使用字符串绘制空心正方形和三角形的形状

Question

//调用函数时，三次出现“无法绘制形状”的错误 //在if和for循环中应该改变什么，以便当高度或宽度小于1时，它应该说“不能绘制形状”。 你可以在代码中看到，当高度为1，宽度为5时，显示“无法绘制”。

这是我在C＃中的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class ShapeDrawer {
    public static string DrawSquare(int height, int width) {

//在这里绘制正方形的代码

        string s = "";
        string wrong = "Cannot draw that shape.";

//条件如果宽度和高度小于1则应打印无法绘制

    }if (width < 1 || height < 1) {
            return wrong;
        } else {
            //nested for loops to check the condition
            for (int i = 1; i <= height; i++)  {
                for (int j = 1; j <= width; j++) {
                    if (i == 1 | j == 1 || i == height || j == width) {
                        if (width <= 1 || height <= 1) {
                            s = s + "Cannot draw that shape.";
                        } else {
                            //print asterisk if condition is true
                            s = s + "*";
                        }
                    } else {
                        s = s + " ";
                    }
                }
                s = s + "\n";
            }

            return s;
        }

//打印等腰三角形

    public static string DrawIsoscelesTriangle(int size) {
        //code to draw the triangle
        string s = "";
        string wrong = "Cannot draw that shape.";

        for (int i = 1; i <= size; i++) {
            for (int j = 1; j <= i; j++) {
                s = s + "*";
            }
            s = s + "\n";
        }
        for (int i = size - 1; i >= 1; i--){
            for (int j = 1; j <= i; j++){
                s = s + "*";
            }
            s = s + "\n";
        }

//如果三角形的大小小于2则打印无法绘制

        if (size < 2) {
            return wrong;
        } else {
            return s;
        }
    }
}


class Program {

//主要调用函数

    static void Main() {

//带高度和宽度的方形输入

        Console.WriteLine(ShapeDrawer.DrawSquare(1, 5));

//方形的输入，大小为2

        Console.WriteLine(ShapeDrawer.DrawIsoscelesTriangle(2));
        Console.WriteLine("\n\n Hit Enter to exit.");
        Console.ReadLine();
    }
}