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Silverlight 5 Essential Training
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Creating an elevated trust application


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Silverlight 5 Essential Training

with Walt Ritscher

Video: Creating an elevated trust application

In the previous chapter in the series, I showed you how to create an out-of-browser app. Here, in this movie I want to concentrate on a special kind of OOB application known as an elevated trust application. At its simplest, it's just a matter of changing a configuration setting. Let me show you how. I'm inside Visual Studio and I've opened the CreateElevatedTrust project. Inside this application, I'm going to click on the Properties node in the Solution Explorer and show you, in this Silverlight section, that this is an out-of-browser application, and for debugging purposes, I'm telling it to dynamically generate a test page.
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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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Silverlight 5 Essential Training
8h 51m Beginner Mar 27, 2012

Viewers: in countries Watching now:

Microsoft Silverlight 5 is a rich application framework for creating high-performance, cross-platform desktop and mobile applications. In this course, author Walt Ritscher demonstrates how to build a variety of applications in Silverlight, with particular focus on building compelling business applications and delivering premium video and audio content. Developers will work with the C# programming language and Visual Studio Professional, as well as Expression Blend, a tool that simplifies creation of the interactive user interfaces expected in modern-day applications.

Topics include:
  • Installing the toolkit and setting up the development environment
  • Using Expression Blend vs. Visual Studio 2010
  • Creating a Silverlight page
  • Compiling an application
  • Exploring the relationship between XAML and .NET
  • Using C#
  • Working with XAML
  • Digging into the Dependency Property System
  • Deploying and debugging code
  • Creating sophisticated layouts with panel elements
  • Managing Visual State with Visual State Manager
  • Transforming the user interface (UI) with templates
  • Understanding the event model
  • Working with text
  • Using business data in a binding
  • Creating an out-of-browser (OOB) application
  • Exploring trust levels
  • Playing audio and video
  • Handling errors
  • Exploring animations
  • Working with application windows
  • Integration with XNA
Subject:
Developer
Software:
Silverlight Visual Studio
Author:
Walt Ritscher

Creating an elevated trust application

In the previous chapter in the series, I showed you how to create an out-of-browser app. Here, in this movie I want to concentrate on a special kind of OOB application known as an elevated trust application. At its simplest, it's just a matter of changing a configuration setting. Let me show you how. I'm inside Visual Studio and I've opened the CreateElevatedTrust project. Inside this application, I'm going to click on the Properties node in the Solution Explorer and show you, in this Silverlight section, that this is an out-of-browser application, and for debugging purposes, I'm telling it to dynamically generate a test page.

So, when I press F5, I see the standard out-of-browser experience. There is a web page. I can right-click and choose Install CreateElevatedTrust Application, I get the standard dialog with the standard logo, and if I click OK, it'll install it locally. Now, I want to make this an elevated trust application, so I go back to Visual Studio and I choose the Out-of-Browser Settings button and I simply check mark this Require elevated trust when running outside the browser.

While I'm in here, I can also change the default look of the window. I can add a no-border window or make it a borderless-round-corner window. I'll choose the Borderless Round Corners option and then click OK. Okay, now let's run the application again by pressing F5, and I'm going to right-click and choose Install, and you notice that the dialog is now a different color. It's not as friendly looking. It says, "The publisher could not be verified. Are you sure you want to install this application?" This is because the application has a higher risk factor and this yellow dialog is an attempt to alert the user that this is a potentially un-trusted application.

Now that the application has a higher trust level, we can do more with it. Let's install the application and see. There it is, now running out-of-browser, and notice that it no longer has a title bar across the top, and it's got the rounded borderless corners. Now, remove the application. Permanently remove it, say Yes, and then I'm going to turn back to Visual Studio, and I'm gong to write some code to allow me to access the user's music folder, now that I have some elevated privileges. While I'm back here in Visual Studio, I'm also going to take off the rounded corners.

I'm going to go back to the default look. I want to show the user a list of music files on my hard drive. Through the Open File dialog and the Save dialog classes, any Silverlight application can access the local file system. If I'm inside an elevated trust application then I get a little more privileges. It's possible for me to programmatically access file areas without the user interaction. So, I'm allowed to automatically parse the user folders, like My Documents, My Pictures, and My Music. I need to get some music in the Music folder.

So, let's go out to my hard drive. I'm going to go to my Desktop, find the exercise files folder, and I have a Music folder here, and I'm going to copy a couple of these files--number 4 and number 5--into my Music folder. There they are. And then I'm going to show those to my user in my Silverlight application. So, we'll return back to Visual Studio, I'll go to my code behind page on MainPage.xaml.cs by double-clicking, and I'm going to write some code here.

The first thing I'm going to do is check that I'm in an elevated privilege application. If I am, then I'm going to get a hold of the folder where my music files live. To do that, I'm going to create this variable called path and I'm going to go to my Silverlight application and say I want some information about my environments. I'm interested in getting a folder on the hard drive that is a special folder named My Music. What this will do when the application runs is it will find out who the user is on the local computer and find their specific music folder, wherever that lives.

And then I've got my ListBox, which I want to populate with this data. And to do that, I'm going to use the Directory class, which gives me access to the directories on the hard drive, and I'm going to call this function called EnumerateFiles. This lets me walk through all of the individual files that are inside that folder, and I tell it which folder I want by giving it the path. So, with these lines of code, I'm finding the local folder and passing that to EnumerateFiles. That's going to list all the files and then pass the list to the item source, and then the musicListBox will show them.

I'm going to put a break point right here by pressing F9, and then I'm going to run the application by pressing F5. I'm going to install the CreateElevatedTrust Application. I'll go through the yellow prompt, go ahead and click Install, and now I should be able to click on this Open Music List and as you can see, my music files show up. Success. This is great! You notice that I put a break point in my code. Normally, when you put a break point in your code that means that Visual Studio will stop there and let me examine my code and look at the variables and such.

That is not happening because I have to tell the debugger to attach to this process in a special way. Let me close this dialog, uninstall the application, choose Yes here. And then here's the key to debugging an elevated trust application. You need to go back to your Property section and find the Debug tab and choose Start Sction > Out-of-browser application. Now what happens when I press F5 is that it automatically installs the application and attaches the debugger now to the elevated trust app. And now you see I switch over to my code behind and I get the yellow arrow signifying that I'm stepping through the code.

I can then step through those lines of code and hover over this variable to see where the actual location is on my hard drive for that data. There's a lot more that you can do with an elevated trust application, as you'll find out in other movies in this chapter.

Find answers to the most frequently asked questions about Silverlight 5 Essential Training.


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Q: I'm trying to access a Silverlight 3D application template, [cid:image001.png@01CD0E7D.3E07ECA0]. I have already installed the Silverlight 5 SDK and my Visual Studio 2010 is professional. Could you please help me?
A: You must install XNA Studio in order to use the new Silverlight 3D templates. Otherwise the new templates will not show up. Download it at http://www.microsoft.com/download/en/details.aspx?id=23714.

For other Silverlight downloads (the toolkit, developer runtime, etc.), see http://www.silverlight.net/downloads.
 
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