c# barcode generator library open source Figure 4-5. The updated Silverlight page in Font

Paint Code128 in Font Figure 4-5. The updated Silverlight page

Figure 4-5. The updated Silverlight page
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CHAPTER 4 SILVERLIGHT FORM CONTROLS
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3. Next, you need to add the event handler. Right-click the Silverlight page and select
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View Code. This will switch to the code behind of the page. From here, you will use the standard CLR language-specific syntax for adding event handlers. Since you are using C#, the syntax is to use the += operator and assign it to a new EventHandler. Visual Studio 2008 will help you with this.
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4. After the InitializeComponent() method call in the Page constructor, start typing "this.btnManaged.Click +=". At this point, Visual Studio will display the message
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new RoutedEventHandler(bntManaged_Click); (Press TAB to insert), as shown in Figure 4-6. Press Tab to complete the event handler definition.
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Figure 4-6. Visual Studio assisting with wiring up an event handler in managed code
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5. Visual Studio will once again prompt you for the name of the event handler. Go
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ahead and press Tab again to accept the default name. At this point, your source should look like this:
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namespace Ch4_EventHandlers { public partial class Page : UserControl { public Page() { InitializeComponent();
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CHAPTER 4 SILVERLIGHT FORM CONTROLS
this.btnManaged.Click += new RoutedEventHandler(btnManaged_Click); } void btnManaged_Click(object sender, RoutedEventArgs e) { throw new NotImplementedException(); } private void Button_Click(object sender, RoutedEventArgs e) { txtXAMLEventText.Text = "Thank you for clicking!"; } } } 6. Now the only thing left to do is add the code to the event handler. You will
notice that, by default, Visual Studio added code to automatically throw a NotImplementedException. Remove that line and replace it with the following line to change the TextBlock control s text.
void btnManaged_Click(object sender, RoutedEventArgs e) { txtManagedEventText.Text = "Thank you for clicking"; } 7. Run the application and click the Managed Event button. You will see the text for the second TextBlock is updated to say Thank you for clicking, as shown in Figure 4-7.
Figure 4-7. The result of the managed code event handler
CHAPTER 4 SILVERLIGHT FORM CONTROLS
This exercise demonstrated how to wire up an event handler using C# and managed code. In the remainder of the chapter, we will take a tour of the more commonly used form controls in Silverlight 2. Let s start off by looking at the Border control.
The Border Control
The Border control provides a way to add a border and background to any one control in Silverlight. Even though a border is applied to only one control, you can always place a border around a StackPanel or Grid, and as a result include many controls within a border. The syntax to add a Border control to your Silverlight project is very simple, as you can see from the following example:
<UserControl x:Class="Ch4_BorderControl.Page" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White"> <Border BorderThickness="2" BorderBrush="Black" Margin="10"> <StackPanel Margin="10"> <Button Content="Sample Button" Margin="5" /> <TextBlock Text="Sample TextBlock" Margin="5" /> <ListBox Margin="5"> <ListBoxItem> <TextBlock Text="ListItem 1" /> </ListBoxItem> <ListBoxItem> <TextBlock Text="ListItem 2" /> </ListBoxItem> <ListBoxItem> <TextBlock Text="ListItem 3" /> </ListBoxItem> <ListBoxItem> <TextBlock Text="ListItem 4" /> </ListBoxItem> </ListBox> </StackPanel> </Border> </Grid> </UserControl>
CHAPTER 4 SILVERLIGHT FORM CONTROLS
Figure 4-8 shows the results.
Figure 4-8. Using the Border control
Another feature of the Border control is the ability to round the corners of the border using the CornerRadius property. Here is how the preceding example could be modified to provide a Border control with a CornerRadius property of 10.
<Border BorderThickness="2" BorderBrush="Black" Margin="10" CornerRadius="10"> . . . </Border>
The border with rounded corners is shown in Figure 4-9. You can declare a background color for your border using the Background property. Like the BorderBrush property, the Background property can be set to either a color or a brush type. Here is an example of setting a border with a background color of silver:
<Border BorderThickness="2" BorderBrush="Black" Margin="10" CornerRadius="10" Background="Silver"> . . . </Border>
CHAPTER 4 SILVERLIGHT FORM CONTROLS
Figure 4-9. Border control with a CornerRadius property of 10
Figure 4-10 shows the result of adding the background color.
Figure 4-10. Border control with its background set to silver
CHAPTER 4 SILVERLIGHT FORM CONTROLS
The following is an example of a more complex Border control that contains a gradient for the border and background, by using a Brush object.
<Border BorderThickness="2" Margin="10" CornerRadius="10"> <Border.Background> <LinearGradientBrush> <LinearGradientBrush.GradientStops> <GradientStop Color="Green" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Border.Background> <Border.BorderBrush> <LinearGradientBrush> <LinearGradientBrush.GradientStops> <GradientStop Color="Black" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Border.BorderBrush> <StackPanel Margin="10"> <Button Content="Sample Button" Margin="5" /> <TextBlock Text="Sample TextBlock" Margin="5" /> <ListBox Margin="5"> <ListBoxItem> <TextBlock Text="ListItem 1" /> </ListBoxItem> <ListBoxItem> <TextBlock Text="ListItem 2" /> </ListBoxItem> <ListBoxItem> <TextBlock Text="ListItem 3" /> </ListBoxItem> <ListBoxItem> <TextBlock Text="ListItem 4" /> </ListBoxItem> </ListBox> </StackPanel> </Border>
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