class Program
    {
        static void Main(string[] args)
        {
            Adaptee ada = new Adaptee();
            Target tar = ada;
        }
    }

    public class Adaptee
    {
        public int code = 1;
    }
    public class Target
    {
        private int data;
        public Target(int
 
 data)
        {
            this.data = data;
        }
        //可以進行隱式轉換
        public static implicit  operator Target (Adaptee ada)
        {
            return new Target(ada.code);
        }
    }

顯式轉換

  class Program
    {
        static void Main(string[] args)
        {
            Adaptee ada 
 
= new Adaptee();
            Target tar = (Target)ada;
        }
    }

    public class Adaptee
    {
        public int code = 1;
    }
    public class Target
    {
        private int data;
        public Target(int data)
        {
            this.data = data;
        }
        //必須顯示轉換
        public
 
 static explicit  operator Target (Adaptee ada)
        {
            return new Target(ada.code);
        }
    }

C# 關鍵字explicit（顯示），implicit（隱式），類型的隱式和顯式轉換