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EnumDisplayMonitors (user32)
 
.
Summary

C# Signature:

[DllImport("user32.dll")]
static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr lprcClip,
   EnumMonitorsDelegate lpfnEnum, IntPtr dwData);

Vb.Net Signature:

<DllImport("user32.dll")> _
Private Shared Function EnumDisplayMonitors(ByVal hdc As IntPtr, ByVal lprcClip As IntPtr, ByVal lpfnEnum As EnumMonitorsDelegate, ByVal dwData As IntPtr) As Boolean
End Function

User-Defined Types:

None.

Notes:

Please add some!

Tips & Tricks:

Please add some!

Sample Code:

    delegate bool MonitorEnumDelegate(IntPtr hMonitor, IntPtr hdcMonitor, ref Rect lprcMonitor, IntPtr dwData);

    [StructLayout(LayoutKind.Sequential)]
    public struct Rect
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
    }

    /// <summary>
    /// The struct that contains the display information
    /// </summary>
    public class DisplayInfo
    {
        public string Availability { get; set; }
        public string ScreenHeight { get; set; }
        public string ScreenWidth { get; set; }
        public Rect MonitorArea { get; set; }
        public Rect WorkArea { get; set; }
    }

    /// <summary>
    /// Collection of display information
    /// </summary>
    public class DisplayInfoCollection : List<DisplayInfo>
    {
    }

    /// <summary>
    /// Returns the number of Displays using the Win32 functions
    /// </summary>
    /// <returns>collection of Display Info</returns>
    public DisplayInfoCollection GetDisplays()
    {
    DisplayInfoCollection col = new DisplayInfoCollection();

    EnumDisplayMonitors( IntPtr.Zero, IntPtr.Zero,
        delegate (IntPtr hMonitor, IntPtr hdcMonitor, ref Rect lprcMonitor,  IntPtr dwData)
        {
        MonitorInfo mi = new MonitorInfo();
        mi.size = (uint)Marshal.SizeOf(mi);
        bool success = GetMonitorInfo(hMonitor, ref mi);
        if (success)
        {
            DisplayInfo di = new DisplayInfo();
            di.ScreenWidth = (mi.monitor.right - mi.monitor.left).ToString();
            di.ScreenHeight = (mi.monitor.bottom - mi.monitor.top).ToString();
            di.MonitorArea = mi.monitor;
            di.WorkArea = mi.work;
            di.Availability = mi.flags.ToString();
            col.Add(di);
        }
        return true;
         }, IntPtr.Zero );
     return col;
    }

Alternative Managed API:

Use System.Windows.Forms.Screen.AllScreens to get an array of all displays on the system.

Documentation

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