为什么我无法实例化它并调用“计算”​​方法？

Question

我在此页面上看到了一个问题https://www.toptal.com/c-sharp/interview-questions 试着在VS中实现它，这是我的完整代码：

 public class TopTalInterviewQuestions
 {
    //write code to calculate the circumference of the circle, without modifying the Circle class itself.
    Circle myCircle = new Circle();
    myCircle.??? // here VS does not help me        
}

public sealed class Circle
{
    //public Circle() { }
    private double radius;
    public double Calculate(Func<double, double> op)
    {
        return op(radius);
    }
}

为什么我无法实例化它并调用“计算”​​方法？ 请。为初学者解释一下。

Answer 1

在这堂课中：

public class TopTalInterviewQuestions
{
    //write code to calculate the circumference of the circle, without modifying the Circle class itself.
    Circle myCircle = new Circle();
    myCircle.??? // here VS does not help me        
}

当您编写第myCircle.???行时，您正试图将语句直接放在类声明中。你不能这样做;语句需要进入方法。

尝试这样的事情：

public class TopTalInterviewQuestions
{
    //write code to calculate the circumference of the circle, without modifying the Circle class itself.
    Circle myCircle = new Circle();
    public void MyMethod()
    {
        myCircle.???
    } 
}