Question

我一直在研究这个问题几个小时，但却找不到输出任何内容的原因。没有指出错误，所以它在实际代码中。有人可以看看这个，可能会抓到我没看到的东西吗？谢谢！

namespace ConsoleApplication8
{
    class Tape
    {
        public Tape(int length, int width)
        {
            len = length;
            wid = width;
        }
        public int len { get; set; }
        public int wid { get; set; }

        public override string ToString()
        {
            return string.Format("{0}\nLength: {1}\nWidth: {2}", GetType(), len, wid);
        }
    }

    class VideoTape : Tape
    {
        public int PlayTime { get; set; }
        public VideoTape(int length, int width, int playTime)
            : base(len, wid)
        {
            PlayTime = playTime;
        }
        public override string ToString()
        {
            return string.Format("{0}\nPlay Time: {1}", base.ToString(), PlayTime);
        }
    }
    class AdhesiveTape : Tape
    {
        private int _stickiness;
        public AdhesiveTape(int length, int width, int stickiness)
            : base(length, width)
        {
            Stickiness = stickiness;
        }
        public int Stickiness
        {
            get { return _stickiness; }
            set
            {
                if (value >= 1 && value <= 10)
                    _stickiness = value;
                else
                    _stickiness = 0;
            }
        }
        public override string ToString()
        {
            return string.Format("{0}\nStickiness: {1}",
                base.ToString(), (Stickiness == 0) ? "Invalid Input" : Stickiness.ToString());
        }
    }

    class Test
    {
        static void Main(string[] args)
        {
            var tape = new Tape(100, 10);
            var videoTape = new VideoTape(50, 5, 200);
            var adhesiveTape = new AdhesiveTape(500, 8, 8);

            Console.WriteLine(tape);
            Console.WriteLine(videoTape);
            Console.WriteLine(adhesiveTape);

            Console.ReadLine();
        }
    }
}

Answer 1

如前所述，在VideoTape类型的构造函数中调用基础构造函数时存在参数传递问题，以下代码对我来说很好：

    using System;
    namespace ConsoleApplication8
    {
        class Tape
        {
            public Tape(int length, int width)
            {
                len = length;
                wid = width;
            }
            public int len { get; set; }
            public int wid { get; set; }

            public override string ToString()
            {
                return string.Format("{0}\nLength: {1}\nWidth: {2}", GetType(), len, wid);
            }
        }

        class VideoTape : Tape
        {
            public int PlayTime { get; set; }
            public VideoTape(int length, int width, int playTime)
                : base(length, width)
            {
                PlayTime = playTime;
            }
            public override string ToString()
            {
                return string.Format("{0}\nPlay Time: {1}", base.ToString(), PlayTime);
            }
        }
        class AdhesiveTape : Tape
        {
            private int _stickiness;
            public AdhesiveTape(int length, int width, int stickiness)
                : base(length, width)
            {
                Stickiness = stickiness;
            }
            public int Stickiness
            {
                get { return _stickiness; }
                set
                {
                    if (value >= 1 && value <= 10)
                        _stickiness = value;
                    else
                        _stickiness = 0;
                }
            }
            public override string ToString()
            {
                return string.Format("{0}\nStickiness: {1}",
                    base.ToString(), (Stickiness == 0) ? "Invalid Input" : Stickiness.ToString());
            }
        }

        class Test
        {
            static void Main(string[] args)
            {
                var tape = new Tape(100, 10);
                var videoTape = new VideoTape(50, 5, 200);
                var adhesiveTape = new AdhesiveTape(500, 8, 8);

                Console.WriteLine(tape);
                Console.WriteLine(videoTape);
                Console.WriteLine(adhesiveTape);

                Console.ReadLine();
            }
        }
    }

已更改：

    public VideoTape(int length, int width, int playTime)
            : base(len, wid)

要：

    public VideoTape(int length, int width, int playTime)
            : base(length, width)

len和wid不是VideoTape构造函数的参数，因此无法传递给基础构造函数

这是一个.net小提琴，你可以看到它在运行并玩弄它： https://dotnetfiddle.net/YZUC4O

在C＃代码上需要第二套眼睛

1 个答案: