Response.End();
???? }
//----------------------------------------------------------

public void DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )
{
　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires = 0;
　　WebForm.Response.Buffer = true;
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");
　　//'文件名稱
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");
　　WebForm.Response.ContentType = "Application/octet-stream";
　　//'文件內(nèi)容
　　WebForm.Response.Write(FileBody);//-----------
???? WebForm.Response.End();
}
//上面這段代碼是下載一個動態(tài)產(chǎn)生的文本文件，若這個文件已經(jīng)存在于服務(wù)器端的實(shí)體路徑，則可以通過下面的函數(shù)：
public void DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )
{
　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires = 0;
???? WebForm.Response.Buffer = true;
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");
　　//文件名稱
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );
　　WebForm.Response.ContentType = "Application/octet-stream";
　　//文件內(nèi)容
　　WebForm.Response.Write(System.IO.File.ReadAllBytes(FilePath));//---------
　　WebForm.Response.End();
}

轉(zhuǎn)載于:https://www.cnblogs.com/BlueFly/archive/2009/11/16/1603976.html

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