以下继承有什么区别

发布于 2024-12-21 08:03:24 字数 847 浏览 1 评论 0原文

这是简单的继承

public class BaseClass
{
    public string Draw()
    {
        return "Draw from BaseClass";
    }
}

public class ChildClass:BaseClass
{
    public string Draw()
    {
        return "Draw from ChildClass";
    }
}

static void Main(string[] args)
{
   ChildClass c = new ChildClass();
   console.writeline(c.Draw());
}

上面的实现将打印 Draw from Childclass

这是重写的用法

public class BaseClass
{
    public virtual string Draw()
    {
        return "Draw from BaseClass";
    }
}

public class ChildClass:BaseClass
{
    public override string Draw()
    {
        return "Draw from ChildClass";
    }
}

static void Main(string[] args)
{
   ChildClass c = new ChildClass();
   console.writeline(c.Draw());
}

上面的实现将打印 Draw from Childclass

那么上面2种继承实现有什么区别呢。

原文

Here is the simple inheritance

public class BaseClass
{
    public string Draw()
    {
        return "Draw from BaseClass";
    }
}

public class ChildClass:BaseClass
{
    public string Draw()
    {
        return "Draw from ChildClass";
    }
}

static void Main(string[] args)
{
   ChildClass c = new ChildClass();
   console.writeline(c.Draw());
}

The above implementation will print
Draw from Childclass

Here is the usage with the override

public class BaseClass
{
    public virtual string Draw()
    {
        return "Draw from BaseClass";
    }
}

public class ChildClass:BaseClass
{
    public override string Draw()
    {
        return "Draw from ChildClass";
    }
}

static void Main(string[] args)
{
   ChildClass c = new ChildClass();
   console.writeline(c.Draw());
}

The above implementation will print
Draw from Childclass

So what is the difference between above 2 Inheritance Implementation.

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俯瞰星空 2024-12-28 08:03:24

在第二个片段中，Draw 被声明为虚拟的，这意味着您可以从 BaseClass 类型的变量调用继承的方法。

BaseClass b = new ChildClass ();

b.Draw () // will call ChildClass.Draw

文档

有趣的事情..上面列表中的第二个链接使用与您提供的相同的片段。

In the second snippet Draw is declared to be virtual, this means that you can call the inherited method from a variable of type BaseClass.

BaseClass b = new ChildClass ();

b.Draw () // will call ChildClass.Draw

Documentation

Funny thing.. the second link in the list above uses the same snippets as you've provided.

回复收藏 0 原文

红ご颜醉 2024-12-28 08:03:24

在第一个实现中，如果从 BaseClass 内部调用 Draw()，输出将为“Draw from Base Class”。但在第二个实现中它将是“从子类中绘制”。这是一个解释：
http://weblogs.sqlteam.com/mladenp/archive/2007 /04/09/60168.aspx

回复收藏 0 原文

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