Application Class

Definition

Namespace:

System.Windows

Assembly:

PresentationFramework.dll

Encapsulates a Windows Presentation Foundation application.

public ref class Application : System::Windows::Threading::DispatcherObject, System::Windows::Markup::IQueryAmbient

public class Application : System.Windows.Threading.DispatcherObject, System.Windows.Markup.IQueryAmbient

type Application = class
    inherit DispatcherObject
    interface IQueryAmbient

Public Class Application
Inherits DispatcherObject
Implements IQueryAmbient

Inheritance

Object

DispatcherObject

Application

Implements

IQueryAmbient

Examples

The following example shows how a standard application is defined using only markup:

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" />

The following example shows how a standard application is defined using only code:

using System;
using System.Windows;

namespace SDKSample
{
    public class AppCode : Application
    {
        // Entry point method
        [STAThread]
        public static void Main()
        {
            AppCode app = new AppCode();
            app.Run();
        }
    }
}

Imports System.Windows

Namespace SDKSample
    Public Class AppCode
        Inherits Application
        ' Entry point method
        <STAThread>
        Public Shared Sub Main()
            Dim app As New AppCode()
            app.Run()
        End Sub
    End Class
End Namespace

The following example shows how a standard application is defined using a combination of markup and code-behind.

<Application 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  x:Class="SDKSample.App" />

using System.Windows;

namespace SDKSample
{
    public partial class App : Application { }
}

Imports System.Windows

Namespace SDKSample
    Partial Public Class App
        Inherits Application
    End Class
End Namespace

Remarks

Application is a class that encapsulates WPF application-specific functionality, including the following:

• Application Lifetime: Activated, Current, Deactivated, DispatcherUnhandledException, Exit, Run, SessionEnding, Shutdown, ShutdownMode, Startup.

• Application-Scope Window, Property, and Resource Management: FindResource, GetContentStream, GetResourceStream, LoadComponent, MainWindow, Properties, Resources, StartupUri, Windows.

• Command-Line Parameter and Exit Code Processing: Application.Startup, Application.Exit, Application.Shutdown.

• Navigation: FragmentNavigation, LoadCompleted, Navigated, Navigating, NavigationProgress, NavigationStopped, NavigationFailed, SetCookie, GetCookie.

Application implements the singleton pattern to provide shared access to its window, property, and resource scope services. Consequently, only one instance of the Application class can be created per AppDomain.

You can implement an Application using markup, markup and code-behind, or code. If Application is implemented with markup, whether markup or markup and code-behind, the markup file must be configured as an Microsoft build engine (MSBuild) ApplicationDefinition item.

Note

A standalone application does not require an Application object; it is possible to implement a custom static entry point method (Main) that opens a window without creating an instance of Application. However, XAML browser applications (XBAPs) require an Application object.

Constructors

Application()

Initializes a new instance of the Application class.

Properties

Current	Gets the Application object for the current AppDomain.
Dispatcher	Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject)
MainWindow	Gets or sets the main window of the application.
Properties	Gets a collection of application-scope properties.
ResourceAssembly	Gets or sets the Assembly that provides the pack uniform resource identifiers (URIs) for resources in a WPF application.
Resources	Gets or sets a collection of application-scope resources, such as styles and brushes.
ShutdownMode	Gets or sets the condition that causes the Shutdown() method to be called.
StartupUri	Gets or sets a UI that is automatically shown when an application starts.
ThemeMode	Gets or sets the Fluent theme mode of the application.
Windows	Gets the instantiated windows in an application.

Methods

CheckAccess()	Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
FindResource(Object)	Searches for a user interface (UI) resource, such as a Style or Brush, with the specified key, and throws an exception if the requested resource is not found (see XAML Resources).
GetContentStream(Uri)	Returns a resource stream for a content data file that is located at the specified Uri (see WPF Application Resource, Content, and Data Files).
GetCookie(Uri)	Retrieves a cookie for the location specified by a Uri.
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetRemoteStream(Uri)	Returns a resource stream for a site-of-origin data file that is located at the specified Uri (see WPF Application Resource, Content, and Data Files).
GetResourceStream(Uri)	Returns a resource stream for a resource data file that is located at the specified Uri (see WPF Application Resource, Content, and Data Files).
GetType()	Gets the Type of the current instance. (Inherited from Object)
LoadComponent(Object, Uri)	Loads a XAML file that is located at the specified uniform resource identifier (URI) and converts it to an instance of the object that is specified by the root element of the XAML file.
LoadComponent(Uri)	Loads a XAML file that is located at the specified uniform resource identifier (URI), and converts it to an instance of the object that is specified by the root element of the XAML file.
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnActivated(EventArgs)	Raises the Activated event.
OnDeactivated(EventArgs)	Raises the Deactivated event.
OnExit(ExitEventArgs)	Raises the Exit event.
OnFragmentNavigation(FragmentNavigationEventArgs)	Raises the FragmentNavigation event.
OnLoadCompleted(NavigationEventArgs)	Raises the LoadCompleted event.
OnNavigated(NavigationEventArgs)	Raises the Navigated event.
OnNavigating(NavigatingCancelEventArgs)	Raises the Navigating event.
OnNavigationFailed(NavigationFailedEventArgs)	Raises the NavigationFailed event.
OnNavigationProgress(NavigationProgressEventArgs)	Raises the NavigationProgress event.
OnNavigationStopped(NavigationEventArgs)	Raises the NavigationStopped event.
OnSessionEnding(SessionEndingCancelEventArgs)	Raises the SessionEnding event.
OnStartup(StartupEventArgs)	Raises the Startup event.
Run()	Starts a Windows Presentation Foundation application.
Run(Window)	Starts a Windows Presentation Foundation application and opens the specified window.
SetCookie(Uri, String)	Creates a cookie for the location specified by a Uri.
Shutdown()	Shuts down an application.
Shutdown(Int32)	Shuts down an application that returns the specified exit code to the operating system.
ToString()	Returns a string that represents the current object. (Inherited from Object)
TryFindResource(Object)	Searches for the specified resource.
VerifyAccess()	Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject)

Events

Activated	Occurs when an application becomes the foreground application.
Deactivated	Occurs when an application stops being the foreground application.
DispatcherUnhandledException	Occurs when an exception is thrown by an application but not handled.
Exit	Occurs just before an application shuts down and cannot be canceled.
FragmentNavigation	Occurs when a navigator in the application begins navigation to a content fragment, Navigation occurs immediately if the desired fragment is in the current content, or after the source XAML content has been loaded if the desired fragment is in different content.
LoadCompleted	Occurs when content that was navigated to by a navigator in the application has been loaded, parsed, and has begun rendering.
Navigated	Occurs when the content that is being navigated to by a navigator in the application has been found, although it may not have completed loading.
Navigating	Occurs when a new navigation is requested by a navigator in the application.
NavigationFailed	Occurs when an error occurs while a navigator in the application is navigating to the requested content.
NavigationProgress	Occurs periodically during a download that is being managed by a navigator in the application to provide navigation progress information.
NavigationStopped	Occurs when the StopLoading method of a navigator in the application is called, or when a new navigation is requested by a navigator while a current navigation is in progress.
SessionEnding	Occurs when the user ends the Windows session by logging off or shutting down the operating system.
Startup	Occurs when the Run() method of the Application object is called.

Explicit Interface Implementations

IQueryAmbient.IsAmbientPropertyAvailable(String)

Queries for whether a specified ambient property is available in the current scope.

Thread Safety

The public static (Shared in Visual Basic) members of this type are thread safe. In addition, the FindResource(Object) and TryFindResource(Object) methods and the Properties and Resources properties are thread safe.

See also

• Window