如何访问派生类实例的属性，该派生类作为参数以基类的形式传递 [英] How to access the properties of an instance of a derived class which is passed as a parameter in the form of the base class

问题描述

在C#中，我有一个基类和一个派生类.

In C# I have a base class and a derived class.

我有一个将基类作为输入参数的函数

I have a function which has the base class as an input parameter

public void SomeFunction(BaseClass InstanceOfDerivedClass)

是否有一种方法可以访问特定于派生类的属性，即使它已经作为基类传递了呢?我可以使用GetType或Cast还是类似的东西?

Is there a way I can access the properties specific to the derived class, even though it has been passed as a base class? Could I use GetType or Cast or something like that?

我意识到解决方案可能并不完美，但目前，替代方法是针对不同的派生类多次重复执行此功能.

I appreciate that the solutions may not be elegant but at the moment the alternative is to repeat this function many times for the different derived classes.

推荐答案

您可以这样做(不好的方式):

you could do this (bad way):

public void SomeFunction(BaseClass instanceOfDerivedClass)
{
    DerivedClass derived = null;

    if(instanceOfDerivedClass is DerivedClass)
    {
        derived = instanceOfDerivedClass as DerivedClass;
        // Do stuff like :
        int prop = derived.DerivedProperty;
    }
}

或者，按照埃里克(Eric)的建议(好的方法):

Or, as suggested by Eric (good way):

public void SomeFunction(BaseClass instanceOfDerivedClass)
{
    DerivedClass derived = instanceOfDerivedClass as DerivedClass;

    if(derived != null)
    {
        // Do stuff like :
        int prop = derived.DerivedProperty;
    }
}

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