PictureBox重绘为何要使用System.Windows.Forms.PaintEventArgs e而不能直接引用名称？

pictureBox1.CreateGraphics().CompositingQuality = CompositingQuality.GammaCorrected;
pictureBox1.CreateGraphics().DrawLine(new Pen(System.Drawing.Color.FromArgb(255, 0, 0, 255)),
P,P2);