Response.transmitFile()传输文件过大问题

[qianquwuyong]

我有一个.xml文件，需要用Response.transmitFile(server.mapPaht("xxx.xml"))方法把.xml文件以二进制的形式发送到http流中，在浏览器上就不会显示关于.XML文件的格式内容。请大家帮帮忙，在此谢谢了！

[wuyq11]

Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename=a.xml");
Response.TransmitFile(Server.MapPath("LabelData.xml"));
Response.End();

[wuyq11]

Response.AppendHeader("Content-Disposition", "attachment;filename=a.xml");
Response.TransmitFile(Server.MapPath("a.xml"));

[孟子E章]

下载大文件，你需要

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 = "xxx.xml";

// 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();
}
}

[孟子E章]

参见
Response.WriteFile 无法下载大文件的解决方法
http://support.microsoft.com/kb/812406/zh-cn

[一片冰心在玉壶]

上面的额够详细了，为什么不上网查查呢，直接问

[wanderpig]

[Quote=引用 4 楼 net_lover 的回复:]

下载大文件，你需要

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 dataTo……
[/Quote]

使用分块是可以下载大文件，但是你有没有想过，如果文件过大（500M），不说多了就10个人去下载这个文件，那么服务器的Cpu是否能承受？

[qianquwuyong]

谢谢各位