[SilverLight 2.0] 事件 Declaring Event Handlers

在Silverlight宣告事件的方式有兩種:

• 直接在XAML內部宣告 (優點:簡單明瞭, 缺點: 只能使用預設的參數, 不能再加參數)
• 在.cs裡面作宣告 (優點: 彈性大, 可以做變化; 缺點: 比較困難(吧~) )

第一種方式:

在XAML直接作宣告(eg. 在Page.xaml):

<Canvas Loaded=”Canvas_Loaded”>

<Button x:Name=”myButton” Content=”Hello”

Canvas.Left=”10″ Canvas.Top=”10″ />

</Canvas>

在Page.xaml.cs作處理:

private void Canvas_Loaded(object sender, RoutedEventArgs e)

{

theButton.Content = “Please Click Me”;

}

第二種方式

不需在XAML裡面宣告事件

<!– <Canvas  Loaded=”Canvas_Loaded”> –>

<Canvas >

<Button x:Name=”theButton” Content=”I’m Indented!”

Canvas.Left=”150″ Canvas.Top=”20″ />

<CheckBox x:Name=”RushOrder” Content=”Rush”

Canvas.Left=”50″ Canvas.Top=”20″ FontSize=”18″ />

</Canvas>

而是直接在Page.xaml.cs的Page( ) Constructor動手腳~

public Page()

{

InitializeComponent();

Loaded += new RoutedEventHandler(Page_Loaded);

}

void Page_Loaded(object sender, RoutedEventArgs e)

{

/*throw new NotImplementedException(); 去掉這行 */

theButton.Click +=new RoutedEventHandler(theButton_Click); //事件1

RushOrder.Checked += new RoutedEventHandler(RushOrder_Changed); //事件2

RushOrder.Unchecked +=new RoutedEventHandler(RushOrder_Change); //事件3

}

void RushOrder_Changed(object sender, RoutedEventArgs e)

{

if (RushOrder.IsChecked == true)

{

RushOrder.Content = “RUSH”;

}

else

{

RushOrder.Content = “Rush”;

}

}