The Role of the Application Class
Regardless of which flavor of WPF application you create, they will all make use of the System.Windows.
Application type. This class represents a global running instance of a WPF application. It encapsulates a
number of core services such as handling messages, trapping unhandled exceptions, defining common
application data, and more.
A given WPF application will only have a single Application object. Unlike Windows Forms, the WPF
Application class exposes most services as instance-level members. Therefore, you will need to create a class
extending Application. This class is commonly termed the application object.
The Application class defines a number of key services. Here is a partial list of important members:
The application object will define the Main() method of your program, which must be marked with the
[STAThread] attribute. This attribute ensures that any legacy COM objects, ActiveX controls, and the
WPF controls load into a thread-safe environment. If you do not mark your Main() method with the
[STAThread] attribute, you will receive a runtime exception.
Here is a simple WPF application object:
// Define the global application object
// for this WPF program.
// C#
class MyApp : Application
{
[STAThread]
static void Main()
{
// Create an instance of MyApp.
// Handle events, run the application,
// launch the main window, etc.
}
}
' Define the global application object
' for this WPF program.
' VB
Class MyApp
Inherits Application
<STAThread> _
Shared Sub Main()
' Create an instance of MyApp.
' Handle events, run the application,
' launch the main window, etc.
End Sub
End Class
Your Main() method will be the place where you typically want to handle the Startup, Exit, and
DispatcherUnhandledException events. Also, your application object can define any number of application-
wide data points. You will build a more complete application object later in this chapter. For now, examine
the role of the Window class.
Regardless of which flavor of WPF application you create, they will all make use of the System.Windows.
Application type. This class represents a global running instance of a WPF application. It encapsulates a
number of core services such as handling messages, trapping unhandled exceptions, defining common
application data, and more.
A given WPF application will only have a single Application object. Unlike Windows Forms, the WPF
Application class exposes most services as instance-level members. Therefore, you will need to create a class
extending Application. This class is commonly termed the application object.
The Application class defines a number of key services. Here is a partial list of important members:
The application object will define the Main() method of your program, which must be marked with the
[STAThread] attribute. This attribute ensures that any legacy COM objects, ActiveX controls, and the
WPF controls load into a thread-safe environment. If you do not mark your Main() method with the
[STAThread] attribute, you will receive a runtime exception.
Here is a simple WPF application object:
// Define the global application object
// for this WPF program.
// C#
class MyApp : Application
{
[STAThread]
static void Main()
{
// Create an instance of MyApp.
// Handle events, run the application,
// launch the main window, etc.
}
}
' Define the global application object
' for this WPF program.
' VB
Class MyApp
Inherits Application
<STAThread> _
Shared Sub Main()
' Create an instance of MyApp.
' Handle events, run the application,
' launch the main window, etc.
End Sub
End Class
Your Main() method will be the place where you typically want to handle the Startup, Exit, and
DispatcherUnhandledException events. Also, your application object can define any number of application-
wide data points. You will build a more complete application object later in this chapter. For now, examine
the role of the Window class.
The Role of The Application Class
Table of Contents
Copyright (c) 2008. Intertech, Inc. All Rights Reserved. This information is to be used exclusively as an
online learning aid. Any attempts to copy, reproduce, or use for training is strictly prohibited.
online learning aid. Any attempts to copy, reproduce, or use for training is strictly prohibited.
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