NOTE

Most methods accept both window and hwnd

TrackWindow

you can track/Save all your windows in a dictionary which can be used in ThemeService, or other stuff.

WindowHelper.TrackWindow(window);

RemoveWindowFromTrack

remove window from TrackWindow list.

WindowHelper.RemoveWindowFromTrack(window);

GetWindowForElement

return window from a UIElement:

Window window = WindowHelper.GetWindowForElement(element);

SwitchToThisWindow

WindowHelper.SwitchToThisWindow(window);

or

WindowHelper.SwitchToThisWindow(hwnd);

ReActivateWindow

WindowHelper.ReActivateWindow(window);

or

WindowHelper.ReActivateWindow(hwnd);

CreateWindowWithFrame

var windowWithFrame = WindowHelper.CreateWindowWithFrame();

//windowWithFrame.rootFrame
//windowWithFrame.window

SetWindowCornerRadius

WindowHelper.SetWindowCornerRadius(window, NativeValues.DWM_WINDOW_CORNER_PREFERENCE.DWMWCP_ROUND);

or

WindowHelper.SetWindowCornerRadius(hwnd, NativeValues.DWM_WINDOW_CORNER_PREFERENCE.DWMWCP_ROUND);

GetWindowCornerRadius

NativeValues.DWM_WINDOW_CORNER_PREFERENCE corner = WindowHelper.GetWindowCornerRadius(window);

GetTopLevelWindows

var topWindows = WindowHelper.GetTopLevelWindows();

GetProcessWindowList

var processWindowList = WindowHelper.GetProcessWindowList();

GetWindowText

var windowText = WindowHelper.GetWindowText(hwnd);

GetClassName

var windowClassName = WindowHelper.GetClassName(hwnd);

GetCurrentAppWindow

var appWindow = WindowHelper.GetCurrentAppWindow();

GetAppWindow / GetAppWindow2

// Use XamlRoot
var appWindow = WindowHelper.GetAppWindow(element);

or

// Use CompositionTarget and ContentIsland
var appWindow = WindowHelper.GetAppWindow2(element);

GetWindowHandle / GetWindowHandle2

// Use XamlRoot
var hwnd = WindowHelper.GetWindowHandle(element);

// or

// Use CompositionTarget and ContentIsland
var hwnd = WindowHelper.GetWindowHandle2(element);

GetAllWindowHandles

// Use CompositionTarget and ContentIsland
var hwnds = WindowHelper.GetAllWindowHandles();

GetAllWindowIds

// Use CompositionTarget and ContentIsland
var ids = WindowHelper.GetAllWindowIds();

GetAllAppWindows

// Use CompositionTarget and ContentIsland
var windowIds = WindowHelper.GetAllAppWindows();

RemoveWindowBorderAndTitleBar

WindowHelper.RemoveWindowBorderAndTitleBar(window);

// or

WindowHelper.RemoveWindowBorderAndTitleBar(hwnd);

MakeTransparentWindowClickThrough

WindowHelper.MakeTransparentWindowClickThrough(window);

// or

WindowHelper.MakeTransparentWindowClickThrough(hwnd);

ResizeAndCenterWindowToPercentageOfWorkArea

GetScreenSize

SetWindowOwner

WindowHelper.SetWindowOwner(parentHwnd, childHwnd);

FindWindow

var hwnd = WindowHelper.FindWindow(hwnd, "InputNonClientPointerSource");

SetForegroundWindow

WindowHelper.SetForegroundWindow(hwnd);

CenterOnScreen

var IsCentered = WindowHelper.CenterOnScreen(hwnd);

TryGetAllWindowIds

var windowIds = WindowHelper.TryGetAllWindowIds();

HideWindow

WindowHelper.HideWindow(hwnd);
// Or
//WindowHelper.HideWindow(window);

ShowWindow

WindowHelper.ShowWindow(hwnd);
// Or
//WindowHelper.ShowWindow(window);

GetDpiForWindow

var dpi = WindowHelper.GetDpiForWindow(hwnd);
// Or
//var dpi = WindowHelper.GetDpiForWindow(window);

GetWindowIcon

var iconId = WindowHelper.GetWindowIcon(hwnd);
// Or
//var iconId = WindowHelper.GetWindowIcon(window);

SetRegion

Create transparent regions.

Create a 200x200 hole in the window, Starting at location 100,100.

WindowHelper.SetRegion(window, ScreenRegion.Create(new Rect(0,0, window.Width, window.Height)) - ScreenRegion.Create(new Rect(100, 100, 200, 200)));

SetWindowSize

WindowHelper.SetWindowSize(window, width, height);

ShakeWindowAsync

await WindowHelper.ShakeWindowAsync(window);

MoveWindowToBottomRight

CenterWindowOnDisplay

Demo

you can run demo and see this feature.