演示具有多级继承的接口实现的 C# 程序

多级继承是将父类扩展到一个级别中的子类的过程。在这种类型的继承中，子类将继承父类，并且子类也充当创建的其他类的父类。例如，名为 P、Q 和 R 的三个类，其中类 R 派生自类 Q，类 Q 派生自类 P。

语法：

class P : Q
{
    // Methods
}

接口指定一个类必须做什么而不是如何做。这是班级的蓝图。与类类似，接口也有方法、事件、变量等。但它只包含成员的声明。接口成员的实现将由隐式或显式实现接口的类给出。接口的主要优点是用来实现100%的抽象。

句法：

interface interface_name
{
    //Method Declaration   
}

在了解了多级继承和接口之后，现在我们用多级继承来实现接口。所以对此，我们可以将父类扩展为接口。

class GFG1 : interface1
{
    // Method definition
    public void MyMethod()
    {
        Console.WriteLine("Parent is called");
    }
}

方法

1. Create an Interface named “interface1” with method named “MyMethod”.
2. Create a parent class named ‘GFG1″ by implementing an interface.
3. Create first child class named “GFG2” by extending parent class.
4. Create second child class named ” GFG3″ by extending first child class.
5. Create an object in the main method.
6. Access the methods present in all the classes using the object.

例子：

C#

// C# program to implement interface 
// with multi-level inheritance
using System;
  
// Interface
interface interface1
{
      
    // Method Declaration
    void MyMethod();
}
  
// Parent class
class GFG1 : interface1
{
      
    // Method definition
    public void MyMethod()
    {
        Console.WriteLine("Hey! This is Parent");
    }
}
  
// First child extends parent class
class GFG2 : GFG1
{
      
    // Method definition
    public void Method1()
    {
        Console.WriteLine("Hey! This is first child");
    }
}
  
// Second child extends first child
class GFG3 : GFG2
{
      
    // Method definition
    public void Method2()
    {
        Console.WriteLine("Hey! This is second child");
    }
}
  
class Geeks{
      
public static void Main(String[] args)
{
      
    // Create an object for the second child
    GFG3 obj = new GFG3();
      
    // Call the methods of patent,
    // first and second child classes
    obj.MyMethod();
    obj.Method1();
    obj.Method2();
}
}

输出：

Hey! This is Parent
Hey! This is first child
Hey! This is second child