}
//WriteFile分块下载
protectedvoidButton3_Click(objectsender,EventArgse)
{
stringfileName="aaa.txt";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.txt");//路径
System.IO.FileInfofileInfo=newSystem.IO.FileInfo(filePath);
if(fileInfo.Exists==true)
{
constlongChunkSize=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=newbyte[ChunkSize];
Response.Clear();
System.IO.FileStreamiStream=System.IO.File.OpenRead(filePath);
longdataLengthToRead=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)
{
intlengthRead=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
protectedvoidButton4_Click(objectsender,EventArgse)
{
stringfileName="aaa.txt";//客户端保存的文件名
stringfilePath=Server.MapPath("DownLoad/aaa.txt");//路径
//以字符流的形式下载文件
FileStreamfs=newFileStream(filePath,FileMode.Open);
byte[]bytes=newbyte[(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();
}