C# 调用 WIndows API SetPixel

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public partial class Form1 : Form{
        [DllImport("Gdi32.dll ")]
        public static extern int SetPixel(IntPtr hDC, int x, int y, int color);

        public Form1(){
            InitializeComponent();
        }

        protected override void OnPaint(PaintEventArgs e) {
            base.OnPaint(e);
            IntPtr hdc = e.Graphics.GetHdc();
            for (int i = 0; i < 100; i++) {
                SetPixel(hdc, 20, 20 + i, 0);
            }
        }
    }

显示效果