复制代码 代码如下:

public void FileDownLoadDel(string fullFilename)

{

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 = fullFilename;

filepath = Server.MapPath(filepath);

// 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;

Response.Clear();

}

}

Response.End(); //没有这句会将该页面刷新后的内容追加写入文件中。

}

catch (Exception ex)

{

// Trap the error, if any.

//Response.Write("Error : " + ex.Message);

//base.WriteLog("资料", "下载资料:" + ex.Message + "!", LogType.Error, this.GetType().ToString());

}

finally

{

if (iStream != null)

{

//Close the file.

iStream.Close();

}

File.Delete(fullFilename);

}

}