实时示例覆盖? [英] real time example overriding ?

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本文介绍了实时示例覆盖?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

任何人都可以分享覆盖的时间示例,而不使用任何虚拟课程,



例如。

公共类A

{



public int添加()

{

返回10;

}

}



公共舱B:A

{

public int添加()

{

返回11;

}

}

Main()

{

一个obj =新B();



}



在哪种情况下我们需要指向子类的对象需要绑定到基类?

can anybody share time example of overriding, without using any dummy classes,

eg.
public class A
{

public int Add()
{
return 10;
}
}

public class B:A
{
public int Add()
{
return 11;
}
}
Main()
{
A obj = new B();

}

in which scenario we need to point object of child class need to bind to base class??

推荐答案

不使用任何虚拟课程是吗? OK ...



查看标准的ToString方法:

它由对象实现 class(从中派生所有其他类)并返回一个字符串,该字符串是对象的全名。

大多数(但不是全部)派生类重写此项以提供与实际实例内容更相关的字符串: int 覆盖它以返回整数值的字符串表示形式, bool 覆盖它以返回true或false,依此类推。如果你创建自己的类,你也可以覆盖它:

"without using any dummy classes" eh? OK...

Look at the standard ToString method:
It is implemented by the object class (from which all the other classes are derived) and it returns a string which is the full name of the object.
Most (but not all) derived classes override this to provide a string that is more relevant to the actual instance content: int overrides it to return a string representation of the integer value, bool overrides it to return either "true" or "false", and so on. If you create your own class, you can also override it:
public class MyClass
    {
    public string Name { get; set; }
    public DateTime InsertDate { get; set; }
    public override string ToString()
        {
        return Name + " " + InsertDate.ToShortDateString();
        }
    }



当您在实例上调用ToString时,系统会计算出最高级别的覆盖并调用而不是默认的 object implementation。


When you call ToString on an instance, the system works out the highest level override and calls that instead of the default object implementation.


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