How to determine the screen size a computer with C#

Hi Edward , 

 

using System;
using System.Windows.Forms;

namespace YourNamespace
{
    public partial class YourForm : Form
    {
        public YourForm()
        {
            InitializeComponent();
            
            // Center the form on the screen
            CenterToScreen();
        }

        private void CenterToScreen()
        {
            // Get the screen size
            Screen screen = Screen.FromControl(this);
            int screenWidth = screen.Bounds.Width;
            int screenHeight = screen.Bounds.Height;

            // Calculate the position to center the form
            int x = (screenWidth - Width) / 2;
            int y = (screenHeight - Height) / 2;

            // Set the form position
            Location = new System.Drawing.Point(x, y);
        }

        // Rest of your form code...
    }
}
 

 In C#, you can determine the screen size of a computer using the System.Windows.Forms.Screen class. This class provides information about the display devices connected to the system. You can retrieve the screen size in pixels, working area, and other related information.

 static void Main()
    {
        // Get the primary screen's bounds (total size)
        Screen primaryScreen = Screen.PrimaryScreen;
        int screenWidth = primaryScreen.Bounds.Width;
        int screenHeight = primaryScreen.Bounds.Height;

        Console.WriteLine($"Screen Width: {screenWidth}px");
        Console.WriteLine($"Screen Height: {screenHeight}px");
    }

To determine the screen size of a computer using C#, you can utilize the System.Windows.Forms.Screen class. This class provides properties that allow you to retrieve information about the screen, including its size.

To get the screen size, you can use the Screen.PrimaryScreen.Bounds property, which returns an Rectangle object representing the dimensions of the primary screen. The Width,  Height properties of the Rectangle object will give you the horizontal and vertical measurements, respectively.

Here's an example of how you can retrieve the screen size:

using System;
using System.Windows.Forms;

class Program
{
    static void Main()
    {
        Screen primaryScreen = Screen.PrimaryScreen;
        int screenWidth = primaryScreen.Bounds.Width;
        int screenHeight = primaryScreen.Bounds.Height;

        Console.WriteLine("Screen Width: " + screenWidth);
        Console.WriteLine("Screen Height: " + screenHeight);
    }
}

In the above example, we first obtain the Screen object representing the primary screen using the Screen.PrimaryScreen property. We then access the Bounds property of the Screen object to retrieve the dimensions of the screen. Finally, we extract the width and height values from the Bounds property and display them using Console.WriteLine().

By using this approach, you can easily determine the screen size of the computer running your application and use the obtained measurements to center your forms accordingly.

There might be an easier way. You do not say whether you are using Windows Forms but the WPF and other frameworks will have features equivalent to the following.

A window has a StartPosition property.

Form.StartPosition Property
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.form.startposition?view=windowsdesktop-8.0
 

One of the possible values of that is CenterScreen.

For Horizontal and Vertical numbers.

multi-screen setup and want to get the combined size of all the screens, we can also do this with the SystemParameters class in C#. The SystemParameters.VirtualScreenHeight property gets the full height of all the monitors. The SystemParameters.VirtualScreenWidth property gets the width of all the monitors. You can use both these properties to get the combined size of all the monitors.

using System.Windows;

double height = SystemParameters.VirtualScreenHeight;
double width = SystemParameters.VirtualScreenWidth;
double resolution = height * width

Hopefully, this code will help

using System;
using System.Windows.Forms;

namespace ScreenSizeExample
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();

            // Call the method to center the form
            CenterFormOnScreen();
        }

        private void CenterFormOnScreen()
        {
            // Get the primary screen
            Screen primaryScreen = Screen.PrimaryScreen;

            // Get the screen width and height
            int screenWidth = primaryScreen.WorkingArea.Width;
            int screenHeight = primaryScreen.WorkingArea.Height;

            // Calculate the center position
            int centerX = (screenWidth - Width) / 2;
            int centerY = (screenHeight - Height) / 2;

            // Set the form's location to be centered
            Location = new System.Drawing.Point(centerX, centerY);
        }

        // Other methods and event handlers for your form...
    }
}