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Wiring up event handlers in Silverlight

From: Silverlight 5 Essential Training

Video: Wiring up event handlers in Silverlight

In this movie, I will show you how to subscribe to an event in Silverlight. I'm inside Visual Studio and I've opened a project called WiringUpEventHandlers. I'm going to start by looking inside the InXaml.xaml file. For this first demo, I'm going to show you how to do XAML-only wire up of event handlers. I'm going to start by adding an event procedure to this button. This button does not have a name and that will be significant when I enter my event handler. I'm going to use the click event handler, so I'll come here and I'll type in the word click.

Wiring up event handlers in Silverlight

In this movie, I will show you how to subscribe to an event in Silverlight. I'm inside Visual Studio and I've opened a project called WiringUpEventHandlers. I'm going to start by looking inside the InXaml.xaml file. For this first demo, I'm going to show you how to do XAML-only wire up of event handlers. I'm going to start by adding an event procedure to this button. This button does not have a name and that will be significant when I enter my event handler. I'm going to use the click event handler, so I'll come here and I'll type in the word click.

If you look at the IntelliSense, you'll see that there's a lightning bullet on the left-hand side. That lightning bullet signifies that this is an event member of the Button class. I'm going to press Tab to finish typing the word click and Visual Studio says, would you like a new event handler? I can press Tab a second time to stub in the code. Name of my event handler is Button_Click. But it doesn't work too well when you have more than one button, it's better if you name your button. My second button has a name.

It's called LiveButton. Let's go through those same steps. Click, Tab, I'm going to choose the first option here New Event Handler. Now, when Visual Studio stubs in the code it uses the name of my element to generate the name of the function. So, now it's called LiveButton_Click. There are hundreds of events available in Silverlight. I thought I would show you an event for the Ellipse shape. Let's scroll down to the Ellipse and I'll type in mou and we'd look at some of the mouse events here.

I've got MouseEnter and MouseLeave and MouseLeftButtonUp is the one I'm interested in. Now, I'm going to press Tab two times, and again it stubs in the code. I do have to write some code in these event handlers. To do that I'm going to press the F7 key to switch to my code behind and over here you can see that Visual Studio has stubbed in three different event procedures. The first one is Button_Click, the second one is LiveButton_Click, and of course, here's my Mouse event handler. They look similar; however, if you look closely at the MouseLeftButtonUp, you'll see that the second argument is MouseButtonEventArgs where it is RoutedEventArgs in the other two event handlers.

You'll learn more about that later. I'll write a little bit of code here. resultTextBlock.text. This is a UI element that I'm going to output some text into, equal (=) and then the name of my control, a close one Button 1. I'll Copy this code and paste it in my other two procedures and then change the strings, and now I'm ready to test my application.

What should happen is when I click on the buttons I want a mouseup on the shape; I should see some text output to my UI. I'll press F5 to run the application. Click on the first button, see this successful output; the second button. And now I'm going to click on the ellipse. I'm clicking on the ellipse but I haven't let go off the mouse button yet. It's not until I let go, right now, that you see the text output happen. Returning back to Visual Studio, there is another way to add an event procedure to your XAML, that is, with the Property window.

I'll scroll down, select my Ellipse, switchover to the Property window, and click on the Events tab. These are all the events that are available for the ellipse, and as I scroll down the list, you'll see at the MouseLeftButtonUp level, the name of the function that was already created for me. If I want to add another event, there're two ways I can do that. I can double-click, say here in MouseMove, and Visual Studio again will stub in some code on my behalf; or I can come over here, let's go the MouseWheel, and I can type in the name of a function. ABC_Wheel.

Now, rather than relying on Microsoft's naming conventions, I'm choosing the name of the function that I want. And I'm going to press Enter and again you see it stubs it in, but this time with my name. Next, I'm going to show you how to how to wire up event handlers in code behind. So, I'm going to switchover to this XAML file, which has a very similar UI to the one I just showed you. Then I'm going to switch to code behind. This is one way to wire up an event handler in code. This is my shape; this is the event that's going to be raised in the shape.

