Application.Run Method ()

Starts a Windows Presentation Foundation (WPF) application.

Namespace: System.Windows
Assembly: PresentationFramework (in presentationframework.dll)

public int Run ()
public int Run ()
public function Run () : int
You cannot use methods in XAML.

Return Value

The Int32 application exit code that is returned to the operating system when the application shuts down. By default, the exit code value is 0.

Exception typeCondition

InvalidOperationException

Run is called from a browser-hosted application eg an XAML browser application (XBAP).

Run is called to start a WPF application. If you define your Application using markup, or markup and code-behind, Run will be called implicitly. However, if you define your Application using code, you will need to explicitly call Run.

When Run is called, Application attaches a new Dispatcher instance to the UI thread. Next, the Dispatcher object's Run method is called, which starts a message pump to process windows messages. Finally, the Dispatcher object calls the Application object's the OnStartup method to raise the Startup event. Consequently, the application execution model has been established by the time you handle Startup, at which point the application is considered to be running.

An application stops running when Shutdown is called; the value of the ShutdownMode property determines when Shutdown is called, and whether it happens automatically or you need to explicitly call it.

Run can be called only from the thread that creates the Application object. Also, Run cannot be called from a XBAP.

The following example shows an application that uses a custom Application and must therefore explicitly call Run.

using System;
using System.Windows;

namespace CSharp
{
    public class EntryPoint
    {
        // All WPF applications should execute on a single-threaded apartment (STA) thread
        [STAThread]
        public static void Main()
        {
            CustomApplication app = new CustomApplication();
            app.Run();
        }
    }

    public class CustomApplication : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            Window window = new Window();
            window.Show();
        }
    }
}

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0
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