C#的GDI画图

//在窗体重新绘制的时候，重新加载划线
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            //创建GDI图像
            Graphics graphics = this.CreateGraphics();
            //创建画笔对象
            Pen pen = new Pen(Brushes.Red);
            //创建两个点
            Point p1 = new Point(30, 50);
            Point p2 = new Point(300, 500);
            //调用GDI方法开始画直线
            graphics.DrawLine(pen, p1, p2);
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //创建GDI图像
            Graphics graphics = this.CreateGraphics();
            //创建画笔对象
            Pen pen = new Pen(Brushes.Red);
            //创建两个点
            Point p1 = new Point(30, 50);
            Point p2 = new Point(300, 500);
            //调用GDI方法开始画直线
            graphics.DrawLine(pen, p1, p2);
        }

来源：CSDN

作者：马一林

链接：https://blog.csdn.net/qq_29760029/article/details/103983040