在多重继承中, 一个类可以具有多个父类, 并且可以从其所有父类继承功能。如下图所示, 类C继承了类A和B的功能。
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但是C#不支持多类继承。为了克服这个问题, 我们使用接口来实现多个类的继承。借助接口, 类C(如上图所示)可以获得类A和B的功能。
示例1：首先, 我们尝试继承极客1和极客2类别转换为lsbin类别, 则编译器将给出错误信息, 因为C#直接不支持多个类继承。
//C# program to illustrate
//multiple class inheritance
using System;
using System.Collections;
//Parent class 1
class Geeks1 {//Providing the implementation
//of languages() method
public void languages()
{//Creating ArrayList
ArrayList My_list = new ArrayList();
//Adding elements in the
//My_list ArrayList
My_list.Add( "C" );
My_list.Add( "C++" );
My_list.Add( "C#" );
My_list.Add( "Java" );
Console.WriteLine( "Languages provided by lsbin:" );
foreach ( var elements in My_list)
{
Console.WriteLine(elements);
}
}
}//Parent class 2
class Geeks2 {//Providing the implementation
//of courses() method
public void courses()
{//Creating ArrayList
ArrayList My_list = new ArrayList();
//Adding elements in the
//My_list ArrayList
My_list.Add( "System Design" );
My_list.Add( "Fork Python" );
My_list.Add( "Geeks Classes DSA" );
My_list.Add( "Fork Java" );
Console.WriteLine( "\nCourses provided by lsbin:" );
foreach ( var elements in My_list)
{
Console.WriteLine(elements);
}
}
}//Child class
class lsbin : Geeks1, Geeks2 {
}public class GFG {//Main method
static public void Main()
{//Creating object of lsbin class
lsbin obj = new lsbin();
obj.languages();
obj.courses();
}
}运行时错误：
prog.cs(61, 30)：错误CS1721：'lsbin'：类不能具有多个基类('Geeks1'和'Geeks2')prog.cs(35, 7)：(与先前错误相关的符号位置)但是我们可以使用接口将Geeks1和Geek2类的功能间接继承到lsbin类中。如下图所示。
//C# program to illustrate how to
//implement multiple class inheritance
//using interfaces
using System;
using System.Collections;
//Interface 1
interface GFG1 {
void languages();
}//Parent class 1
class Geeks1 : GFG1 {//Providing the implementation
//of languages() method
public void languages()
{//Creating ArrayList
ArrayList My_list = new ArrayList();
//Adding elements in the
//My_list ArrayList
My_list.Add( "C" );
My_list.Add( "C++" );
My_list.Add( "C#" );
My_list.Add( "Java" );
Console.WriteLine( "Languages provided by lsbin:" );
foreach ( var elements in My_list)
{
Console.WriteLine(elements);
}
}
}//Interface 2
interface GFG2 {
void courses();
}//Parent class 2
class Geeks2 : GFG2 {//Providing the implementation
//of courses() method
public void courses()
{//Creating ArrayList
ArrayList My_list = new ArrayList();
//Adding elements in the
//My_list ArrayList
My_list.Add( "System Design" );
My_list.Add( "Fork Python" );
My_list.Add( "Geeks Classes DSA" );
My_list.Add( "Fork Java" );
Console.WriteLine( "\nCourses provided by lsbin:" );
foreach ( var elements in My_list)
{
Console.WriteLine(elements);
}
}
}//Child class
class lsbin : GFG1, GFG2 {//Creating objects of Geeks1 and Geeks2 class
Geeks1 obj1 = new Geeks1();
Geeks2 obj2 = new Geeks2();
public void languages()
{
obj1.languages();
}public void courses()
{
obj2.courses();
}
}//Driver Class
public class GFG {//Main method
static public void Main()
{//Creating object of lsbin class
lsbin obj = new lsbin();
obj.languages();
obj.courses();
}
}【C#使用接口的多重继承详细介绍】输出如下：
Languages provided by lsbin:CC++C#JavaCourses provided by lsbin:System DesignFork PythonGeeks Classes DSAFork Java推荐阅读
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