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34 lines
2.6 KiB
Markdown
34 lines
2.6 KiB
Markdown
---
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title: "How to: Get and Set the Main Application Window"
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description: Follow this example to get and set the main application window within Windows Presentation Foundation (WPF) application.
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ms.date: "03/30/2017"
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "windows objects [WPF], setting"
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- "setting windows objects [WPF]"
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- "windows objects [WPF], getting"
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- "getting windows objects [WPF]"
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ms.assetid: ec902bc4-4a59-46f5-8ec1-963b46789356
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---
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# How to: Get and Set the Main Application Window
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This example shows how to get and set the main application window.
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## Example
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The first <xref:System.Windows.Window> that is instantiated within a Windows Presentation Foundation (WPF) application is automatically set by <xref:System.Windows.Application> as the main application window. The first <xref:System.Windows.Window> to be instantiated will most likely be the window that is specified as the startup uniform resource identifier (URI) (see <xref:System.Windows.Application.StartupUri%2A>).
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The first <xref:System.Windows.Window> could also be instantiated using code. One example is opening a window during application startup, like the following:
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[!code-csharp[HOWTOWindowManagementSnippets#FirstWindowUsingCodeCODEBEHIND](~/samples/snippets/csharp/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/CSharp/App.xaml.cs#firstwindowusingcodecodebehind)]
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[!code-vb[HOWTOWindowManagementSnippets#FirstWindowUsingCodeCODEBEHIND](~/samples/snippets/visualbasic/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/visualbasic/application.xaml.vb#firstwindowusingcodecodebehind)]
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Sometimes, the first instantiated <xref:System.Windows.Window> is not actually the main application window e.g. a splash screen. In this case, you can specify the main application window using markup, like the following:
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[!code-xaml[ApplicationMainWindowSnippets#SetApplicationMainWindowXAML](~/samples/snippets/xaml/VS_Snippets_Wpf/ApplicationMainWindowSnippets/XAML/App.xaml#setapplicationmainwindowxaml)]
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Whether the main window is specified automatically or manually, you can get the main window from <xref:System.Windows.Application.MainWindow%2A> using the following code, like the following:
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[!code-csharp[ApplicationMainWindowSnippets#GetApplicationMainWindowCODE](~/samples/snippets/csharp/VS_Snippets_Wpf/ApplicationMainWindowSnippets/CSharp/App.xaml.cs#getapplicationmainwindowcode)]
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[!code-vb[ApplicationMainWindowSnippets#GetApplicationMainWindowCODE](~/samples/snippets/visualbasic/VS_Snippets_Wpf/ApplicationMainWindowSnippets/visualbasic/application.xaml.vb#getapplicationmainwindowcode)]
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