c#类的构造函数错误

我尝试随机化值，如果它们没有改变，但它不会让我在构造函数中使用随机化器，当我使用我的其他函数时，它会给出一个错误。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Randomizer {
    class Apartment {
        public int height;
        public int bas;
        public int hasPent;
        public Apartment(int b = 100, int h = 100, int p = 100) {
            height = h;
            bas = b;
            hasPent = p;
            public Room[,,] rooms = new Room[bas, bas, height];
            finCon(bas, height, hasPent, rooms);
        }
    
        void finCon(int b, int h, int p, Room[,,] ro) {
            Random r = new Random();
            if (b==100) {
                b = r.Next(2,4);
            }
            if (h==100) {
                h = r.Next(4,15);
            }
            if (p==100) {
                p = r.Next(0,20);
            }
        }
    }
    class Room {
        int some = 37;
    }
    class Program {
        static void Main(string[] args)
        {
            Apartment ap = new Apartment();
            ap.finCon(ap.bas,ap.height,ap.hasPent,ap.rooms);
            Console.WriteLine("{0}{1}",ap.bas,ap.height);
            }
        }
    }

错误:

(1:1)命名空间不能直接包含字段或方法等成员

(16:25)}预期

(18:13)方法必须有返回类型

(18:23)标识符期望

(18:31)标识符期望

(18:40)期望标识符

(18:47)标识符预期

(21:9)命名空间不能直接包含字段或方法等成员

(21:47)标识符期望

(21:48)标识符预期

(21:51)期望的类、委托、枚举、接口或结构

(22:28)期望的类、委托、枚举、接口或结构

(33:5)类型或命名空间定义，或文件结束

(46:1)类型或命名空间定义，或文件结束

namespace Randomizer
{
    public class Apartment
    {
        public int height;
        public int bas;
        public int hasPent;
        public Room[,,] rooms;
        public Apartment(int b = 100, int h = 100, int p = 100)
        {
            height = h;
            bas = b;
            hasPent = p;
            rooms = new Room[bas, bas, height];
            finCon(bas, height, hasPent, rooms);
        }
        public void finCon(int b, int h, int p, Room[,,] ro)
        {
            Random r = new Random();
            if (b == 100)
            {
                b = r.Next(2, 4);
            }
            if (h == 100)
            {
                h = r.Next(4, 15);
            }
            if (p == 100)
            {
                p = r.Next(0, 20);
            }
        }
    }
    public class Room
    {
        int some = 37;
    }
    class Program
    {
        static void Main(string[] args)
        {
            Apartment ap = new Apartment();
            ap.finCon(ap.bas, ap.height, ap.hasPent, ap.rooms);
            Console.WriteLine("{0}{1}", ap.bas, ap.height);
        }
    }
}