Use Win32 API

src/Extern/User32.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace SPV3.Extern
+{
+  // original code shamelessly borrowed from https://stackoverflow.com/a/744609/14894786
+  public class User32
+  {
+    [DllImport("user32.dll")]
+    public static extern bool EnumDisplaySettings(
+      string deviceName,
+      int modeNum,
+      ref DEVMODE devMode);
+    const int ENUM_CURRENT_SETTINGS  = -1;
+    const int ENUM_REGISTRY_SETTINGS = -2;
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct DEVMODE
+    {
+
+      private const int CCHDEVICENAME = 0x20;
+      private const int CCHFORMNAME = 0x20;
+      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
+      public string dmDeviceName;
+      public short dmSpecVersion;
+      public short dmDriverVersion;
+      public short dmSize;
+      public short dmDriverExtra;
+      public int dmFields;
+      public int dmPositionX;
+      public int dmPositionY;
+      public ScreenOrientation dmDisplayOrientation;
+      public int dmDisplayFixedOutput;
+      public short dmColor;
+      public short dmDuplex;
+      public short dmYResolution;
+      public short dmTTOption;
+      public short dmCollate;
+      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
+      public string dmFormName;
+      public short dmLogPixels;
+      public int dmBitsPerPel;
+      public int dmPelsWidth;
+      public int dmPelsHeight;
+      public int dmDisplayFlags;
+      public int dmDisplayFrequency;
+      public int dmICMMethod;
+      public int dmICMIntent;
+      public int dmMediaType;
+      public int dmDitherType;
+      public int dmReserved1;
+      public int dmReserved2;
+      public int dmPanningWidth;
+      public int dmPanningHeight;
+    }
+  }
+}

src/SPV3.csproj

@@ -98,6 +98,7 @@
       <DependentUpon>ControllerPreset.xaml</DependentUpon>
     </Compile>
     <Compile Include="Debug.cs" />
+    <Compile Include="Extern\User32.cs" />
     <Compile Include="Information.UserControl.xaml.cs">
       <DependentUpon>Information.UserControl.xaml</DependentUpon>
     </Compile>