asp.net中大文件下载

因为IIS支持的最大文件为int32的最大值位数的文件下载，所以，超过2G的文件无法通过IIS进行下载。

通过网上查找的资料，如下可实现文件的下载，使用filestream进行下载。

        public void download(){System.IO.Stream iStream = null;byte[] buffer = new Byte[10000];//设置大小int length;long dataToRead;string filepath = Server.MapPath("~/Upload/XXX/YYY.rar");//文件的路径string filename = System.IO.Path.GetFileName(filepath);try{iStream = new System.IO.FileStream(filepath, FileMode.Open, FileAccess.Read);dataToRead = iStream.Length;Response.Clear();Response.ClearHeaders();Response.ClearContent();Response.ContentType = "application/unknow"; Response.AddHeader("Content-Length", dataToRead.ToString());Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);while (dataToRead > 0){if (Response.IsClientConnected){length = iStream.Read(buffer, 0, 10000);Response.OutputStream.Write(buffer, 0, length);Response.Flush();buffer = new Byte[10000];dataToRead = dataToRead - length;}else{dataToRead = -1;}}}catch (Exception ex){Response.Write("Error : " + ex.Message);}finally{if (iStream != null){iStream.Close();}Response.End();}}