Make it public

.gitignore

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+
+/.vs
+/obj
+/bin

App.xaml

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+<Application x:Class="MonitorControl.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:MonitorControl"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System.Runtime.InteropServices;
+using System.Windows;
+
+namespace MonitorControl
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        public App()
+        {
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                MessageBox.Show("This application runs only on Windows", "Monitor Control", MessageBoxButton.OK, MessageBoxImage.Exclamation);
+                Application.Current.Shutdown();
+            }
+        }
+    }
+}

MainWindow.xaml

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+<Window x:Class="MonitorControl.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:MonitorControl"
+        mc:Ignorable="d"
+        Title="Monitor Control"  
+        MinHeight="200" MinWidth="200" SizeToContent="WidthAndHeight" ResizeMode="NoResize"
+        MaxWidth="650"
+        Loaded="Window_Loaded"
+        >
+
+
+    <ListBox x:Name="MonitorList" ScrollViewer.HorizontalScrollBarVisibility="Disabled" SelectionMode="Single">
+        <ListBox.ItemContainerStyle>
+            <Style TargetType="ListBoxItem">
+                <Setter Property="Template">
+                    <Setter.Value>
+                        <ControlTemplate TargetType="ListBoxItem">
+                            <ContentPresenter/>
+                        </ControlTemplate>
+                    </Setter.Value>
+                </Setter>
+            </Style>
+        </ListBox.ItemContainerStyle>
+
+        <ListBox.ItemsPanel>
+            <ItemsPanelTemplate>
+                <WrapPanel  IsItemsHost="True"  Orientation="Horizontal" />
+            </ItemsPanelTemplate>
+        </ListBox.ItemsPanel>
+        <ListBox.ItemTemplate>
+            <DataTemplate>
+                <Grid Height="160" Width="180" Margin="5" >
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="100"/>
+                        <RowDefinition />
+                    </Grid.RowDefinitions>
+                    <Border BorderThickness="1" CornerRadius="3" Grid.RowSpan="2"  BorderBrush="{DynamicResource {x:Static SystemColors.ScrollBarBrushKey}}" />
+                    <Grid Grid.Row="0">
+                        <TextBlock Text="{Binding DeviceName}" TextWrapping="Wrap" Grid.RowSpan="2" HorizontalAlignment="Center" Margin="0,10,0,0"  >
+                        </TextBlock>
+                        <Rectangle HorizontalAlignment="Center"  Margin="0,35,0,0" VerticalAlignment="Top"
+                                   Width="{Binding DisplayWidth}" Height="53">
+                            <Rectangle.Stroke>
+                                <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.HighlightColorKey}}"/>
+                            </Rectangle.Stroke>
+                        </Rectangle>
+                    </Grid>
+                    <Grid Grid.Row="1" IsEnabled="{Binding IsEnabled}">
+                        <Slider HorizontalAlignment="Left" Margin="10,0,0,0" VerticalAlignment="Center" Width="116" Height="24"
+                                Maximum="100" SmallChange="1" TickPlacement="TopLeft" TickFrequency="25"  IsMoveToPointEnabled="True"
+                                Value="{Binding BrightnessLevel, Mode=OneWay}" ValueChanged="Slider_ValueChanged" />
+                        <Button HorizontalAlignment="Right" VerticalAlignment="Center" 
+                                Width="32" Height="32" Margin="0,0,10,0"
+                                Content="{Binding PowerText, Mode=OneWay}" Click="Button_Click" />
+                    </Grid>
+                </Grid>
+            </DataTemplate>
+        </ListBox.ItemTemplate>
+    </ListBox>
+
+</Window>

