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转自 http://5543541.qzone.qq.com/blog/23
System.IO.Stream iStream = null;
byte[] buffer = new Byte[10240]; int length; long dataToRead; string filepath = "文件存放地址"; string filename = System.IO.Path.GetFileName(filepath); iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read,System.IO.FileShare.Read); Response.Clear(); dataToRead = iStream.Length; long p = 0; if(Request.Headers["Range"]!=null) { Response.StatusCode = 206; p = long.Parse( Request.Headers["Range"].Replace("bytes=","").Replace("-","")); } if(p != 0) { Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString()); } Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString()); Response.ContentType = "application/octet-stream"; Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode("真实文件名")); iStream.Position = p; dataToRead = dataToRead - p; while (dataToRead > 0) { if (Response.IsClientConnected) { length = iStream.Read(buffer, 0, 10240); Response.OutputStream.Write(buffer, 0, length); Response.Flush(); buffer= new Byte[10240]; dataToRead = dataToRead - length; } else { dataToRead = -1; } } iStream.Close(); Response.End(); |
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