在网上找的，还不错，支持很多格式。只需要在页面放个lable，建一个放视频文件的文件夹movie，加入代码：

protected void Page_Load(object sender, EventArgs e)

    {

        this.Label1.Text = Play("movie/1.wmv",500,400);

    }

    public string Play(string url, int width, int height)

    {

        string strTmp = url.ToLower();

        if (strTmp.EndsWith(".wmv") || strTmp.EndsWith(".mp3") || strTmp.EndsWith(".wma") || strTmp.EndsWith(".avi") || strTmp.EndsWith(".asf") || strTmp.EndsWith(".mpg"))

        {

            return wmv(url, width, height);

        }

        else if (strTmp.EndsWith(".mp3"))

        {

            return mp3(url, width, height);

        }

        else if (strTmp.EndsWith(".swf"))

        {

            return swf(url, width, height);

        }

        else if (strTmp.EndsWith(".jpg") || strTmp.EndsWith(".gif"))

        {

            return img(url, width, height);

        }

        else if (strTmp.EndsWith(".rm"))

        {

            return rm(url, width, height);

        }

        else if (strTmp.EndsWith(".rmvb"))

        {

            return rmvb(url, width, height);

        }

        else

        {

            return "数据错误";

        }

    }

    ///   <summary>

    ///   wmv格式文件播放

    ///   </summary>

    ///   <param   name="url"></param>

    ///   <returns></returns>   

    private string wmv(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<object   id=\"WMPlay\"   style=\"WIDTH:   " + width + "px;height:" + height + "px\"   \n");

        sb.Append("classid=\"CLSID:6BF52A52-394A-11D3-B153-00C04F79FAA6\"   type=application/x-oleobject   standby=\"Loading   Windows   Media   Player   components...\"");

        sb.Append("codebase=\"downloads/mediaplayer9.0_cn.exe\"   VIEWASTEXT>\n");

        sb.Append("<param   name=\"URL\"   value='" + url + "'>\n");

        sb.Append("<param   name=\"controls\"   value=\"ControlPanel,StatusBa\">");

        //<PARAM   NAME="CONTROLS"   VALUE="ControlPanel,StatusBar">

        sb.Append("<param   name=\"hidden\"   value=\"1\">");

        sb.Append("<param   name=\"ShowControls\"   VALUE=\"0\">");

        sb.Append("<param   name=\"rate\"   value=\"1\">\n");

        sb.Append("<param   name=\"balance\"   value=\"0\">\n");

        sb.Append("<param   name=\"currentPosition\"   value=\"-1\">\n");

        sb.Append("<param   name=\"defaultFrame\"   value=\"\">\n");

        sb.Append("<param   name=\"playCount\"   value=\"100\">\n");

        sb.Append("<param   name=\"autoStart\"   value=\"-1\">\n");

        sb.Append("<param   name=\"currentMarker\"   value=\"0\">\n");

        sb.Append("<param   name=\"invokeURLs\"   value=\"-1\">\n");

        sb.Append("<param   name=\"baseURL\"   value=\"\">\n");

        sb.Append("<param   name=\"volume\"   value=\"85\">\n");

        sb.Append("<param   name=\"mute\"   value=\"0\">\n");

        sb.Append("<param   name=\"uiMode\"   value=\"mini\">\n");

        sb.Append("<param   name=\"stretchToFit\"   value=\"0\">\n");

        sb.Append("<param   name=\"windowlessVideo\"   value=\"0\">\n");

        sb.Append("<param   name=\"enabled\"   value=\"-1\">\n");

        sb.Append("<param   name=\"enableContextMenu\"   value=\"false\">\n");

        sb.Append("<param   name=\"fullScreen\"   value=\"0\">\n");

        sb.Append("<param   name=\"SAMIStyle\"   value=\"\">\n");

        sb.Append("<param   name=\"SAMILang\"   value=\"\">\n");

        sb.Append("<param   name=\"SAMIFilename\"   value=\"\">\n");

        sb.Append("<param   name=\"captioningID\"   value=\"\">\n");

        sb.Append("</object><br>\n");

        return sb.ToString();