MainWindow.xaml.cs

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+using System.Collections.Generic;
+using System.Windows;
+using System.Linq;
+using System.ComponentModel;
+using System;
+
+namespace MonitorControl
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        MonitorManager manager;
+
+        public List<MonitorData> Monitors = null;
+
+        private void Window_Loaded(object sender, RoutedEventArgs e)
+        {
+            manager = new MonitorManager();
+            manager.Initialize();
+
+            Monitors = manager.Monitors
+                .SelectMany(a => a.physicalMonitors.Select(b => new MonitorData(b, a.rect)))
+                .OrderBy(r => r.PositionX)
+                .ToList();
+
+            MonitorList.ItemsSource = Monitors;
+
+        }
+
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            FrameworkElement fe = sender as FrameworkElement;
+            MonitorData monitor = ((MonitorData)fe.DataContext);
+
+            monitor.SwitchPower();
+            manager.ChangePower(monitor.Ref.hPhysicalMonitor, monitor.IsPoweredOn);
+
+
+        }
+
+        private void Slider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
+        {
+            FrameworkElement fe = sender as FrameworkElement;
+            MonitorData monitor = ((MonitorData)fe.DataContext);
+
+            monitor.Ref.BrightnessLevel = (uint)e.NewValue;
+
+            manager.ChangeBrightness(monitor.Ref.hPhysicalMonitor, monitor.BrightnessLevel);
+        }
+    }
+
+    public class MonitorData : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public MonitorData(PhysicalMonitor physicalMonitor, Rect rect)
+        {
+            this.Ref = physicalMonitor;
+            IsLandspace = (rect.Right - rect.Left) / (float)(rect.Bottom - rect.Top) > 1.0f;
+            PositionX = rect.Left;
+        }
+
+        public PhysicalMonitor Ref { get; private set; }
+        public string DeviceName { get { return Ref.IsEnabled ? Ref.DeviceName : "Generic Monitor"; } }
+        public bool IsEnabled { get { return Ref.IsEnabled; } }
+        public bool IsPoweredOn { get { return Ref.IsEnabled ? Ref.IsPoweredOn : false; } }
+        public uint BrightnessLevel { get { return Ref.IsEnabled ? Ref.BrightnessLevel : 0; } }
+
+        public bool IsLandspace { get; private set; }
+        public int PositionX { get; private set; }
+        public int DisplayWidth { get { return IsLandspace ? 96 : 30; } }
+        public string PowerText { get { return IsPoweredOn ? "OFF" : "ON"; } }
+
+        internal void SwitchPower()
+        {
+            this.Ref.IsPoweredOn = !this.Ref.IsPoweredOn;
+            PropertyChanged(this, new PropertyChangedEventArgs("PowerText"));
+        }
+    }
+
+}

