Question

我有一个带有这个构造函数的类，显然它似乎不起作用。在它出现之前，我只是忘记了语法，你能不能提醒我该怎么做，拜托？

public class Excerscise
    {
        Excerscise(int t, double w, DateTime d) : tries(t), weight(w), date(d) {}
        int tries;
        double weight;
        DateTime date;
    }

Answer 1

类似的东西：

public class Excerscise {
  int tries;
  double weight;
  DateTime date;

  // it seems, that the constructor should be public
  public Excerscise(int t, double w, DateTime d) { 
    tries = t;
    weight = w;
    date = d;
  }
}

Answer 2

C＃不支持像这样的字段初始化程序语法（也许你来自C ++背景？）。这样做：

public class Exercise
{
    int tries;
    double weight;
    DateTime date;

    Exercise(int t, double w, DateTime d)
    {
        tries = t;
        weight = w;
        date = d;
    }
}

Answer 3

一个例子

class Program
    {
        class C2
        {
            int A;
            int B;
            public C2(int a, int b)
            {
                A = a;
                B = b;
            }
        }

        static void Main()
        {
            C2 c = new C2(1, 2);
        }
    }

类构造函数问题C＃

3 个答案: