知识大全 ASP.NET文件下载函数使用浅析

Posted 2022-07-21 文件

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　　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 ); 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 = ; double pack = ; // K bytes //int sleep = ; //每秒次即 * K bytes每秒 int sleep = (int)Math Floor( * pack / _speed) + ; if (_Request Headers[ Range ] != null) _Response StatusCode = ; string[] range = _Request Headers[ Range ] Split(new char[] = ); startBytes = Convert ToInt (range[ ]); _Response AddHeader( Content Length (fileLength startBytes) ToString()); if (startBytes != ) //Response AddHeader( Content Range string Format( bytes / startBytes fileLength fileLength)); _Response AddHeader( Connection Keep Alive ); _Response ContentType = application/octet stream ; _Response AddHeader( Content Disposition attachment;filename= + HttpUtility UrlEncode(_fileName System Text Encoding UTF ) ); br BaseStream Seek(startBytes SeekOrigin Begin); int maxCount = (int) Math Floor((fileLength startBytes) / pack) + ; for (int i = ; 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; 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

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