I then use the C#+= syntax to signify that I'm registering an event handler and then I use the name of the function. Of course, I have to have that function somewhere in my code. Here it is and this function has to have the correct signature. By that I mean, it has a return of void; and have two arguments, the first argument being an object, and the second argument being MouseButtonEventArgs. The more verbose way of wiring up the event handler is shown on this line. It starts off the same but after the += symbol, it says new MouseButtonEventHandler and then in parentheses it has the name of the function.

This is the more verbose syntax. What this is signifying is that I'm initiating an instance of the delegate that's going to communicate between my code and the object raising the event. For my third example, I'm going to show you how to do it using their RoutedEvent syntax. RoutedEvents are actually managed by the dependency system, so this is the official way to add a handler in the dependency system way. I'll use the AddHandler function name and then a couple of arguments are important here; the name of the event and the function that I'm going to call.

What I would you to take away from this movie is that there are two ways to wire up your event handlers. You can do it in your XAML file or in your code behind file, plus Visual Studio provides tools to help you write the code.

Show transcript

This video is part of

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Silverlight 5 Essential Training

106 video lessons · 5452 viewers

Walt Ritscher
Author

 
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  1. 1m 41s
    1. Welcome
      53s
    2. Using the exercise files
      48s
  2. 35m 0s
    1. Overview of Silverlight
      3m 29s
    2. Setting up a developer computer
      2m 46s
    3. Installing the Silverlight Toolkit
      2m 21s
    4. Exploring the toolkit samples
      2m 35s
    5. Using Visual Studio 2010 to create a Silverlight project
      5m 10s
    6. Using Expression Blend to create a Silverlight project
      3m 13s
    7. Getting to know the Visual Studio interface
      8m 15s
    8. Working in the Expression Blend interface
      7m 11s
  3. 29m 46s
    1. Understanding the Visual Studio project structure
      3m 38s
    2. Creating a Silverlight page
      3m 17s
    3. Compiling your first application
      5m 0s
    4. Using other assemblies in an application
      5m 45s
    5. Deploying a Silverlight application
      3m 43s
    6. Understanding the startup process for an application
      3m 13s
    7. Understanding how users get Silverlight on their computers
      5m 10s
  4. 16m 59s
    1. Exploring the relationship between XAML and .NET
      3m 57s
    2. Using C#
      7m 16s
    3. Exploring the code-behind file
      5m 46s
  5. 43m 22s
    1. Working with XAML elements and Property attributes
      4m 56s
    2. Investigating XAML namespaces
      7m 31s
    3. Converting XAML properties with TypeConverters
      5m 1s
    4. Working with Property elements
      4m 24s
    5. Assigning runtime data with XAML markup extensions
      4m 21s
    6. Digging into the dependency property system
      6m 12s
    7. Creating a custom dependency property
      4m 42s
    8. Understanding attached properties
      6m 15s
  6. 9m 35s
    1. Debugging your code
      5m 17s
    2. Special Silverlight debugging techniques
      4m 18s
  7. 36m 0s
    1. Understanding layout
      4m 55s
    2. Using DockPanel and WrapPanel
      4m 2s
    3. Exploring sophisticated layouts with the Grid
      6m 40s
    4. Absolute positioning with the Canvas panel
      5m 20s
    5. Scrolling content with the ScrollViewer
      3m 28s
    6. Adjusting content alignment, margins, and sizing
      5m 6s
    7. Using the TabControl
      2m 17s
    8. Manipulating elements with transforms
      4m 12s
  8. 20m 32s
