What is the purpose of APP. XAML? How to pass Parameters and use them?

In Silverlight, there is an app. XAML and App. XAML. cs. What is it, what is its purpose, and how to pass parameters with it?

Using the public parameter in it is very simple. Suppose you can access it in mainpage. XAML. CS as follows:

 
(Application. CurrentAsAPP). yourpublicparam
 
 
Similarly, in the Silverlight Class Library Project, you can use the above method to access the variables in the app, because application. Current is global for the application.
 
 
App. XAML Source
 
 
App. XAML and App. XAML. CS exist in Silverlight and WPF projects.System. Windows. ApplicationClass Library. If you are familiar with winform development, you should be familiar with this. When the Silverlight application is started, the order is as follows:
 
 
No main () method
 
StartAppConstructor

   
  
 
   
SetApplication_startupEvent Handler boundApp. startupAttribute
 
   
SetApplication_exitEvent Handler boundApp. ExitAttribute
 
   
SetApplication_unhandledexceptionEvent Handler boundUnhandledexceptionAttribute
 
   
TriggerInitializecomponent 
 
  
 
 
Application_startup

   
  
 
   
Create a newPage object instance 
 
   
SetApp. rootvisual points to this page object 
 
  
 
 
Initializecomponent

   
  
 
   
CallApplication. loadcomponent, TransferUriObjectApp. XAML 
 
  
App. XAML usage
 
 
Define Global Resources: We can put application-level resources here, usingApplication. ResourcesAttribute access, commonly used include styles, data templates, and control templates.
 
Global Event Processing:Startup,ExitAndUnhandledexception.
 
 
Global ReferenceApplication. Current 
 
 
Specify rootvisible:RootvisualThis property is used to set the Silverlight startup control.StartupSet in the event.
 
 
Local InstallationApplication: UseInstallYou can install the application locally outside the browser.
 
 
Check for updates: Can be used for local InstallationCheckanddownloadupdateasyncMethod to check whether the. xap file is up to date