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Silverlight:分包下载及SEO优化方案

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前端工具

一、按模块分包

一般大型的Silverlight应用,都会按模块分解成多个silverlight project,编译后就有多个xap包,然后在需要用到的场景按需加载。我近期开发的这个项目不需要全站Silverlight,而是aspx混合silverlight,说得更白点,就是把相应的子模块xap包嵌入aspx.


这样分包就简单多了:直接用js控制dom元素,修改object元素中的source,动态设置成不同的xap即可实现无刷新的加载不同模块。(这比网上主流的方式:用WebClient动态下载xap包,最终再反射加载,个人觉得更简单。当然,这种方式不适用于整站Silverlight的项目)

二、按需反射加载xap中的页面

上面讨论的办法,只是解决了按需加载不同的xap文件,但是如果一个xap中有多个页面,如何确定加载某个xap后,显示其中的哪个页面呢?


答案:参数传入+反射


silvelright以object标签嵌入html时,可以指定一些传入参数,类似下面这样:

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<object data="data:application/x-silverlight-2," type="application/x-silverlight-2"
            width="100%" height="100%">
            <param name="source" value="ClientBin/Basic.xap" />
            <param name="onError" value="onSilverlightError" />
            <param name="background" value="white" />
            <param name="minRuntimeVersion" value="4.0.50826.0" />
            <param name="autoUpgrade" value="true" />
            <param name="initParams" value="page=Basic.City" />
            <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0.50826.0" style="text-decoration: none">
                <img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://go.microsoft.com/fwlink/?LinkId=161376" alt="Get Microsoft Silverlight"
                    style="border-style: none" />
            </a>
        </object>

注意其中的<param name="initParams" value="page=Basic.City"/>这表明我们想让City页面在加载成功后显示。

那么,SL中如何接受这个参数呢?看下面的代码:

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private void Application_Startup(object sender, StartupEventArgs e)
{
    //检测有无传入参数
    if (e.InitParams != null && e.InitParams.ContainsKey("page"))
    {
        string _pageName = e.InitParams["page"];
        //根据page参数,动态反射加载相应的实例
        Assembly asm = this.GetType().Assembly;
        UserControl _page = asm.CreateInstance(_pageName) as UserControl;
        this.RootVisual  = _page;
    }
    else
    {
        //如果没有参数传入,则显示默认页面
        this.RootVisual = new Airport();
    }
}

三、SEO优化

这是RIA应用经常会遇到的一个问题,前面提到的处理方法并未涉及这一块,默认情况下:xap模块的动态加载,以及根据参数动态反射加载不同页面,都不会改变浏览器的地址,所以搜索引擎会始终认为这是一个页面,最终也只能收录一个网址。


为了对搜索引擎更友好,可以在地址栏的#部分做些手脚,最终要到达的效果:


如果动态加载Basic.xap模块,且显示该模块中的City页面时,我们可以让地址栏类似: http://localhost:1223/Default.aspx#Basic|Basic.City

切换到User.xap模块(即用户管理模块),且显示该模块中的User页面时,我们可以让地址栏类似:http://localhost:1223/Default.aspx#User|User.User

这样,虽然都是同一个default.aspx页面,但是搜索引擎却认为这是二个不同的url,会搜录二个地址。


default.aspx完整代码如下:

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<%@ Page Language="c#" AutoEventWireup="true" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Silverlight SEO优化及分包下载</title>
    <style type="text/css">
        html, body
        {
            height: 100%;
            overflow: auto;
            font-size:12px;
        }
        body
        {
            padding: 0;
            margin: 0;
        }
        #silverlightControlHost
        {
            height: 100%;
            text-align: center;
        }
        #nav
        {
            line-height:30px;
            text-align: center;
            background: #efefef;
            padding: 5px;
        }
        #nav a
        {
            padding: 0px 10px;
             
        }
    </style>
    <script type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="Silverlight.js"></script>
    <script type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="jquery-1.6.4.min.js"></script>
    <script type="text/javascript">
        function onSilverlightError(sender, args) {
            var appSource = "";
            if (sender != null && sender != 0) {
                appSource = sender.getHost().Source;
            }
 
            var errorType = args.ErrorType;
            var iErrorCode = args.ErrorCode;
 
            if (errorType == "ImageError" || errorType == "MediaError") {
                return;
            }
 
            var errMsg = "Unhandled Error in Silverlight Application " + appSource + "\n";
 
            errMsg += "Code: " + iErrorCode + "    \n";
            errMsg += "Category: " + errorType + "       \n";
            errMsg += "Message: " + args.ErrorMessage + "     \n";
 
            if (errorType == "ParserError") {
                errMsg += "File: " + args.xamlFile + "     \n";
                errMsg += "Line: " + args.lineNumber + "     \n";
                errMsg += "Position: " + args.charPosition + "     \n";
            }
            else if (errorType == "RuntimeError") {
                if (args.lineNumber != 0) {
                    errMsg += "Line: " + args.lineNumber + "     \n";
                    errMsg += "Position: " + args.charPosition + "     \n";
                }
                errMsg += "MethodName: " + args.methodName + "     \n";
            }
 
            throw new Error(errMsg);
        }
 
 
        //加载Silverlight
        function loadSilverlight(url) {
            if (url.indexOf("#") == -1) {return;}
            var _param = url.split('#')[1];          
            var _sl = document.getElementById("sl");
            var _xap = _param.split('|')[0] + ".xap";
            var _page = _param.split('|')[1];           
            _sl.innerHTML = "<object data='data:application/x-silverlight-2,' type='application/x-silverlight-2' width='100%' height='100%'><param name='source' value='ClientBin/" + _xap + "' /><param name='onError' value='onSilverlightError' /><param name='background' value='white' /><param name='minRuntimeVersion' value='4.0.50826.0' /><param name='autoUpgrade' value='true' /><param name='initParams' value='page=" + _page + "' /><a href='http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0.50826.0' style='text-decoration: none'><img src='http://go.microsoft.com/fwlink/?LinkId=161376' alt='Get Microsoft Silverlight' style='border-style: none' /></a></object>";
        }
 
 
        $().ready(function () {           
            loadSilverlight(window.location.href);
        })
    </script>
</head>
<body>
    <form id="form1" runat="server" style="height: 100%">
    <div id="silverlightControlHost">
        <div id="nav">
        Silvelight分包以及SEO示例 (by 菩提树下的杨过 http://yjmyzz.cnblogs.com/):<br/>
            <a href="#Basic|Basic.City" onclick="loadSilverlight(this.href)">城市管理</a> | <a href="#Basic|Basic.Airport" onclick="loadSilverlight(this.href)">航站管理</a> |
            <a href="#User|User.User" onclick="loadSilverlight(this.href)">用户管理</a> | <a href="#User|User.Organization" onclick="loadSilverlight(this.href)">组织机构管理</a>
        </div>
        <div id="sl">
        <object data="data:application/x-silverlight-2," type="application/x-silverlight-2"
            width="100%" height="100%">
            <param name="source" value="ClientBin/Basic.xap" />
            <param name="onError" value="onSilverlightError" />
            <param name="background" value="white" />
            <param name="minRuntimeVersion" value="4.0.50826.0" />
            <param name="autoUpgrade" value="true" />
            <param name="initParams" value="page=Basic.City" />
            <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0.50826.0" style="text-decoration: none">
                <img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://go.microsoft.com/fwlink/?LinkId=161376" alt="Get Microsoft Silverlight"
                    style="border-style: none" />
            </a>
        </object>
        </div>
        <iframe id="_sl_historyFrame" style="visibility: hidden; height: 0px; width: 0px;
            border: 0px"></iframe>
    </div>
    </form>
</body>
</html>
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