ASP.NET文件下载函数使用浅析 【转】2009-08-06 20:31
ASP.NET文件下载函数使用是什么情况呢？在你的Page_Load中添加这样的代码:

Page.Response.Clear(); 
bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称", "源文件路径", 1024000); 
if (!success) Response.Write("下载文件出错！"); Page.Response.End(); 
ASP.NET文件下载函数代码为:

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; 
} 

其中：

"目的文件名称" 可以是："a.txt"

"源文件路径"可以是：@"C:\a.txt"

sleep可以是500


这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.


转自：http://dotnet.csdn.net/page/f1c3ea27-4dac-4742-a9a2-d4c6730b9dea
 

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------解决方案--------------------
让客户设置  浏览器不打开

------解决方案--------------------
string url_str = "~/projectName/MyTest.txt";
Response.Redirect(url_str);

------解决方案--------------------
        /// <summary>
       /// 获取物理地址
       /// </summary>
       public static string MapPathFile(string FileName)
       {
           return HttpContext.Current.Server.MapPath(FileName);
       }

       /// <summary>
       /// 普通下载
       /// </summary>
       /// <param name="FileName">文件虚拟路径</param>
       public static void DownLoadold(string FileName)
       {
           string destFileName = MapPathFile(FileName);
           if (File.Exists(destFileName))
           {
               FileInfo fi = new FileInfo(destFileName);