C# 之抽象类

抽象类
抽象类中
    1.只包含抽象方法，
    2.包含非抽象方法和抽象方法
    3.可使用get和set访问器

Example 1:
public abstract class GeeksForGeeks { 
    public abstract void gfg();   
} 
public class Geek1 : GeeksForGeeks 
{ 
    public override void gfg() 
    { 
        Console.WriteLine("class Geek1"); 
    } 
} 
public class Geek2 : GeeksForGeeks 
{ 
    public override void gfg() 
    { 
        Console.WriteLine("class Geek2"); 
    } 
} 
Example 2: 
abstract class AbstractClass { 
    public int AddTwoNumbers(int Num1, int Num2) 
    { 
        return Num1 + Num2; 
    } 
    public abstract int MultiplyTwoNumbers(int Num1, int Num2); 
} 
class Derived : AbstractClass { 
    public override int MultiplyTwoNumbers(int Num1, int Num2) 
    { 
        return Num1 * Num2; 
    } 
} 
Example    3:
abstract class absClass { 
    protected int myNumber; 
    public abstract int numbers 
    { 
        get; 
        set; 
    } 
} 
class absDerived : absClass { 
    public override int numbers 
    { 
        get
        { 
            return myNumber; 
        } 
        set
        { 
            myNumber = value; 
        } 
    } 
} 

转自  https://www.geeksforgeeks.org/c-sharp-abstract-classes/