如何在C＃中的现有基础类中添加内容？ [英] How to add stuff into existing base class in C#?

问题描述

说我有一个教父类要由Children类继承，后来我想在不修改原始教父类的情况下向教父类添加更多内容，请教我该怎么做。

让我澄清我的问题。所有儿童班的父亲都会自动使用任何贵重物品和方法，对吗？例如：

 公共类父亲
 {
 public int a; 
 public int b; 
 public int c（）
 {
 return a + b; 
} 
} 
 
公共班级子女：父亲
 {
 private int d = a * b + c（）; 
} 
  

现在我想向父亲添加一个布尔值e和一个方法f（）这样我的孩子就可以直接访问它，而无需在父亲中直接添加这些行或在父亲与孩子之间建立新的类。那可能吗？我该怎么办？

解决方案

如果您想向父模型添加更多字段，则可能应该更改继承结构。

例如，您有模型A和模型B。模型B继承了模型A的字段

 公共类A 
 {
公共字符串FieldA {get;组; } 
} 
 
公共类B：A 
 {
公共字符串FieldB {get;组; } 
} 
  

这样，类B具有字段 FieldA 和 FieldB 。

现在，如果您想让类B继承自一个具有A的字段，但是您可以像这样在继承树中添加另一层。

 公共类A 
 {
公用字串FieldA {取得；组; } 
} 
 
公用类别C：A 
 {
公用字串FieldC {取得；组; } 
} 
 
公共类B：C 
 {
公共字符串FieldB {get;组; } 
} 
  

现在，您的班级B具有字段 FieldA 和 FieldB 和 FieldC ，您不必更改原始的父类A。 / p>

现在，如果要扩展类的方法，还可以使用静态扩展，例如：

 公共静态无效值DoSomething（this A a）
 {
 ... 
} 
  

然后调用 A.DoSomething（）;

Say I have a Father class to be inherited by Children classes, later I want to add more stuff into the Father class without modifying the original Father class, please teach me how could I do it.

Let me clarify my question. Any valuables and methods in Father will automatically accessible to all the Children classes, right? For example:

public class Father
{
    public int a;
    public int b;
    public int c()
    {
        return a+b;
    }
}

public class Child : Father
{
    private int d=a*b+c();
}

Now I want to add a boolean e and a method f() to Father so my Child could access it directly, without adding those lines directly in Father or make a new class in between Father and Child. Is that possible? How could I do it?

解决方案

If you want to add more fields to your father model then maybe your inheritance structure should be changed.

For example you had model A and model B. Model B inherited fields from model A

public class A
{
    public string FieldA { get; set; }
}

public class B : A
{
    public string FieldB { get; set; }
}

This way the class B has fields FieldA and FieldB.

Now if you want your class B to inherit from a class that has the fields of A but more you could add another layer to your inheritance tree like this.

public class A
{
    public string FieldA { get; set; }
}

public class C : A
{
    public string FieldC { get; set; }
}

public class B : C
{
    public string FieldB { get; set; }
}

Now your class B has fields FieldA and FieldB and FieldC and you don't have to alter your original father class A.

Now if you want to extend methods for a class you could also go with static extensions like this:

Public static void DoSomething(this A a)
{
    ... 
} 

and then call A.DoSomething();

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