??????? 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(kāi)
??????? 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(gè)動(dòng)態(tài)產(chǎn)生的文本文件，若這個(gè)文件已經(jīng)存在于服務(wù)器端的實(shí)體路徑，則可以通過(guò)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();
}