asp.net下载大文件代码
public void Down(string filepath, HttpResponse aResponse) { 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; aResponse.Clear(); aResponse.Buffer = true; aResponse.Charset = "utf-8"; //Response.ContentType = "application/octet-stream"; aResponse.ContentType = "application/ms-excel"; aResponse.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlPathEncode(filename)); aResponse.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8"); // Read the bytes. while (dataToRead > 0) { // Verify that the client is connected. if (aResponse.IsClientConnected) { // Read the data in buffer. length = iStream.Read(buffer, 0, 10000); // Write the data to the current output stream. aResponse.OutputStream.Write(buffer, 0, length); // Flush the data to the HTML output. aResponse.Flush(); buffer = new Byte[10000]; dataToRead = dataToRead - length; } else { //prevent infinite loop if user disconnects dataToRead = -1; } } } catch (Exception ex) { aResponse.Write("Error : " + ex.Message); } finally { if (iStream != null) { iStream.Close(); } } }
转载于:https://www.cnblogs.com/ruanzb/archive/2010/06/30/1768278.html
public void Down(string filepath, HttpResponse aResponse)
{
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;
aResponse.Clear();
aResponse.Buffer = true;
aResponse.Charset = "utf-8";
//Response.ContentType = "application/octet-stream";
aResponse.ContentType = "application/ms-excel";
aResponse.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlPathEncode(filename));
aResponse.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (aResponse.IsClientConnected)
{
// Read the data in buffer.
length = iStream.Read(buffer, 0, 10000);
// Write the data to the current output stream.
aResponse.OutputStream.Write(buffer, 0, length);
// Flush the data to the HTML output.
aResponse.Flush();
buffer = new Byte[10000];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
catch (Exception ex)
{
aResponse.Write("Error : " + ex.Message);
}
finally
{
if (iStream != null)
{
iStream.Close();
}
}
}