爲什麼我不能實例化它並調用「計算」​​方法？

Question

我看到這個頁面https://www.toptal.com/c-sharp/interview-questions tryed實現它在VS上的問題，這裏是我的全碼：

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); 
    } 
} 

爲什麼我不能實例並稱之爲「計算」的方法？ 請。爲初學者解釋它。

Answer 1

在這個類：

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   
} 

當你寫行myCircle.???，你要直接把聲明類聲明的內部。你不能那樣做;聲明需要進入方法。

嘗試這樣：

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.??? 
    } 
}