    }

    private string rmvb(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<OBJECT height='" + height + "' width='" + width + "' classid=clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA>");

        sb.Append("<PARAM NAME=\"_ExtentX\" VALUE='12700'>");

        sb.Append("<PARAM NAME=\"_ExtentY\" VALUE='9525'>");

        sb.Append("<PARAM NAME=\"AUTOSTART\" VALUE='-1'>");

        sb.Append("<PARAM NAME=\"SHUFFLE\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"PREFETCH\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"NOLABELS\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"SRC\" VALUE='" + url + "'>");

        sb.Append("<PARAM NAME=\"CONTROLS\" VALUE='ImageWindow'>");

        sb.Append("<PARAM NAME=\"CONSOLE\" VALUE='Clip'>");

        sb.Append("<PARAM NAME=\"LOOP\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"NUMLOOP\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"CENTER\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"MAINTAINASPECT\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"BACKGROUNDCOLOR\" VALUE='#000000'>");

        sb.Append("</OBJECT>");

        sb.Append("<BR>");

        sb.Append("<OBJECT height=32 width='" + width + "' classid=clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA>");

        sb.Append("<PARAM NAME=\"_ExtentX\" VALUE='12700'>");

        sb.Append("<PARAM NAME=\"_ExtentY\" VALUE='847'>");

        sb.Append("<PARAM NAME=\"AUTOSTART\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"SHUFFLE\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"PREFETCH\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"NOLABELS\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"CONTROLS\" VALUE='ControlPanel,StatusBar'>");

        sb.Append("<PARAM NAME=\"CONSOLE\" VALUE='Clip'>");

        sb.Append("<PARAM NAME=\"LOOP\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"NUMLOOP\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"CENTER\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"MAINTAINASPECT\" VALUE='0'>");

        sb.Append("<PARAM NAME=\"BACKGROUNDCOLOR\" VALUE='#000000'>");

        sb.Append("</OBJECT>");

        return sb.ToString();

    }

    private string wma(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<object   id=\"WMPlay\"   classid=\"clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95\"   style=\"Z-INDEX:   101;   LEFT:   40px;   WIDTH:   240px;   POSITION:   absolute;   TOP:   32px;   HEIGHT:   248px\"   >");

        sb.Append("<param   name=\"Filename\"   value=\"" + url + "\">");

        sb.Append("<param   name=\"PlayCount\"   value=\"1\">");

        sb.Append("<param   name=\"AutoStart\"   value=\"0\">");

        sb.Append("<param   name=\"ClickToPlay\"   value=\"1\">");

        //sb.Append("<param   name=\"DisplaySize\"   value=\"0\">");

        sb.Append("<param   name=\"EnableFullScreen   Controls\"   value=\"1\">");

        sb.Append("<param   name=\"ShowAudio   Controls\"   value=\"1\">");

        sb.Append("<param   name=\"EnableContext   Menu\"   value=\"1\">");

        sb.Append("<param   name=\"ShowDisplay\"   value=\"1\">");

        sb.Append("</object>");

        return sb.ToString();

    }

    ///   <summary>

    ///   avi格式文件播放

    ///   </summary>

    ///   <param   name="url"></param>

    ///   <returns></returns>

    private string avi(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<object   id=\"WMPlay\"   width=\"400\"   height=\"200\"   border=\"0\"   classid=\"clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA\">");

        sb.Append("<param   name=\"ShowDisplay\"   value=\"0\">");

        sb.Append("<param   name=\"ShowControls\"   value=\"1\">");

        sb.Append("<param   name=\"AutoStart\"   value=\"1\">");

        sb.Append("<param   name=\"AutoRewind\"   value=\"0\">");

        sb.Append("<param   name=\"PlayCount\"   value=\"0\">");

        sb.Append("<param   name=\"Appearance   value=\"0   value=\"\"\">");

        sb.Append("<param   name=\"BorderStyle   value=\"0   value=\"\"\">");

        sb.Append("<param   name=\"MovieWindowHeight\"   value=\"240\">");

        sb.Append("<param   name=\"MovieWindowWidth\"   value=\"320\">");

        sb.Append("<param   name=\"FileName\"   value=\"" + url + "\">");

        sb.Append("</object>");

        return sb.ToString();

