Question

我试图仅为一个定义的元素覆盖一个虚函数（不必创建另一个实现它的类，然后添加一个函数来覆盖它。）。

示例：

public class MyClass
{
    public virtual bool ChangeStatus(String status)
    {
        return false;
    }
}


void test()
{
    //The following is written as an example of what I am trying to achieve & does not work
    MyClass blah = new MyClass()
    {
        public override bool ChangeStatus(String status)
        {
            return true;
        }
    };
}

知道如何实现这个目标吗？

感谢。

Answer 1

“虚拟”和“覆盖”都与INHERITANCE相关。

1。A virtual method can be redefined. The virtual keyword designates a method that is overridden in derived classes. We can add derived types without modifying the rest of the program. The runtime type of objects thus determines behavior.

2。When you want to allow a derived class to override a method of the base class, within the base class method must be created as virtual method and within the derived class method must be created using the keyword override.

Answer 2

C＃严格建立在类的概念之上。没有类，你不能创建一个函数/方法另外，virtual/override意味着继承，所以你必须从这个类派生。

Answer 3

如果没有override，您就无法inheriting the class，virtual function的全部内容就是overridden中的child class。

如果您正在使用同一个类，那么您最终是否会为该类编写一个简单的方法/函数？

所以，遵循OOP编程理念，它是为简单而设计的。易于编程。 Instead simply inherit the class and override the function

Answer 4

如果你可以控制MyClass，你可以让所需的方法调用一个委托，可以在运行时替换每一个对象......

class MyClass
{
    public void Func<SomeParameterType,SomeReturnType> myDelegate {get;set;}
    public SomeReturnType myFunction(SomeParameterType parameter)
    {
        if(myDelegate==null)
            throw new Exception();
        return myDelegate(parameter);
    }
}

...

MyClass obj = new MyClass();
SomeParameterType p = new SomeParameterType();
obj.myDelegate = (x)=>new SomeReturnType(x);
SomeReturnType result = obj.myFunction(p);

C＃覆盖虚函数而不必实现另一个类

4 个答案: