c#实现大文件分块发送到客户端

system.io.stream istream = null;

// buffer to read 10k bytes in chunk:
byte[] buffer = new byte[10000];

// length of the file:
int length;

// total bytes to read:
long datatoread;

// identify the file to download including its path.
string filepath = "downloadfilename";

// identify the file name.
string filename = system.io.path.getfilename(filepath);

try
{
// open the file.
istream = new system.io.filestream(filepath, system.io.filemode.open,
system.io.fileaccess.read,system.io.fileshare.read);

// total bytes to read:
datatoread = istream.length;

response.contenttype = "application/octet-stream";
response.addheader("content-disposition", "attachment; filename=" + filename);

// read the bytes.
    while (datatoread > 0)
{
   // verify that the client is connected.
   if (response.isclientconnected)
   {
    // read the data in buffer.
    length = istream.read(buffer, 0, 10000);

// write the data to the current output stream.
response.outputstream.write(buffer, 0, length);

// flush the data to the html output.
response.flush();

    buffer= new byte[10000];
    datatoread = datatoread - length;
   }
   else
   {
    //prevent infinite loop if user disconnects
    datatoread = -1;
   }
}
}
catch (exception ex)
{
// trap the error, if any.
response.write("error : " + ex.message);
}
finally
{
if (istream != null)
{
   //close the file.
   istream.close();
}
}

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c#实现大文件分块发送到客户端

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