访问没有对象名称和属性名称的属性？ [英] accessing properties without object name and property name ?

问题描述

通常如果我需要Accces类属性，比我用来编写objectname.properties名称（tempRecord），但是怎么来这里工作没有写objectname.properties名称

  class  TempRecord 
 {
 
  private   float  [] temps =  new   float  [ 10 ] { 56  .2F， 56  .7F， 56  .5F， 56  .9F， 58  .8F，
  61  .3F， 65  .9F ， 62  .1F， 59  .2F， 57  .5F}; 
  private   int  vps; 
 
  public   float   this  [ int  index] 
 {
  get  
 { 
  return  temps [index]; 
} 
 
  set  
 {
 temps [index] = 值; 
} 
} 
 
  public   int  mava 
 {
  set  
 {
 vps =  value ; 
} 
 获取 
 {
 返回 vps + VPS; 
} 
 
} 
} 
 
  class  MainClass 
 {
  static   void  Main（）
 {
 TempRecord tempRecord =  new  TempRecord（）; 
 tempRecord.mava =  4 ; 
  //  通常如果我需要Accces类属性，比我用来写objectname.properties名称（tempRecord） ， 
  //  但是如何在这里工作没有编写objectname.properties名称 
 tempRecord [ 3 ] =  58  .3F;  //  这里没有编写objectname.properties名称 
 tempRecord [ 5 ] =  60  .1F;  //  此处无编写objectname.properties名称 
  for （ int  i =  0 ; i <   10 ; i ++）
 {
 System.Console.WriteLine（  元素＃{0} = {1}，i，tempRecord [i]）; 
} 
 System.Console.WriteLine（ 按任意键退出。）; 
 System.Console.ReadKey（）; 
 
} 
} 

解决方案

你刚刚发现了C＃Indexers，一个句法方便，使您能够创建一个类，结构或接口，客户端应用程序可以像数组一样访问[ ^ ]。



您定义的不是'属性，它相当于：

  public   class  TempRecord：List< float> 
 {
  //  无论 
} 

索引器可以做一些有趣的事情[ ^ ]但是，imho，我不想使用它们，因为我认为许多人不熟悉这种C＃语法会使代码不那么自我记录。



如果我希望一个类行为像（它体现:)一个List，我更喜欢让类继承自List。

我很确定这是一个结果'this'允许你引用类并访问内部数组

  public   float   此  [ int  index] 
 {
  get  
 {
  return  temps [index]; 
} 
 
  set  
 {
 temps [index] = 值; 
} 
} 

请注意，我很有趣，因为我可以看到会发生什么以及它是如何工作的，我以前从未真正看过它使用



- CP显示代码标签但正确处理格式 - 奇怪 [/ edit ]

Usually If I Need Accces Class properties , Than I Used To Write objectname.properties name(tempRecord) , But How Come Here It Work's Without Writing objectname.properties name

class TempRecord
{
    
    private float[] temps = new float[10] { 56.2F, 56.7F, 56.5F, 56.9F, 58.8F, 
                                            61.3F, 65.9F, 62.1F, 59.2F, 57.5F };
    private int vps;
    
    public float this[int index]
    {
        get
        {
            return temps[index];
        }

        set
        {
            temps[index] = value;
        }
    }

    public int mava
    {
        set
        {
            vps = value;
        }
        get
        {
            return vps + vps;
        }

    }
}

class MainClass
{
    static void Main()
    {
        TempRecord tempRecord = new TempRecord();
        tempRecord.mava = 4;
        // Usually If I Need Accces Class properties , Than I Used To Write objectname.properties name(tempRecord) , 
        //But How Come Here It Work's Without Writing objectname.properties name 
        tempRecord[3] = 58.3F; // Here Without Writing objectname.properties name
        tempRecord[5] = 60.1F; // here Without Writing objectname.properties name
        for (int i = 0; i < 10; i++)
        {
            System.Console.WriteLine("Element #{0} = {1}", i, tempRecord[i]);
        }
        System.Console.WriteLine("Press any key to exit.");
        System.Console.ReadKey();

    }
}

解决方案

You have just "discovered" C# Indexers, "a syntactic convenience that enable you to create a class, struct, or interface that client applications can access just as an array" [^].

What you defined is not a 'Property, and it's equivalent to:

public class TempRecord : List<float>
{
   // whatever
}

There are some interesting things you could do with Indexers [^], but, imho, I prefer not to use them because I think the fact that many people are unfamiliar with this C# syntax makes the code less self-documenting.

If I want a Class to "behave" like (it "embodies:) a List, I prefer to have the Class inherit from List.

I'm pretty sure this is a result of the 'this' here that allows you to refer to the class and access the internal array as you do

public float this[int index]
    {
        get
        {
            return temps[index];
        }
 
        set
        {
            temps[index] = value;
        }
    }

mind you, its intriguing me because I can see what happens and how it works, Ive never actually seen it used before

[edit] - CP is displaying the code tags but handling the formatting correctly - bizarre [/edit]

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