如何在C#中基于层次结构接口初始化对象

public interface IShape
{
    void Draw();
}

public interface ICircle : IShape
{
    void SetRadius(double radius);
}

public interface ISquare : IShape
{
    void SetSideLength(double length);
}

public class Circle : ICircle
{
    private double radius;

    public void SetRadius(double radius)
    {
        this.radius = radius;
    }

    public void Draw()
    {
        Console.WriteLine("Drawing a circle with radius: " + radius);
    }
}

public class Square : ISquare
{
    private double sideLength;

    public void SetSideLength(double length)
    {
        this.sideLength = length;
    }

    public void Draw()
    {
        Console.WriteLine("Drawing a square with side length: " + sideLength);
    }
}

IShape shape1 = new Circle();
shape1.Draw();

IShape shape2 = new Square();
shape2.Draw();