添加系统，绘制，点

我遇到了下面的代码，使用System.Drawing.Size类的构造函数来添加两个System.Drawing.Point对象。

// System.Drawing.Point mpWF contains window-based mouse coordinates
// extracted from LParam of WM_MOUSEMOVE message.
// Get screen origin coordinates for WPF window by passing in a null Point.
System.Windows.Point originWpf = _window.PointToScreen(new System.Windows.Point());
// Convert WPF doubles to WinForms ints.
System.Drawing.Point originWF = new System.Drawing.Point(Convert.ToInt32(originWpf.X),
    Convert.ToInt32(originWpf.Y));
// Add WPF window origin to the mousepoint to get screen coordinates.
mpWF = originWF + new Size(mpWF);

我认为在最后一个语句中使用+ new Size(mpWF)是一个hack，因为当我阅读上面的代码时，它减慢了我的速度，因为我没有立即理解发生了什么。

我试着将最后一句话解构如下:

System.Drawing.Point tempWF = (System.Drawing.Point)new Size(mpWF);
mpWF = originWF + tempWF;  // Error: Addition of two Points not allowed.

但是它不起作用，因为两个System.Drawing.Point对象没有定义加法。是否有其他的方法来执行两个Point对象的加法比原始代码更直观?

public static class ExtensionMethods
{
    public static Point Add(this Point operand1, Point operand2)
    {
        return new Point(operand1.X + operand2.X, operand1.Y + operand2.Y);
    }
}

 var p1 = new Point(1, 1);
 var p2 = new Point(2, 2);
 var reult =p1.Add(p2);