在C＃中声明的对象与X，Y paramateres [英] declare object in c# with x,y paramateres

问题描述

我要创建的对象A，这将有X，Y参数。
和A必须是一个数组。什么是申报和建设这样的对象的最佳实践？例如这样的事情：

I want to create object "A" which will have x, y parameters. and A must be an array. What's best practice of declaring and constructing such object ? for example something like this:

A[0].x=5
A[0].y=3

A[1].x=6
A[1].y=4

更新
我所做的是这样的：

Update I've done this way:

    public class PersonalWaypoints
    {
        public float x { get; set; }
        public float y { get; set; }
    }
public class MainClass:MonoBehaviour
{
then in void Start() {
PersonalWaypoints[] pw = new PersonalWaypoints[waypoints.Length];

pw[0].x = waypoints[0].transform.position.x ;
pw[0].y = waypoints[0].transform.position.y ;

但，因为它不会在当前上下文存在无法使用PW中更新（）{

but then I cannot use pw in Update() { because it doesn't exist in current context.

和有它在上下文中我不能移动PersonalWaypoints [] PW =新PersonalWaypoints [waypoints.Length]类定义，因为waypoints.Length是在定义类未知的。

And to have it in context I cannot move PersonalWaypoints[] pw = new PersonalWaypoints[waypoints.Length]; to class definition because waypoints.Length is unknown while defining class.

推荐答案

您的问题有点的模糊的，如果你想要的 autoexpanding阵列式集合的，你必须有的两个的对象：一个用于点

You question is a bit vague, if you want autoexpanding array-like collection you have to have two objects: one for point

  //TODO: think over, may be you want a struct, not class
  // May be you want just a standard Point struct
  public class Item {
    public int x {get; set;}
    public int y {get; set;}
  }

和一个阵列（这是一个的索引的其实）

and one for "array" (which is an indexer in fact)

  //TODO: you may want to implement IEnumerable<Item>
  public class MyClass {
    private List<Item> m_Items = new List<Item>();

    private void Expand(int index) {
      if (index < 0) 
        throw new ArgumentOutOfRangeException("index");

      for (int i = m_Items.Count; i <= index; ++i)
        m_Items.Add(new Item());
    }

    // indexer: mimics auto expanding array
    public Item this[int index] {
      get {
        Expand(index); 

        return m_Items[index];
      }
    } 

    public int Count {
      get {
        return m_Items.Count;
      }  
    }
  }

...

  MyClass test = new MyClass();
  // test will be expanded to have 1 item: test[0]
  test[0].y = 456;
  // test will be expanded to have 6 items [0..5]
  test[5].x = 123; 

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