    1. Painting the user interface (UI) with SolidColorBrush
      6m 7s
    2. Getting colorful with gradient brushes
      3m 15s
    3. Decorating elements with ImageBrush
      4m 56s
    4. Creating effects with VideoBrush
      6m 14s
  9. 25m 42s
    1. Understanding routed events
      3m 12s
    2. Wiring up event handlers in Silverlight
      6m 4s
    3. Understanding event bubbling
      4m 39s
    4. Exploring mouse events
      7m 43s
    5. Exploring keyboard events
      4m 4s
  10. 32m 31s
    1. Displaying text on the screen
      3m 24s
    2. Gathering text input from the user
      5m 30s
    3. Showing complex text with RichTextBox
      6m 7s
    4. Understanding text overflow and text linking
      3m 14s
    5. Searching content with the AutoComplete type-ahead control
      6m 45s
    6. Using and embedding Silverlight fonts
      7m 31s
  11. 26m 47s
    1. Understanding content controls
      5m 7s
    2. Understanding button controls
      6m 16s
    3. Using the BusyIndicator
      4m 40s
    4. Showing tooltips
      4m 34s
    5. Changing content size with ViewBox
      1m 39s
    6. Exploring more controls
      4m 31s
  12. 55m 36s
    1. Connecting elements with binding
      9m 54s
    2. Using business data in a binding
      9m 21s
    3. Listing data with ItemsControls
      6m 39s
    4. Digging into the DataGrid
      8m 28s
    5. Using the DataForm
      3m 49s
    6. Storing data on the client
      7m 10s
    7. Debugging XAML bindings
      5m 41s
    8. Charting data
      4m 34s
  13. 24m 36s
    1. Creating an Out-of-Browser (OOB) application
      6m 16s
    2. Controlling aspects of an OOB application
      2m 49s
    3. Alerting the user with notification windows
      7m 13s
    4. Hosting HTML content in Silverlight applications
      8m 18s
  14. 30m 2s
    1. Exploring Silverlight trust levels
      3m 51s
    2. Creating an elevated trust application
      5m 57s
    3. Reaping the benefits of XAP signing
      6m 5s
    4. Making cross-domain calls
      5m 1s
    5. Getting started with COM Interop using the Speech API
      4m 21s
    6. Using COM Interop to interact with Microsoft Office
      4m 47s
  15. 16m 33s
    1. Showing child windows
      3m 48s
    2. Using a child window as a dialog window
      5m 7s
    3. Creating native windows
      2m 53s
    4. Maximizing a window with full screen mode
      4m 45s
  16. 13m 20s
    1. Dynamically loading UI content with user controls
      4m 46s
    2. Using the Navigation Framework
      8m 34s
  17. 9m 28s
    1. Using resource files
      3m 53s
    2. Using images in an application
      5m 35s
  18. 16m 32s
    1. Playing audio
      4m 27s
    2. Playing sound effects
      5m 4s
    3. Viewing video content with MediaElement
      4m 58s
    4. Changing video playback speed with TrickPlay
      2m 3s
  19. 14m 40s
    1. Capturing video with a web camera
      4m 16s
    2. Working with a microphone
      3m 47s
    3. Creating print output
      6m 37s
  20. 22m 35s
    1. Understanding Silverlight animations
      4m 35s
    2. Creating animations
      7m 52s
    3. Controlling animations
      4m 18s
    4. Simulating physics with animation easings
      5m 50s
  21. 27m 47s
    1. Placing XAML resources within a FrameworkElement
      6m 47s
    2. Centralizing settings in styles
      4m 8s
    3. Creating an alternate control UI with ControlTemplates
      6m 29s
    4. Dressing up your data with DataTemplates
      4m 33s
    5. Explaining the VisualStateManager: a simple way to manage control states
      5m 50s
  22. 10m 55s
    1. Handling global errors in a Silverlight application
      5m 46s
    2. Showing an application loading screen
      5m 9s
  23. 10m 48s
    1. Integrating with XNA
      7m 40s
    2. Exploring data analysis with PivotViewer
      3m 8s
  24. 1m 6s
    1. Goodbye
      1m 6s

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