How to set the app window height and width on WinUI3?

Question

I wanted to set the width of the app to cover the available width of the display, and wanted to increase the apps height when a function was invoked.

Answer 1

AppWindow.Resize(SizeInt32) Method

Answer 2

using Microsoft.UI.Windowing; // Import this

IntPtr hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this); // Assuming 'this' is your Window instance

var windowId = Win32Interop.GetWindowIdFromWindow(hwnd);

AppWindow appWindow = AppWindow.GetFromWindowId(windowId);

// Set the desired size using Resize()

appWindow.Resize(new SizeInt32(800, 600)); // Set width to 800 pixels and height to 600 pixels