WPF中如何高效率取得目前螢幕尺寸？

WPF：取得目前螢幕的尺寸

使用SystemParameters 擷取主畫面的尺寸很簡單，但確定目前螢幕的尺寸畫面可能更複雜，尤其是在多螢幕配置中。為了應對這項挑戰，請考慮以下方法：

利用WinForms 螢幕包裝器

圍繞System.Windows.Forms.Screen 物件建立與WPF 相容的包裝器存取螢幕相關資訊的便捷方式。以下是一個範例實作：

public class WpfScreen
{
    public static IEnumerable<WpfScreen> AllScreens()
    {
        foreach (Screen screen in System.Windows.Forms.Screen.AllScreens)
        {
            yield return new WpfScreen(screen);
        }
    }

    public static WpfScreen GetScreenFrom(Window window)
    {
        WindowInteropHelper windowInteropHelper = new WindowInteropHelper(window);
        Screen screen = System.Windows.Forms.Screen.FromHandle(windowInteropHelper.Handle);
        WpfScreen wpfScreen = new WpfScreen(screen);
        return wpfScreen;
    }

    public static WpfScreen GetScreenFrom(Point point)
    {
        int x = (int)Math.Round(point.X);
        int y = (int)Math.Round(point.Y);
        System.Drawing.Point drawingPoint = new System.Drawing.Point(x, y);
        Screen screen = System.Windows.Forms.Screen.FromPoint(drawingPoint);
        WpfScreen wpfScreen = new WpfScreen(screen);
        return wpfScreen;
    }

    public static WpfScreen Primary
    {
        get { return new WpfScreen(System.Windows.Forms.Screen.PrimaryScreen); }
    }

    private readonly Screen screen;

    internal WpfScreen(System.Windows.Forms.Screen screen)
    {
        this.screen = screen;
    }

    public Rect DeviceBounds
    {
        get { return this.GetRect(this.screen.Bounds); }
    }

    public Rect WorkingArea
    {
        get { return this.GetRect(this.screen.WorkingArea); }
    }

    private Rect GetRect(Rectangle value)
    {
        return new Rect
        {
            X = value.X,
            Y = value.Y,
            Width = value.Width,
            Height = value.Height
        };
    }

    public bool IsPrimary
    {
        get { return this.screen.Primary; }
    }

    public string DeviceName
    {
        get { return this.screen.DeviceName; }
    }
}

在XAML 中存取螢幕尺寸

雖然無法直接從XAML 存取螢幕尺寸，但您可以組合使用附加屬性與包裝類：

<UserControl>
    <UserControl.Resources>
        <local:WpfScreenExtension x:Key="ScreenExtension" />
    </UserControl.Resources>

    <StackPanel>
        <TextBlock Text="Device Bounds Width: {Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=Width, Converter={StaticResource ScreenExtension}}" VerticalAlignment="Center" />
        <TextBlock Text="Working Area Height: {Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=Height, Converter={StaticResource ScreenExtension}}" VerticalAlignment="Center" />
    </StackPanel>
</UserControl>

public class WpfScreenExtension : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        UserControl userControl = value as UserControl;
        if (userControl == null)
            return null;

        Rect bounds = WpfScreen.GetScreenFrom(userControl).DeviceBounds;
        if (bounds.IsEmpty)
            return String.Empty;

        if (parameter?.ToString() == "Width")
            return bounds.Width;
        else if (parameter?.ToString() == "Height")
            return bounds.Height;
        else
            return bounds;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return null;
    }
}

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