大话设计-模板方法模式

在基类定义算法的结构，具体实现延迟到子类。

using system;
namespace consoleapp2
{
    class program
    {
        static void main(string[] args)
        {
            testpaper testpapera = new testpapera();
            testpapera.testquestion1();
            testpapera.testquestion2();
            testpapera.testquestion3();
            testpaper testpaperb = new testpaperb();
            testpaperb.testquestion1();
            testpaperb.testquestion2();
            testpaperb.testquestion3();
        }
    }

    class testpaper
    {
        // 把骨架定义下来，只有答案不同，让子类实现具体答案。
        public void testquestion1()
        {
            console.writeline("题目1：xxxxxxyyyyxxxmmm");
            console.writeline($"题目1答案：{answer1()}");
        }
        protected virtual string answer1() { return ""; }    
                
        public void testquestion2()
        {
            console.writeline("题目2：iiipppkkkkk");
            console.writeline($"题目2答案：{answer2()}");
        }
        protected virtual string answer2() { return ""; }

        public void testquestion3()
        {
            console.writeline("题目3：uuuukkkkooo");
            console.writeline($"题目3答案：{answer3()}");
        }
        protected virtual string answer3() { return ""; }
    }

    class testpapera : testpaper
    {
        protected override string answer1()
        {
            return "a";
        }
        protected override string answer2()
        {
            return "b";
        }
        protected override string answer3()
        {
            return "c";            
        }
    }
    class testpaperb : testpaper
    {
        protected override string answer1()
        {
            return "b";
        }
        protected override string answer2()
        {
            return "c";
        }
        protected override string answer3()
        {
            return "a";
        }
    }
}

using system;
namespace consoleapp2
{
    class program
    {
        static void main(string[] args)
        {
            concreteclass concreteclass = new concreteclass();
            concreteclass.templatemethod();
        }
    }  

   abstract class abstractclass
    {
        public abstract void primitiveoperation1();
        public abstract void primitiveoperation2();
        public void templatemethod()
        {
            primitiveoperation1();
            primitiveoperation2();
            console.writeline("");
        }
    }

    class concreteclass : abstractclass
    {
        public override void primitiveoperation1()
        {
            console.writeline("具体操作1");
        }

        public override void primitiveoperation2()
        {
            console.writeline("具体操作2");
        }
    }
}