本文介绍了从基类 C# 调用子类方法的处理方法,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
是否可以从基类引用中调用子类方法?请建议...
Is it possible to call child class method from base class reference? Please suggest...
代码示例如下:
public class Parent
{
public string Property1 { get; set; }
}
public class Child1:Parent
{
public string Child1Property { get; set; }
}
public class Child2 : Parent
{
public string Child2Property { get; set; }
}
public class Program
{
public void callMe()
{
Parent p1 = new Child1();
Parent p2 = new Child2();
//here p1 & p2 have access to only base class member.
//Is it possible to call child class memeber from the base class reference based on the child class object it is referring to?
//for example...is it possible to call as below:
//p1.Child1Property = "hi";
//p2.Child1Property = "hello";
}
}
推荐答案
实际上你已经创建了一个 Child1
和 Child2
实例,所以你可以cast 给他们:
Actually you´ve created a Child1
and Child2
instances, so you can cast to them:
Parent p1 = new Child1();
Parent p2 = new Child2();
// or ((Child1) p1).Child1Property = "hi";
(p1 as Child1).Child1Property = "hi";
(p2 as Child2).Child2Property = "hello";
要检查 cast 是否成功,请测试 null
:
To check if cast successful, test for null
:
Child1 c1 = p1 as Child1;
if (c1 != null)
c1.Child1Property = "hi";
然而,更好的设计是分配给 Child1
和 Child2
局部变量
A better design, however, is assign to Child1
and Child2
local variables
Child1 p1 = Child1();
p1.Child1Property = "hi";
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