自定类型转换

代码

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);
        }
    }
}