    }

    private string mpg(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<object   classid=\"clsid:05589FA1-C356-11CE-BF01-00AA0055595A\"   id=\"WMPlay\"   width=\"239\"   height=\"250\">");

        sb.Append("<param   name=\"Filename\"   value=\"" + url + "\"   valuetype=\"ref\">");

        sb.Append("<param   name=\"Appearance\"   value=\"0\">");

        sb.Append("<param   name=\"AutoStart\"   value=\"-1\">");

        sb.Append("<param   name=\"AllowChangeDisplayMode\"   value=\"-1\">");

        sb.Append("<param   name=\"AllowHideDisplay\"   value=\"0\">");

        sb.Append("<param   name=\"AllowHideControls\"   value=\"-1\">");

        sb.Append("<param   name=\"AutoRewind\"   value=\"-1\">");

        sb.Append("<param   name=\"Balance\"   value=\"0\">");

        sb.Append("<param   name=\"CurrentPosition\"   value=\"0\">");

        sb.Append("<param   name=\"DisplayBackColor\"   value=\"0\">");

        sb.Append("<param   name=\"DisplayForeColor\"   value=\"16777215\">");

        sb.Append("<param   name=\"DisplayMode\"   value=\"0\">");

        sb.Append("<param   name=\"Enabled\"   value=\"-1\">");

        sb.Append("<param   name=\"EnableContextMenu\"   value=\"-1\">");

        sb.Append("<param   name=\"EnablePositionControls\"   value=\"-1\">");

        sb.Append("<param   name=\"EnableSelectionControls\"   value=\"0\">");

        sb.Append("<param   name=\"EnableTracker\"   value=\"-1\">");

        sb.Append("<param   name=\"FullScreenMode\"   value=\"0\">");

        sb.Append("<param   name=\"MovieWindowSize\"   value=\"0\">");

        sb.Append("<param   name=\"PlayCount\"   value=\"1\">");

        sb.Append("<param   name=\"Rate\"   value=\"1\">");

        sb.Append("<param   name=\"SelectionStart\"   value=\"-1\">");

        sb.Append("<param   name=\"SelectionEnd\"   value=\"-1\">");

        sb.Append("<param   name=\"ShowControls\"   value=\"-1\">");

        sb.Append("<param   name=\"ShowDisplay\"   value=\"-1\">");

        sb.Append("<param   name=\"ShowPositionControls\"   value=\"0\">");

        sb.Append("<param   name=\"ShowTracker\"   value=\"-1\">");

        sb.Append("<param   name=\"Volume\"   value=\"-480\">");

        sb.Append("</object>");

        return sb.ToString();

    }

    private string rm(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<OBJECT   ID=\"WMPlay\"   codebase=\"downloads/RealPlayer10-5GOLD_cn0302.exe\"   CLASSID=\"clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA\"   HEIGHT=" + height + "   WIDTH=" + width + ">");

        sb.Append("<param   name=\"SRC\"   value=\"" + url + "\">");

        //sb.Append("<param   name=\"_ExtentX\"   value=\"9313\">");

        //sb.Append("<param   name=\"_ExtentY\"   value=\"7620\">");

        sb.Append("<param   name=\"AUTOSTART\"   value=\"0\">");

        sb.Append("<param   name=\"SHUFFLE\"   value=\"0\">");

        sb.Append("<param   name=\"PREFETCH\"   value=\"0\">");

        sb.Append("<param   name=\"NOLABELS\"   value=\"0\">");

        sb.Append("<param   name=\"CONTROLS\"   value=\"ImageWindow,ControlPanel,statusbar\">");

        sb.Append("<param   name=\"CONSOLE\"   value=\"Clip1\">");

        sb.Append("<param   name=\"LOOP\"   value=\"0\">");

        sb.Append("<param   name=\"NUMLOOP\"   value=\"0\">");

        sb.Append("<param   name=\"CENTER\"   value=\"0\">");

        sb.Append("<param   name=\"MAINTAINASPECT\"   value=\"0\">");

        sb.Append("<param   name=\"BACKGROUNDCOLOR\"   value=\"#000000\">");

        //sb.Append("<embed   SRC   type=\"audio/x-pn-realaudio-plugin\"   CONSOLE=\"Clip1\"   CONTROLS=\"ImageWindow\"   HEIGHT=\"250\"   WIDTH=\"354\"   AUTOSTART=\"false\">");

        sb.Append("</OBJECT>");

        return sb.ToString();

