Silverligth注册JS,使用Javascript注册托管代码中的事件处理函数

Page.xaml代码

<Canvas x:Name="parentCanvas"
        xmlns="http://schemas.microsoft.com/client/2007" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        Loaded="Page_Loaded" 
        x:Class="JSInteration.Page;assembly=ClientBin/JSInteration.dll"
        Width="640"
        Height="480"
        Background="White"
        >
  <TextBlock x:Name="txt" Text ="Click Me" Canvas.Left="100" Canvas.Top="100" MouseLeftButtonDown="OnClick"></TextBlock>
</Canvas>

Page.xaml.cs代码

using System.Windows.Browser;/**////*,需要添加

namespace JSInteration
{
    [Scriptable]/**////必须添加此标签,才能在script中调用该类
    public partial class Page : Canvas
    {
        [Scriptable]/**////必须添加此标签,才能在script中添加对该事件的处理函数
        public event EventHandler TxtClicked;

        public void Page_Loaded(object o, EventArgs e)
        {
            // Required to initialize variables
            InitializeComponent();
            /**////将此对象注册到script环境,其中TxtClickApp为注册名,很关键,依赖此名称进行定位
            WebApplication.Current.RegisterScriptableObject("TxtClickApp", this);

        }
        void OnClick(object sender, MouseEventArgs e)
        {
            TextBlock tB = (TextBlock)this.FindName("txt");
            tB.FontSize += 1;

            if (TxtClicked != null)
            {
                TxtClicked(this, e);
            }           
        }
        [Scriptable]/**////必须添加此标签,才能在script中调用该方法
        public string GetFontSize() 
        {
            TextBlock tB = (TextBlock)this.FindName("txt");
            return Convert.ToInt16(tB.FontSize).ToString();
        }
    }
}

TestPage.html.js下面的注册JS代码

function createSilverlight()
{
    Silverlight.createObjectEx({
        source: "Page.xaml",
        parentElement: document.getElementById("SilverlightControlHost"),
        id: "SilverlightControl",
        properties: {
            width: "100%",
            height: "100%",
            version: "1.1",
            enableHtmlAccess: "true"
        },
        events: {
            onLoad: OnLoaded
        }
    });
       
    // Give the keyboard focus to the Silverlight control by default
    document.body.onload = function() {
      var silverlightControl = document.getElementById('SilverlightControl');
      if (silverlightControl)
      silverlightControl.focus();
    }
}
/**////XAML加载事件处理函数
function OnLoaded(sender, args)
{       
/**////使用Javascript注册托管代码中的事件处理函数,处理函数JTxtClicked为Javascript中的函数
    sender.Content.TxtClickApp.TxtClicked = JTxtClicked;
}

function JTxtClicked()
{
    /**////调用托管代码中函数获取字体大小
    var silverlightControl = document.getElementById('SilverlightControl');
    alert("Current Font Size:" + silverlightControl.Content.TxtClickApp.GetFontSize());
    
}