恢复的WPF窗口

Question

I have an option to start my mainwindow minimized. The window is set to SizeToContent="WidthAndHeight". when I click to restore the window it opens larger than the initial WidthAndHeight. I use the following in the MainWindow.xaml.cs

   private void WindowStart()
    {
        if (LocalSystem.StartMinimized)
        {
            WindowState = WindowState.Minimized;
            ShowInTaskbar = true;
        }
        if (LocalSystem.StartOnTop)
        {
            Topmost = true;
        }
        Activate();
    }

Answer 1

Consider keeping track of the state change of your WPF window. Add an event handler of the StateChanged event of your Window and keep track of the Window width and height.

You could keep track of the size of the window like this:

public MainWindow() {

 InitializeComponent();
  _lastState = this.WindowState;
  _initialWidth = this.ActualWidth;
  _initialHeight = this.ActualHeight;
   this.StateChanged += Window_StateChanged;
}


    WindowState _lastState;
    double _initialwidth, _initialHeight;

    private void Window_StateChanged(object sender, EventArgs e)
    {
        if (this.WindowState != _lastState)
        {
          if (_lastState == WindowState.Minimized && this.WindowState == WindowState.Maximized){
            this.Width = _initialWidth;
            this.Height = _initialHeight;

           }
           _lastState = this.WindowState;

        }
    }

Note the use of ActualHeight and ActualWidth. The Window actual dimensions will be known after InitializeComponent is run inside its constructor. A restored or unminized, as you so eloquently put it, window is window where the State goes from WindowState.Minimized to WindowState.Maximized.

Note that we try to minimize the amount of code behind in WPF apps, as a best practice is to use MVVM. You could though consider creating a WPF behavior class for restoring initial size of Window, after all it is a generic behavior.