如何在Silverlight中调用JavaScript

调用示例：
首先，需要建立一个Silverlight Application ，名称为：Silverlight_JS_call.

然后要在当前的项目中加入一个类文件，名称为：EmployeeInfo.cs.

下面是相应的代码，相关内容见注释:

[ScriptableType]
public class EmployeeInfo
{
/// <summary>
/// 雇员编号
/// </summary>
[ScriptableMember]
public int EmployeeNo { get; set; }
/// <summary>
/// 雇员名称
/// </summary>
[ScriptableMember]
public string EmployeeName { get; set; }
/// <summary>
/// 地址
/// </summary>
[ScriptableMember]
public string Address { get; set; }
}
/// <summary>
/// 雇员事件参数（用于完成与js绑定事件参数）
/// </summary>
[ScriptableType]
public class EmployeeInfoEventArgs : EventArgs
{
[ScriptableMember]
public EmployeeInfo employeeInfo{ get; set; }
}

/// <summary>
/// 要注册并在页面中使用的js调用脚本对象
/// </summary>
[ScriptableType]
public class JavaScriptableObject
{
/// <summary>
/// js捆绑的事件handler
/// </summary>
[ScriptableMember]
public event EventHandler<EmployeeInfoEventArgs> SelectEmployeeInfo;

public void OnSelectEmployeeInfo(EmployeeInfo employeeinfo)
{
if (SelectEmployeeInfo != null)
{
SelectEmployeeInfo(this, new EmployeeInfoEventArgs()
{
employeeInfo = employeeinfo
});
}
}
}

/// <summary>
/// 雇员信息管理类
/// </summary>
public class EmployeeManager
{
public IEnumerable<EmployeeInfo> employeeList;
/// <summary>
/// 初始化会员数据
/// </summary>
public EmployeeManager()
{
//初始化雇员数据
employeeList = new List<EmployeeInfo>()
{
new EmployeeInfo(){EmployeeNo = 10001, EmployeeName = "张三" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10002, EmployeeName = "李四" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10003, EmployeeName = "王五" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10004, EmployeeName = "马六" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10005, EmployeeName = "王大麻子" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10006, EmployeeName = "王宝强" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10007, EmployeeName = "王蛋蛋" , Address = "北京"},
new EmployeeInfo(){EmployeeNo = 10008, EmployeeName = "王五强" , Address = "北京"}
};
}

/// <summary>
/// 获取指定数量的雇员数据
/// </summary>
/// <param name="count">要获取的雇员信息数</param>
/// <returns></returns>
public IEnumerable<EmployeeInfo> GetEmployeeList(int count)
{
return (from e in employeeList
select new EmployeeInfo
{
EmployeeNo = e.EmployeeNo,
EmployeeName = e.EmployeeName,
Address = e.Address

}).Take(count);
}
}

上面代码中要注意的是[ScriptableType]和[ScriptableMember],前者允许Silverlight把类型暴露给脚本，后者
则会把成员方法或属性暴露给脚本．
　　而下面的代码就是page.xaml中的内容：　　

<UserControl xmlns:my="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="Silverlight_JS_call.Page"
xmlns="http://schemas.microsoft.com/client/2007"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="400" Height="300">
<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="300" />
</Grid.RowDefinitions>
<my:DataGrid x:Name="EmployeeList" Grid.Row="1" AutoGenerateColumns="True" Height="280" Margin="5,5,5,5" AlternatingRowBackground="AliceBlue" RowBackground="BlanchedAlmond">
</my:DataGrid>
</Grid>
</UserControl>

　　下面则是相应的page.xaml.cs文件的内容（相关内容见注释）:　　
[ScriptableType]
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
this.Loaded += Page_Loaded;
this.EmployeeList.BeginningCellEdit +=new EventHandler<DataGridCellEditingCancelEventArgs>(EmployeeList_BeginningCellEdit);
}

void Page_Loaded(object sender, RoutedEventArgs e)
{
javaScriptableObject = new JavaScriptableObject();
//注册js可用的类型（详情见Silverlight_JS_callTestPage.aspx中的js代码）
HtmlPage.RegisterScriptableObject("EmployeeObject", javaScriptableObject);
HtmlPage.RegisterScriptableObject("Page", this);
}

/// <summary>
/// 击编辑雇员列表信息事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void EmployeeList_BeginningCellEdit(object sender, DataGridCellEditingCancelEventArgs e)
{
//当有要编辑的信息时
if (EmployeeList.SelectedItem != null)
{
EmployeeInfo employeeInfo = EmployeeList.SelectedItem as EmployeeInfo;
//执行选中信息事件操作(最终会执行js所绑定的function代码)
javaScriptableObject.OnSelectEmployeeInfo(employeeInfo);
}
}

　　//这里必须声明是public,否则js调用该方法时会报错
[ScriptableMember]
public void LoadData(int count)
{
//加载指定数据的雇员信息
EmployeeList.ItemsSource = new EmployeeManager().GetEmployeeList(count);
}

JavaScriptableObject javaScriptableObject;
}

上面代码要注意的是RegisterScriptableObject方法的调用，它用来注册可被脚本使用的对象实例，
与它相对应的还有一个方法RegisterCreateableType，它用于注册可被脚本使用的类型．
　　到这里，基本上完成的cs代码的开发工作．下面则是相应的js调用以及事件绑定代码了，请看：

<script type="text/javascript">
//显示选取的雇员信息
//注:args为cs中的EmployeeInfoEventArgs类型实例
function ShowSelectEmployeeInfo(sender, args)
{
$get("employeeNo").value = args.employeeInfo.EmployeeNo;
$get("employeeName").value = args.employeeInfo.EmployeeName;
$get("employeeAddress").value = args.employeeInfo.Address;
$get("results").style.display = 'block';
}

//初始化操作，绑定到input元素（＂加载数据＂）的click事件上,详情参见aspx文件
function Init(obj)
{
//绑定上面的js函数到silverlight的事件handler
$get("Xaml1").content.EmployeeObject.SelectEmployeeInfo = ShowSelectEmployeeInfo;

//加载雇员信息
$get("Xaml1").content.Page.LoadData(parseInt(obj.title));
}
</script>

另外在进行初始化操作，这里使用了onclick方法来执行操作，而不是直接运行相应代码．原因是
silverlight对象加载是使用了异步方式，这样会造成对象实例化完成时间迟于页面JS脚本的运行时间．
这样设计的原因，我个人认为主要是UE方面的考虑．而这时如果脚本中直接调用对象实例化的属性或
方法时，会出现对象未知的情况．

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