Try a sample online or download the source code.
- Go to the Project Properties window (Right click on the Silverlight project in Visual Studio 2008 and choose ‘Properties’).
- On the ‘Silverlight’ tab, select ‘Enable running application out of the browser’.
- Click on the ‘Out-of-Browser Settings…’ button.
- Fill or change the details like Window Title (Appears in the title bar of the out-of-browser application window), Width and Height (Indicates the dimensions of the out-of-browser application window; default is 800x600), Shortcut name (Appears in the out-of-browser installation dialog box and on the installed application shortcut or shortcuts), and Download description (Appears as a tooltip on the installed application shortcuts). Also assign application icon in a set of standard sizes (The operating system chooses the most appropriate icon to display in the installation dialog box, the application window, Windows Explorer, and Windows taskbar/Macintosh dock bar). These icons must be ‘png’ files and need to be added to the project initially with ‘Build Action’ set as ‘Content’. Optionally, 'Enable GPU Acceleration' can be turned on for graphics rich applications to enhance graphics performance by using hardware acceleration.
The values in the ‘Out-of-Browser Settings’ dialog box is used to generate an ‘OutOfBrowserSettings.xml’ file located in the project Properties folder. Any changes to this file are reflected in the designer. This file is used to populate the application manifest (AppManifest.xaml) with the specified values.
When an application is properly configured for OOB, a new right-click menu option will be available as ‘Install <ApplicationName> Application onto this computer…’. Clicking on this will launch the installer dialog where the user can choose to create shortcuts on Start menu and Desktop. When ‘OK’ is clicked, the application will be installed to the local computer and it will be launched in a new application window. ‘Remove this application…’ right-click menu will now be available within this application to uninstall it from the computer.
If you look at the installed application’s shortcut properties, you will see that the target points to ‘C:\Program Files\Microsoft Silverlight\sllauncher.exe 1527765212.localhost’.
If you search for that random number (in my case: 1527765212) in Windows explorer, you will find a folder like this:
sllauncher.exe is the ‘Microsoft Silverlight Out-of-Browser Launcher’ application that gets installed along with Silverlight. It is a win32 application that loads the Silverlight application in its own browser host.
When you install a Silverlight OOB application, the XAP file is downloaded to the local computer and is stored in a folder within the user’s local app data called as ‘offline application cache’. The folder is named with a unique AppId which consists of a random number and the source of origin of the application (in this case: localhost). This folder will also have the application meta data and an index.html which has an object tag to load the Silverlight application.
sllauncher.exe takes this AppId (Examples: 1527765212.localhost, 1930341777.wayfarer.bizhat.com) as a parameter and then sets its window according to the metadata available in the specified offline application cache. It then loads the index.html in its browser host which in turn will display the Silverlight application.
Sample ApplicationThere are a set of classes and methods available in Silverlight to install an application through code, to check for updates, to determine network status, etc. These are illustrated through the sample below:
Try this sample online or download the source code.