如何在没有表单的情况下在C＃中绘制图形

Question

I currently have a Console application. How would I draw graphics to the screen without having to have a form.

Answer 1

EDIT - based on CuddleBunny's comment, I have created a class that will basically "draw graphics on the screen."

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApplication4
{
    class test : Form
    {
        public test() : base()
        {
            this.TopMost = true;
            this.DoubleBuffered = true;
            this.ShowInTaskbar = false;
            this.FormBorderStyle = FormBorderStyle.None;
            this.WindowState = FormWindowState.Maximized;
            this.BackColor = Color.Purple;
            this.TransparencyKey = Color.Purple;
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.DrawRectangle(Pens.Black, 0, 0, 200, 200);
            this.Invalidate(); //cause repaint
        }
        public static void Main(String[] args)
        {
            Application.Run(new test());
        }
    }
}

Hope it helps.

old faulty answer

---

You can get the hwnd of another window and draw on that. I'm not sure how to draw on the entire screen though, I've always wondered that myself.

A simple example :

            Process p = Process.GetProcessById(0); //id of the process or some other method that can get the desired process
        using (Graphics g = Graphics.FromHwnd(p.MainWindowHandle))
        {
            g.DrawRectangle(Pens.Black, 0, 0, 100, 100);
        }

Answer 2

You have to create a window of some kind to draw graphics to. You can't just draw directly to the screen.

Answer 3

You can draw on the entire screen without a window using directx if you create a full screen directdrawsurface. The screen is all yours (no windows desktop at all).