C# 使用派生类对象访问基类方法

Access the base class method with derived class objects

提问by 3692

If I am using shadowing and if I want to access base class method with derived class objects, how can I access it?

如果我正在使用阴影并且我想使用派生类对象访问基类方法，我该如何访问它？

采纳答案by 3692

First cast the derived class object to base class type and if you call method it invokes base class method. Keep in mind it works only when derived class method is shadowed.

首先将派生类对象转换为基类类型，如果您调用方法，它会调用基类方法。请记住，它仅在派生类方法被隐藏时才起作用。

For Example,

例如，

Observe the commented lines below:

观察下面的注释行：

public class BaseClass
{
    public void Method1()
    {
        string a = "Base method";
    }
}

public class DerivedClass : BaseClass
{
    public new void Method1()
    {
        string a = "Derived Method";
    }
}

public class TestApp
{
    public static void main()
    {
        DerivedClass derivedObj = new DerivedClass();
        BaseClass obj2 = (BaseClass)derivedObj; // cast to base class
        obj2.Method1();  // invokes Baseclass method
    }
}

回答by Luchian Grigore

You qualify the method call:

您限定方法调用：

base.foo();

回答by Oded

Use the basekeyword:

使用base关键字：

base.MethodOnBaseClass();

The basekeyword is used to access members of the base class from within a derived class:

所述碱关键字用于基类的成员访问从派生类内：

回答by Ganesh Pandey

DerivedClass derivedObj = new DerivedClass(); 
(derivedObj as BaseClass).Method1(); // cast to base class with method invoke