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Application.Run Method (Window)

Starts a Windows Presentation Foundation (WPF) application and opens the specified window.

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

public int Run(
	Window window
)

Parameters

window
Type: System.Windows.Window

A Window that opens automatically when an application starts.

Return Value

Type: System.Int32
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.

ExceptionCondition
InvalidOperationException

Run is called from a browser-hosted application (for example, an XAML browser application (XBAP)).

This overload extends the Run method to open the specified window after an application starts running.

If you define a code Application that opens a window when it starts running, you explicitly call Run.

If you create your Application using markup, or markup and code-behind, you can automatically open a window during using either of the following techniques:

The following example shows an application with a manually-created static entry point method that instantiates Application, before calling 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()
        {
            Application app = new Application();
            app.Run(new Window());
        }
    }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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