文件以二进制流保存到数据库及下载(转载)

文：黎承湘

为了实现此功能，查阅不少资料,发过不少求助信息,现整理出来，以供有需人士查阅.

表名： myfile; 表字段: id(int), Content(image),Type(varchar(50))

using   System;

using   System.Data;

using   System.Configuration;

using   System.Collections;

using   System.Web;

using   System.Web.Security;

using   System.Web.UI;

using   System.Web.UI.WebControls;

using   System.Web.UI.WebControls.WebParts;

using   System.Web.UI.HtmlControls;

using   System.Data.SqlClient;

using   System.IO;

public   partial   class   Image2   :   System.Web.UI.Page

{

protected   void   Page_Load(object   sender,   EventArgs   e)

{

SqlConnection   cn   =   new   SqlConnection();//数据库链接

cn.Open();

SqlDataAdapter   da2   =   new   SqlDataAdapter( "select   *   from   myfile   where   id=   24 ",   cn);//读出数据库中相应的数据

DataSet   ds2   =   new   DataSet();

da2.Fill(ds2);

byte[]   b2   =   (byte[])ds2.Tables[0].Rows[0][ "files "];

string   type   =   (string)ds2.Tables[0].Rows[0][ "type "];

Response.Clear();

string   Type   =   checktype(type);

Response.AddHeader("Content-Disposition","attachment; filename=”下载”+type);

Response.AddHeader( "Content-Length ",   b2.Length.ToString());

Response.ContentType   =   Type;

Response.BinaryWrite(b2);

Response.End();

string   FileName   =   ((LinkButton)sender).CommandArgument;

Response.Clear();

Response.ContentType   =   Type;

Response.AddHeader("Content-Disposition","attachment;FileName= "   +   HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8));

Response.WriteFile(FileName);

Response.End();

}

//根据文件的扩展名来获取对应的“输出流的HTTP MIME“类型

private   string   checktype(string   filename)

{

string   ContentType;

switch(filename.Substring(filename.LastIndexOf(". ")).Trim().ToLower())

{

case   ".asf ":

ContentType   =   "video/x-ms-asf ";

break;

case   ".avi ":

ContentType   =   "video/avi ";

break;

case   ".doc ":

ContentType   =   "application/msword ";   break;

case   ".zip ":

ContentType   =   "application/zip ";   break;

case   ".xls ":

ContentType   =  "application/vnd.ms-excel ";   break;

case   ".gif ":

ContentType   =   "image/gif ";   break;

case   ".jpg ":

ContentType   =   "image/jpeg ";   break;

case   "jpeg ":

ContentType   =   "image/jpeg ";   break;

case   ".wav ":

ContentType   =   "audio/wav ";   break;

case   ".mp3 ":

ContentType   =   "audio/mpeg3 ";   break;

case   ".mpg ":

ContentType   =   "video/mpeg ";   break;

case   ".mepg ":

ContentType   =   "video/mpeg ";   break;

case   ".rtf ":

ContentType   =   "application/rtf ";   break;

case   ".html ":

ContentType   =   "text/html ";   break;

case   ".htm ":

ContentType   =   "text/html ";   break;

case   ".txt ":

ContentType   =   "text/plain ";   break;

default:

ContentType   =   "application/octet-stream ";

break;

}

return   ContentType;

}

}

注:这是请教一个达人找到的。在网上四处找寻把音频文件上传到数据库，然后读取出来播放，一直没结果。

特放上做为记录