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Debugging your code

From: Silverlight 5 Essential Training

Video: Debugging your code

Debugging is a critical skill to have as a developer. In this movie, I will show you a few debugging tools inside Visual Studio. I've opened a project called DebuggingSilverlight. I'll double-click on MainPage.xaml. This page has a simple UI with three buttons for testing different debugging scenarios. I'll start by looking at this first button. I'll double-click on the button and look at this code here. I'm using the Debug class and the WriteLine method. What this will do by default is output the string to the output window.

Debugging your code

Debugging is a critical skill to have as a developer. In this movie, I will show you a few debugging tools inside Visual Studio. I've opened a project called DebuggingSilverlight. I'll double-click on MainPage.xaml. This page has a simple UI with three buttons for testing different debugging scenarios. I'll start by looking at this first button. I'll double-click on the button and look at this code here. I'm using the Debug class and the WriteLine method. What this will do by default is output the string to the output window.

I've decided to bracket the call to this method in a Debug.WriteLine where I say this is before the call, and this is after the call. To test this, I need to create a Debug build and I need to attach a debugger. That's easy to do in Visual Studio by choosing Debug>Start Debugging. Before I do this, I'd like to say that it's best if you use Internet Explorer while debugging. Now, I'll click on my Debug button, and if you look here in Visual Studio, you can see a Before Call and an After Call in my output window.

I'll close the browser and return back to Visual Studio. The Debug class also has the assert method. I can use it like this Debug.Assert. It says here that it Checks for condition and outputs the call stack if the condition is false. So, what I want to do is check whether this int value is a positive number. So, I'll say Debug.Assert(tourId>0) and it'll test for a positive number. And you'll see when I'm calling it up here in line 30, when I clicking the button, I am passing a -12.

Let's test this scenario. Press F5 to run the application and attach a debugger. Click on the button again, and you see I get this Assertion Failed dialog. It tells me that something is wrong and it tells me where the assertion failed. This gives me the call stack. I'll close the browser and return back to Visual Studio. Visual Studio, like most modern IDE, supports adding breakpoints to your code windows. A breakpoint is a signal to the debugger to stop the execution of your application and break into the code editor.

Note, you cannot edit code while in break mode; you need to stop the application, edit the code, and restart. I'm going to put two breakpoints inside this method called BreakpoinButton_Click. There're a couple of ways to add breakpoints. For one, you can move to a line of code and press F9. That toggles on or off the breakpoint. If I press F9 the second time, it toggles off the breakpoint. Another handy way of turning on and off breakpoints is to select a line of code and then go over here to the margin or that gutter and click over here.

Again, clicking on it a second time turns off the breakpoint. I have two breakpoints in here. I can put different conditions on these breakpoints. I can use hit count counters on the breakpoints. That's done by right-clicking on this red dot and choosing things like Condition, Hit Count, Filter and so on. I'm good to go. I'll choose Debug>Start Debugging, I'll click on the Add Breakpoint button, and you see I now have a yellow line on my first breakpoint. That signifies that I'm just about ready to run this line of code.

There's also a yellow arrow on the left border. I can step through my code by clicking on these buttons, Step Into, Step Over, and Step Out or by pressing their affiliated keystrokes like F10 or F11. Let's do that. I'll press F11, I'll move through a couple of lines of code, and then at this point, I want to rewind and replace some of that code. I want to retry the code is a better way of saying that. So, I can take this yellow arrow and drag it up to the statement. Now, I can try that again by pressing F11.

You can also hover over variables like casePrice or volumeDiscount to see the values. If I'd rather have a more permanent view of these instead of having to hover my mouse over those, I can use the watch window. So, let me show you that demo. Stop the application. I'll put a breakpoint in this method down here WatchButton_Click. I'll put a breakpoint right here, F9, and then I'll press F5 to start the application and attach a debugger and then I'll click on the WatchWindow button. Again, I've hit my breakpoint.

Visual Studio has a number of windows you can stack on the bottom of your screen, Autos, Locals, and Watch. I'm going to move over to my Watch window and then I'm going to type in the word message down here and then I'm going to press F11 to step through one line of code. As you can see, down here in my Watch window I can see the stored value that's inside that string, Cannot complete your print job, and I can do that with any of these variables. For instance, I can put the p variable here where I can say p.Name, and then as I step through my code, I can keep an eye in that Watch window and see their values.

Visual Studio is packed with debugging tools, many more than I can discuss in this course. To see more about the rich debugging tools available, I suggest you watch the Visual Studio 2010 Essential Training course. It has an entire chapter on the Visual Studio Debugging Tools. That course covers all the debugging windows, details about breakpoints, that fantastic IntelliTrace feature and more.

Show transcript

This video is part of

Image for Silverlight 5 Essential Training
Silverlight 5 Essential Training

106 video lessons · 5720 viewers

Walt Ritscher
Author

 
Expand all | Collapse all
  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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