问题描述
运行时多态性和编译时多态性有什么区别?另外，早期绑定和后期绑定有什么区别?示例将不胜感激.
What's the difference between run-time polymorphism and compile-time polymorphism? Also, what's the difference between early binding and late binding? Examples would be highly appreciated.
推荐答案
编译时多态
方法重载就是一个很好的例子.您可以有两个具有相同名称但具有不同签名的方法.编译器会在编译时选择正确的版本.
Method overloading is a great example. You can have two methods with the same name but with different signatures. The compiler will choose the correct version to use at compile time.
运行时多态性
在子类中覆盖父类的虚方法就是一个很好的例子.另一个是从接口实现方法的类.这允许您在使用子指定的实现时在代码中使用更通用的类型.给定以下类定义:
Overriding a virtual method from a parent class in a child class is a good example. Another is a class implementing methods from an Interface. This allows you to use the more generic type in code while using the implementation specified by the child. Given the following class definitions:
public class Parent
{
public virtual void SayHello() { Console.WriteLine("Hello World!"); }
}
public class Child : Parent
{
public override void SayHello() { Console.WriteLine("Goodbye World!"); }
}
以下代码将输出再见世界！":
The following code will output "Goodbye World!":
Parent instance = new Child();
instance.SayHello();
早期绑定
在编译时指定类型:
SqlConnection conn = new SqlConnection();
后期装订
类型在运行时确定:
object conn = Activator.CreateInstance("System.Data.SqlClient.SqlConnection");
这篇关于C# 多态性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！