Question

我是C＃的新手，前几天我遇到了一些代码问题，你们可能会帮助我。我在附加的代码中出错了。当你回答时，请理解它。我大学的课程名为＆＃34;基础面向对象编程＆＃34;。我的代码中出现了这个错误：

namespace Tennis_Player
{
    class Player
    {
        private string first_name;
        private string last_name;
        private DateTime dob;
        private string nat;
        private char gender;
        public Player(string first_name, string last_name, DateTime dob, string nat, char gender)
        {
            this.first_name = first_name;
            this.last_name = last_name;
            this.dob = dob;
            this.nat = nat;
            this.gender = gender;
        }
        public override string ToString() { return first_name + " " + last_name + " " +dob; }
        static void Main(string[] args)
        {
            var Niels = new Player("Niels", "Olsen", 1985 - 12 - 25, "Denmark", 'M');
            Console.WriteLine("Den nye spiller er " + Niels);
        }
    }
}

Answer 1

不以这种方式传递日期时间值。从编译器的角度来看，您正在编写数学表达式 1985-12-25 （等于1948）并尝试将该数字传递给期望该参数的DateTime的方法。

您需要声明一个DateTime变量并使用您的infos

进行初始化

static void Main(string[] args)
{
    DateTime dob = new DateTime(1985,12,25);
    var Niels = new Player("Niels", "Olsen", dob, "Denmark", 'M');
    Console.WriteLine("Den nye spiller er " + Niels);
}

当然您也可以通过电话

创建日期时间

static void Main(string[] args)
{
    var Niels = new Player("Niels", "Olsen", 
                            new DateTime(1985,12,25), 
                            "Denmark", 'M');
    Console.WriteLine("Den nye spiller er " + Niels);
}

请参阅MSDN上的DateTime structure

Answer 2

您在新Player（...）构造函数中传递的DateTime格式无效。请尝试使用此代码：

static void Main(string[] args)
{
    var dob = new DateTime(1985,12,25);
    var Niels = new Player("Niels", "Olsen", dob, "Denmark", 'M');
    Console.WriteLine("Den nye spiller er " + Niels);
}

Answer 3

通过出生日期如下

DateTime dateofbirth = new DateTime(1985,12,25);
var player= new Player("Niels", "Olsen", dateofbirth , "Denmark", 'M');
Console.WriteLine("Den nye spiller er " + player);
Console.ReadLine();

Answer 4

在您的代码中，您尚未将DateTime传递给正确的格式。请按照以下代码。

 class Player
    {
        private string first_name;
        private string last_name;
        private DateTime dob;
        private string nat;
        private char gender;
        public Player(string first_name, string last_name, DateTime dob, string nat, char gender)
        {
            this.first_name = first_name;
            this.last_name = last_name;
            this.dob = dob;
            this.nat = nat;
            this.gender = gender;
        }
        public override string ToString() { return first_name + " " + last_name + " " + dob; }
    }

    class Program
    {


        static void Main(string[] args)
        {

            var Niels = new Player("Niels", "Olsen", new DateTime(1985,04,11), "Denmark", 'M');
            Console.WriteLine("Den nye spiller er " + Niels);
        }
    }

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4 个答案: