动态加载xap

[dotkit]

我在做一个Silverlight项目的时候，想调用另外一个XAP文件里的内容，
使用的代码如下，（HomeDrid是一个Grid控件）
void HomePage_Show(object sender, RoutedEventArgs e)
{
Uri uri = new Uri("DeepZoomProject.xap", UriKind.Relative);

// 用 WebClient 下载指定的 XAP
WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(uri);
}

void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
/*
* StreamResourceInfo - 提供对通过 Silverlight 应用程序模型检索资源的支持
* AssemblyPart - 包含在 Silverlight 程序内的程序集
* AssemblyPart.Load() - 加载指定的程序集到当前应用程序域中
* Application.GetResourceStream() - 对 zip 类型的文件自动解压缩
*/

// .xap 的 AppManifest.xaml 的信息如下
/*
<Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" EntryPointAssembly="YYTetris" EntryPointType=".App" RuntimeVersion="2.0.31005.0">
<Deployment.Parts>
<AssemblyPart x:Name="" Source=".dll" />
</Deployment.Parts>
</Deployment>
*/

// 可以通过 Deployment.Current 检索 AppManifest.xaml 中的 Deployment 对象

// 取得 XAP 的 AppManifest.xaml 中的 Deployment.Parts 内的全部 AssemblyPart 节点信息
StreamResourceInfo resource = App.GetResourceStream(
new StreamResourceInfo(e.Result, null),
new Uri("AppManifest.xaml", UriKind.Relative));
string resourceManifest = new StreamReader(resource.Stream).ReadToEnd();
List<XElement> assemblyParts = XDocument.Parse(resourceManifest).Root.Elements().Elements().ToList();

Assembly assembly = null;

foreach (XElement element in assemblyParts)
{
// 取出 AssemblyPart 的 Source 指定的 dll
string source = element.Attribute("Source").Value;
AssemblyPart assemblyPart = new AssemblyPart();
StreamResourceInfo streamInfo = App.GetResourceStream(
new StreamResourceInfo(e.Result, "application/binary"),
new Uri(source, UriKind.Relative));

if (source == "DeepZoomProject.dll")
assembly = assemblyPart.Load(streamInfo.Stream);
else
assemblyPart.Load(streamInfo.Stream);
}

// 实例化 .xap 的主函数
var type = assembly.GetType("DeepZoomProject.Page");
var yyTetris = Activator.CreateInstance(type) as UIElement;

// 添加 .xap 到指定的容器内，并更新 UI
HomeGrid.Children.Add(yyTetris);
HomeGrid.UpdateLayout();
}

问题：
如果我是用Blend 或 Visual Studio 进行调试的话，能够加载且正常显示DeepZoomProject.xap里的内容，但如果我找到客户端的网页（default.html）双击直接在浏览器里打开的话，则不能正常显示， 且浏览器的状态栏提示“网页上有错误”。
请问该怎么解决？？？

[jv9]

试试这个，xaploader

public class XapLoader
{
    public event EventHandler<XapLoaderEventArgs> XapLoaded;

    private string m_rootAssembly;
    private string m_typeName;

    public void LoadXap(Uri xapUri, string typeName)
    {
        m_rootAssembly = Path.GetFileNameWithoutExtension(xapUri.ToString());
        m_typeName = typeName;

        WebClient wc = new WebClient();
        wc.OpenReadCompleted += wc_OpenReadCompleted;
        wc.OpenReadAsync(xapUri);
    }

    private void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {
        var manifestStream = Application.GetResourceStream(
            new StreamResourceInfo(e.Result, null),
            new Uri("AppManifest.xaml", UriKind.Relative));

        string appManifest = new StreamReader(manifestStream.Stream).ReadToEnd();
        string assemblyName = m_rootAssembly + ".dll";
        XmlReader reader = XmlReader.Create(new StringReader(appManifest));
        Assembly asm = null;
        while (reader.Read())
        {
            if (reader.IsStartElement("AssemblyPart"))
            {
                reader.MoveToAttribute("Source");
                reader.ReadAttributeValue();
                if (reader.Value == assemblyName)
                {
                    var assemblyStream = new StreamResourceInfo(e.Result, "application/binary");
                    var si = Application.GetResourceStream(assemblyStream, new Uri(reader.Value, UriKind.Relative));
                    AssemblyPart p = new AssemblyPart();
                    asm = p.Load(si.Stream);
                    break;
                }
            }
        }

        if (asm == null)
            throw new InvalidOperationException("Could not find specified assembly.");

        var o = asm.CreateInstance(m_typeName);
        if (o == null)
            throw new InvalidOperationException("Could not create instance of requested type.");

        RaiseXapLoadedEvent(o);
    }

    private void RaiseXapLoadedEvent(object instance)
    {
        if (XapLoaded != null)
        {
            XapLoaded(this, new XapLoaderEventArgs(instance));
        }
    }
}

public class XapLoaderEventArgs : EventArgs
{
    public object Instance { get; set; }

    public XapLoaderEventArgs(object instance)
    {
        this.Instance = instance;
    }
}

[dotkit]

[Quote=引用 3 楼 jv9 的回复:]
OK，我做个demo，随后给你。
[/Quote]
好的， 谢谢您的帮助，如果可以的话， 请发到我的邮箱[e-mail],真的十分感谢

[dotkit]

[Quote=引用 1 楼 jv9 的回复:]
试试这个，xaploader

C# codepublicclass XapLoader
{publicevent EventHandler<XapLoaderEventArgs> XapLoaded;privatestring m_rootAssembly;privatestring m_typeName;publicvoid LoadXap(Uri xapUri,string typeName)
{
m_rootAssembly= Path.GetFileNameWithoutExtension(xapUri.ToString());
m_typeName= typeName;

WebClient wc=new WebClient();
wc.OpenReadCompleted+= wc_OpenReadCompleted;
wc.OpenReadAsync(xapUri);
}privatevoid wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{var manifestStream= Application.GetResourceStream(new StreamResourceInfo(e.Result,null),new Uri("AppManifest.xaml", UriKind.Relative));string appManifest=new StreamReader(manifestStream.Stream).ReadToEnd();string assemblyName= m_rootAssembly+".dll";
XmlReader reader= XmlReader.Create(new StringReader(appManifest));
Assembly asm=null;while (reader.Read())
{if (reader.IsStartElement("AssemblyPart"))
{
reader.MoveToAttribute("Source");
reader.ReadAttributeValue();if (reader.Value== assemblyName)
{var assemblyStream=new StreamResourceInfo(e.Result,"application/binary");var si= Application.GetResourceStream(assemblyStream,new Uri(reader.Value, UriKind.Relative));
AssemblyPart p=new AssemblyPart();
asm= p.Load(si.Stream);break;
}
}
}if (asm==null)thrownew InvalidOperationException("Could not find specified assembly.");var o= asm.CreateInstance(m_typeName);if (o==null)thrownew InvalidOperationException("Could not create instance of requested type.");

RaiseXapLoadedEvent(o);
}privatevoid RaiseXapLoadedEvent(object instance)
{if (XapLoaded!=null)
{
XapLoaded(this,new XapLoaderEventArgs(instance));
}
}
}publicclass XapLoaderEventArgs : EventArgs
{publicobject Instance {get;set; }public XapLoaderEventArgs(object instance)
{this.Instance= instance;
}
}
[/Quote]
能给个Demo吗？谢谢！

[jv9]

OK，我做个demo，随后给你。

[jv9]

到这里下载吧。

http://www.silverlightchina.net/resource/XapPreloader.zip

[jv9]

网址打错了，不让编辑。。。

http://www.silverlightchina.net/resource/code/XapPreloader.zip

[abis]

已经解决了，呵呵。但在FRAME中执行还没解决，还请版主指点一下

[abis]

多谢版主，但我遇到了一个小问题，还请你指点一下，我新建了一个项目，生成的XAP包为：MyTest，但我调用的时候出错。
调用格式：
loader.LoadXap(new Uri("MyTest.xap", UriKind.Relative), "MyTest.PageMain");
出错提示为：

行: 1
错误: Unhandled Error in Silverlight 2 Application Could not create instance of requested type.   位于 XapPreloader.XapLoader.wc_OpenReadCompleted(Object sender, OpenReadCompletedEventArgs e)
   位于 System.Net.WebClient.OnOpenReadCompleted(OpenReadCompletedEventArgs e)
   位于 System.Net.WebClient.OpenReadOperationCompleted(Object arg)

还有一个小问题，我想想这个包放在我的FRAME中来执行，应该怎么做呢？

多谢了

[abis]

继续来问，呵呵