MonitorApi.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+
+namespace MonitorControl
+{
+
+
+
+
+    public class MonitorApi : IDisposable
+    {
+
+        public void TEST()
+        {
+            List<(IntPtr ptr, Rect rect, int d)> hMonitors = new List<(IntPtr, Rect, int)>();
+
+            MonitorEnumProc callback = (IntPtr hDesktop, IntPtr hdc, ref Rect prect, int d) =>
+            {
+                hMonitors.Add((hDesktop, prect, d));
+                return true;
+            };
+
+            List<PHYSICAL_MONITOR> monitors = new List<PHYSICAL_MONITOR>();
+            if (EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, callback, 0))
+            {
+                foreach (var m in hMonitors)
+                {
+                    uint mcount = 0;
+                    if (!GetNumberOfPhysicalMonitorsFromHMONITOR(m.ptr, ref mcount))
+                    {
+                        throw new Exception("Cannot get monitor count!");
+                    }
+                    PHYSICAL_MONITOR[] physicalMonitors = new PHYSICAL_MONITOR[mcount];
+
+                    if (!GetPhysicalMonitorsFromHMONITOR(m.ptr, mcount, physicalMonitors))
+                    {
+                        throw new Exception("Cannot get phisical monitor handle!");
+                    }
+
+                    Debug.WriteLine($"PM:{physicalMonitors.Length}) RECT: T:{m.rect.top}/L:{m.rect.left}/R:{m.rect.right}/B:{m.rect.bottom}  SCALE:{m.d}");
+                    monitors.AddRange(physicalMonitors);
+                }
+
+                for (int i = 0; i < monitors.Count; i++)
+                {
+
+                    uint cv = 0, mv = 0;
+                    if (GetVCPFeatureAndVCPFeatureReply(monitors[i].hPhysicalMonitor, SVC_FEATURE__POWER_MODE, IntPtr.Zero, ref cv, ref mv))
+                    {
+                        Debug.WriteLine($"{i}) {monitors[i].hPhysicalMonitor} + {monitors[i].szPhysicalMonitorDescription} + `{cv}/{mv}`");
+                    }
+                    else
+                    {
+                        string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
+                        Debug.WriteLine($"{i}) ERROR: {errorMessage}");
+
+                        // TODO:  use HighLevel API to set brightness on these monitors
+                        // https://docs.microsoft.com/en-us/windows/win32/api/highlevelmonitorconfigurationapi/nf-highlevelmonitorconfigurationapi-setmonitorbrightness
+                    }
+                }
+
+                // call power
+
+                //:: Current value>  1=On / 2=Standby / 3=Suspended / 4=Off / 5=OffByButton
+                MonitorSwitch(monitors[2], PowerModeEnum.PowerOn); // <<<< OK but doesn't work on laptop screen
+                //MonitorBrightness(monitors[0], 60);  // <<<< OK but doesn't work on laptop screen
+
+                PHYSICAL_MONITOR[] toDestroy = monitors.ToArray();
+                DestroyPhysicalMonitors((uint)toDestroy.Length, ref toDestroy);
+            }
+            else
+            {
+                //error
+            }
+
+        }
+
+
+
+        //Switch monitor power
+        void MonitorSwitch(PHYSICAL_MONITOR monitor, PowerModeEnum mode)
+        {
+            if (SetVCPFeature(monitor.hPhysicalMonitor, SVC_FEATURE__POWER_MODE, (uint)mode))
+            {
+                Debug.WriteLine("works!");
+            }
+            else
+            {
+                string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
+                Debug.WriteLine(errorMessage);
+            }
+        }
+
+
+        //Switch monitor power
+        void MonitorBrightness(PHYSICAL_MONITOR monitor, uint pctg)
+        {
+            if (SetVCPFeature(monitor.hPhysicalMonitor, SVC_FEATURE__Brightness, (uint)pctg))
+            {
+                Debug.WriteLine("works!");
+            }
+            else
+            {
+                string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
+                Debug.WriteLine(errorMessage);
+            }
+        }
+
+    }
+}

MonitorControl.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29424.173
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MonitorControlNetCore", "MonitorControlNetCore.csproj", "{656F438D-C75C-4FA4-A24A-04A7B611C1A1}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{656F438D-C75C-4FA4-A24A-04A7B611C1A1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{656F438D-C75C-4FA4-A24A-04A7B611C1A1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{656F438D-C75C-4FA4-A24A-04A7B611C1A1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{656F438D-C75C-4FA4-A24A-04A7B611C1A1}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {5862A0AD-D119-48E7-9671-25DBDA502B9B}
+	EndGlobalSection
+EndGlobal

MonitorControlNetCore.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <RootNamespace>MonitorControl</RootNamespace>
+    <AssemblyName>MonitorControl</AssemblyName>
+    <StartupObject>MonitorControl.App</StartupObject>
+    <PackageId>com.ricardotejo.monitor-control</PackageId>
+    <Authors>Ricardo Tejo</Authors>
+    <Company>Ricardo Tejo</Company>
+    <Product>Monitor Control</Product>
+    <Description>Brightness and power control for multiple physical monitors</Description>
+    <Copyright>©2019 Ricardo Tejo</Copyright>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <SignAssembly>false</SignAssembly>
+    <ApplicationIcon>icon.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="MonitorApi.cs" />
+  </ItemGroup>
+
+</Project>

MonitorControlNetCore.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <_LastSelectedProfileId>D:\personal\MonitorControl\Properties\PublishProfiles\FolderProfile.pubxml</_LastSelectedProfileId>
+  </PropertyGroup>
+  <ItemGroup>
+    <ApplicationDefinition Update="App.xaml">
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Update="MainWindow.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
+</Project>