不同对象的C＃数组 [英] C# array of different objects

问题描述

我有2个类B和D。我必须创建一个包含4个元素的数组，其中2个元素的类型为B，而2个元素的类型为D。我该怎么做？

  B o1 =新的B（）; 
 D o2 =新的D（）; 
 B o3 =新的B（）; 
 D o4 =新的D（）; 
  

数组应该是这样的：

  array [0] = o1; array [1] = o2; array [2] = o3; array [3] = o4; 
  

解决方案

如果除对象之外没有其他通用基类，您只需要：

  object [] array = new object [4]; 
 array [0] = o1; 
 //等
  

或一次性拍摄：

  object [] array = {o1，o2，o3，o4}; 
  

要使用特定于B或D的成员，需要在检索值时进行强制转换来自数组，例如

  B b =（B）array [0]; 
 b.SomeMethodDeclaredOnB（）; 
  

如果B和D具有 common 方法，则可以在这两个类都实现了该接口，并更改了数组的类型：

  IBD [] array = new IBD [4]; 
 array [0] = o1; 
 ... 
 array [0] .SomeMethodDeclaredInIBD（）; 
  

或：

  IBD [] array = {o1，o2，o3，o4}; 
 ... 
 array [0] .SomeMethodDeclaredInIBD（）; 
  

最后，要解决这个问题：

我是C＃的新手。我不喜欢它，但我必须学习它。在PHP中，它要容易10000倍；

我敢肯定，如果我尝试使用PHP，我会发现完全相同的体验相反的方向。不要以为C＃比PHP更糟糕或更难-只是不同而已，您一定会发现使用不熟悉的语言比舒适区语言更难。 p>

I have 2 classes B and D. I have to create an array with 4 elements 2 of type B and 2 of type D. How do I do it?

B o1 = new B();
D o2 = new D();
B o3 = new B();
D o4 = new D();

The array should be something like this:

array[0] = o1; array[1] = o2; array[2] = o3; array[3] = o4;

解决方案

If there is no common base class other than object, you just need:

object[] array = new object[4];
array[0] = o1;
// etc

Or in a single shot:

object[] array = { o1, o2, o3, o4 };

To use the members specific to B or D, you'd need to cast when you retrieved the values from the array, e.g.

B b = (B) array[0];
b.SomeMethodDeclaredOnB();

If B and D have common methods, you could declare those in an interface which both classes implemented, and change the type of the array:

IBD[] array = new IBD[4];
array[0] = o1;
...
array[0].SomeMethodDeclaredInIBD();

Or:

IBD[] array = { o1, o2, o3, o4 };
...
array[0].SomeMethodDeclaredInIBD();

Finally, to address this:

I am new to c#. I don't like it but I have to learn it. In PHP it's 10000 times easier;

I'm sure if I tried to use PHP I'd find the same experience in the exact opposite direction. Don't assume that C# is "worse" or "harder" than PHP - it's just different, and you're bound to find it harder to use a language you're not familiar with than your "comfort zone" language.

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