C＃在foreach循环中使用点的偏移量方法来修改点的数组

Question

我在理解点的偏移量方法在foreach循环中如何修改现有点数组时遇到麻烦。我可以通过手动索引每个数组实体来做到这一点，但是我强烈怀疑那不是应该怎么做。

*编辑要清楚。将偏移点存储在MyPoints数组中的最佳方法是什么？

请参见下面的代码。我使用http://rextester.com/在线C＃编译器来测试代码。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

using System.Drawing;

namespace Rextester

{

    public class Program

    {

        static int ii = 0;

        public static void Main(string[] args)

        {

            Point[] MyPoints = 

            {

                new Point(0,0),

                new Point(10,10),

                new Point(20,0)

            };

            foreach(Point p in MyPoints)

            {

                p.Offset(5,2); //this works but does not store the new points                 

            }                  //in MyPoints array when the foreach loop 

                               //exits, which is what I want.

        Console.WriteLine("p1x = {0} \t p1y = {1}", MyPoints[0].X, MyPoints[0].Y);

        Console.WriteLine("p2x = {0} \t p2y = {1}", MyPoints[1].X, MyPoints[1].Y);

        Console.WriteLine("p3x = {0} \t p3y = {1} \n", MyPoints[2].X, MyPoints[2].Y);

        foreach(Point p in MyPoints)

        {

            MyPoints[ii].Offset(5,2);

            ii++;

        }

        Console.WriteLine("p1x = {0} \t p1y = {1}", MyPoints[0].X, MyPoints[0].Y);

        Console.WriteLine("p2x = {0} \t p2y = {1}", MyPoints[1].X, MyPoints[1].Y);

        Console.WriteLine("p3x = {0} \t p3y = {1}", MyPoints[2].X, MyPoints[2].Y);

        }

    }

}

//This yields the following

/*

p1x = 0      p1y = 0

p2x = 10     p2y = 10

p3x = 20     p3y = 0 

p1x = 5      p1y = 2

p2x = 15     p2y = 12

p3x = 25     p3y = 2*/