C# 之抽象类

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

Example :
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 :
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    :
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/