    }

    private string swf(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<OBJECT   codeBase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0\"   ");

        sb.Append("   height=\"" + height + "\"   width=\"" + width + "\"   >");

        sb.Append("<PARAM   NAME=\"FlashVars\"   VALUE=\"\">");

        sb.Append("<PARAM   NAME=\"Movie\"   VALUE=\"" + url + "\">");

        sb.Append("<PARAM   NAME=\"Src\"   VALUE=\"" + url + "\">");

        sb.Append("<PARAM   NAME=\"WMode\"   VALUE=\"Window\">");

        sb.Append("<PARAM   NAME=\"Play\"   VALUE=\"-1\">");

        sb.Append("<PARAM   NAME=\"Loop\"   VALUE=\"-1\">");

        sb.Append("<PARAM   NAME=\"Quality\"   VALUE=\"High\">");

        sb.Append("<PARAM   NAME=\"SAlign\"   VALUE=\"\">");

        sb.Append("<PARAM   NAME=\"Menu\"   VALUE=\"0\">");

        sb.Append("<PARAM   NAME=\"Base\"   VALUE=\"\">");

        sb.Append("<PARAM   NAME=\"AllowScriptAccess\"   VALUE=\"always\">");

        sb.Append("<PARAM   NAME=\"Scale\"   VALUE=\"ShowAll\">");

        sb.Append("<PARAM   NAME=\"DeviceFont\"   VALUE=\"0\">");

        sb.Append("<PARAM   NAME=\"EmbedMovie\"   VALUE=\"0\">");

        sb.Append("<PARAM   NAME=\"BGColor\"   VALUE=\"\">");

        sb.Append("<PARAM   NAME=\"SWRemote\"   VALUE=\"\">");

        sb.Append("<PARAM   NAME=\"MovieData\"   VALUE=\"\">");

        sb.Append("<PARAM   NAME=\"SeamlessTabbing\"   VALUE=\"1\">");

        sb.Append("<embed   src=\"" + url + "\"   height=\"" + height + "\"   width=\"" + width + "\"   quality=\"high\"   pluginspage=\"http://www.macromedia.com/go/getflashplayer\"type=\"application/x-shockwave-flash\"   menu=\"false\">"); sb.Append("</embed>");

        sb.Append("</OBJECT>");

        return sb.ToString();

    }

    private string mp3(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<object   classid=\"WMPlay\"   codebase=\"http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=6,4,5,715\"   type=\"application/x-oleobject\"   width=\"   +   width   +   \"   height=\"   +   height   +   \"   hspace=\"0\"   standby=\"Loading   Microsoft   Windows   Media   Player   components...\"   id=\"NSPlay\">");

        sb.Append("<param   name=\"AutoRewind\"   value=\"0\">");

        sb.Append("<param   name=\"FileName\"   value=\"   +   url   +   \">");

        sb.Append("<param   name=\"ShowControls\"   value=\"1\">");

        sb.Append("<param   name=\"ShowPositionControls\"   value=\"0\">");

        sb.Append("<param   name=\"ShowAudioControls\"   value=\"1\">");

        sb.Append("<param   name=\"ShowTracker\"   value=\"0\">");

        sb.Append("<param   name=\"ShowDisplay\"   value=\"0\">");

        sb.Append("<param   name=\"ShowStatusBar\"   value=\"1\">");

        sb.Append("<param   name=\"ShowGotoBar\"   value=\"0\">");

        sb.Append("<param   name=\"ShowCaptioning\"   value=\"0\">");

        sb.Append("<param   name=\"AutoStart\"   value=\"1\">");

        sb.Append("<param   name=\"Volume\"   value=\"-2500\">");

        sb.Append("<param   name=\"AnimationAtStart\"   value=\"0\">");

        sb.Append("<param   name=\"TransparentAtStart\"   value=\"0\">");

        sb.Append("<param   name=\"AllowChangeDisplaySize\"   value=\"0\">");

        sb.Append("<param   name=\"AllowScan\"   value=\"0\">");

        sb.Append("<param   name=\"EnableContextMenu\"   value=\"0\">");

        sb.Append("<param   name=\"ClickToPlay\"   value=\"0\">");

        sb.Append("</object>");

        return sb.ToString();

    }

    private string img(string url, int width, int height)

    {

        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        sb.Append("<img   src=\"" + url + "\"   height=\"" + height + "\"   width=\"" + width + "\"   border=\"0\">");

        return sb.ToString();

    }

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