C#のWPFアプリでマルチモニタそれぞれに全画面表示する

参照の追加

「参照の追加」→「アセンブリ」で下記の参照を追加する。

• System.Windows.Forms
• System.Drawing

ソース

using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Forms;

namespace DualMonitor2
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            const int MONITOR1 = 0;
            const int MONITOR2 = 1;

            if (Screen.AllScreens.Length < 2)
            {
                Console.WriteLine("Not Multi Monitors!");
            }
            else
            {
                Screen Screen1 = Screen.AllScreens[MONITOR1];
                Screen Screen2 = Screen.AllScreens[MONITOR2];

                var bounds1 = Screen1.Bounds;
                Window window2 = new Window
                {
                    Background = new SolidColorBrush(Colors.Red),
                    WindowStartupLocation = WindowStartupLocation.Manual,
                    WindowState = WindowState.Normal,
                    WindowStyle = WindowStyle.None,
                    //Topmost = true,
                    Left = bounds1.Left,
                    Top = bounds1.Top,
                    Width = bounds1.Width,
                    Height = bounds1.Height
                };
                window2.Show();
                window2.WindowState = WindowState.Maximized;

                var bounds2 = Screen2.Bounds;
                Window window3 = new Window
                {
                    Background = new SolidColorBrush(Colors.Blue),
                    WindowStartupLocation = WindowStartupLocation.Manual,
                    WindowState = WindowState.Normal,
                    WindowStyle = WindowStyle.None,
                    //Topmost = true,
                    Left = bounds2.Left,
                    Top = bounds2.Top,
                    Width = bounds2.Width,
                    Height = bounds2.Height
                };
                window3.Show();
                window3.WindowState = WindowState.Maximized;
            }
        }
    }
}