自定类型转换

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

namespace ConsoleApplication1
{
    class CustomConversion
    {
        static void Main()
        {
            Rectangle r = new Rectangle(50, 50);
            Console.WriteLine(r.ToString());
            r.Draw();

            Square s = new Square(6);
            Console.WriteLine(s.ToString());
            s.Draw();

            //将矩形显示强制转换为正方形
            s =(Square)r;
            Console.WriteLine(s.ToString());
            s.Draw();

            Console.ReadLine();
        }
    }

    //矩形
    public struct Rectangle
    {
        public Rectangle(int Widht, int Heiht)
        {
            this.widht = Widht;
            this.height = Heiht;
        }

        private int widht;

        public int Widht
        {
            get { return widht; }
            set { widht = value; }
        }

        private int height;

        public int Height
        {
            get { return height; }
            set { height = value; }
        }


        public override string ToString()
        {
            return string.Format("[{0},{1}]", this.widht, this.height);
        }

        public void Draw()
        {
            for (int i = 0; i < this.height; i++)
            {
                for (int j = 0; j < this.widht; j++)
                {
                    if (i == 0 || i == this.height - 1)
                    {
                        Console.Write("-");
                    }
                    else
                    {
                        if (j == 0 || j == this.widht - 1)
                        {
                            Console.Write("|");
                        }
                        else
                        {
                            Console.Write(" ");
                        }
                    }
                }

                Console.WriteLine();
            }
        }
    }

    //正方形
    public struct Square
    {
        private float lenght;

        public float Lenght
        {
            get { return lenght; }
            set { lenght = value; }
        }

        public Square(float length)
        {
            this.lenght = length;
        }

        public void Draw()
        {
            for (int i = 0; i < this.lenght; i++)
            {
                for (int j = 0; j < this.lenght; j++)
                {
                    if (i == 0 || i == this.lenght - 1)
                    {
                        Console.Write("-");
                    }
                    else
                    {
                        if (j == 0 || j == this.lenght - 1)
                        {
                            Console.Write("|");
                        }
                        else
                        {
                            Console.Write(" ");
                        }
                    }
                }

                Console.WriteLine();
            }//end of for
        }//end of for

        //实现矩形可显示强制转换为正方形
        public static explicit operator Square(Rectangle r)
        {
            Square s;
            s.lenght = r.Height;
            return s;
        }

        public override string ToString()
        {
            return string.Format("Length:{0}",this.lenght);
        }
    }
}