ASP.NET文件下載函數使用淺析

 

引入命名空間
using System.IO;
using System.Threading;

ASP.NET文件下載函數使用是什麼情況呢？在你的Page_Load中添加這樣的代碼:

Page.Response.Clear();
bool success = ResponseFile(Page.Request, Page.Response, "目的文件名稱", @"源文件路徑", 1024000); //Server.MapPath("源文件路徑")
if (!success) Response.Write("下載文件出錯！"); Page.Response.End();
ASP.NET文件下載函數代碼爲:

public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed) {
try
{
FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
BinaryReader br = new BinaryReader(myFile);
try
{
_Response.AddHeader("Accept-Ranges", "bytes"
);
_Response.Buffer = false;
long fileLength = myFile.Length;
long startBytes = 0; double pack = 10240;
//10K bytes
int sleep = 200;
//每秒5次 即5*10K bytes每秒 int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
if (_Request.Headers["Range"] != null)
{
_Response.StatusCode = 206;
string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});
startBytes = Convert.ToInt64(range[1]);
}
_Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
if (startBytes != 0) {
//Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));
}
_Response.AddHeader("Connection", "Keep-Alive");
_Response.ContentType = "application/octet-stream";
_Response.AddHeader("Content-Disposition","attachment; filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) ); br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;
for (int i = 0; i < maxCount; i++) { if (_Response.IsClientConnected) { _Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString()))); Thread.Sleep(sleep);
} else { i=maxCount;
}
} }
catch
{
return false;
}
finally
{
br.Close();
myFile.Close();
}
}
catch
{
return false;
}
return true;
}
這樣就實現了文件下載時,不管是什麼格式的文件,都能夠彈出打開/保存窗口.

ASP.NET 文件下載函數的基本情況就向你介紹到這裏，希望對你瞭解ASP.NET文件下載函數有所幫助。