如何在这里传递 Func

Question

假设我有一个 class 如下所示。

public class Circle
{
    private double radius;
    public double GetArea(Func<double, double> operand)
    {
        return operand(radius);
    }
}

我不确定如何在运行时传递 Func 来进行所需的计算

Answer 1

var area = circle.GetArea((r) => 2 * Math.PI * r * r);

好像有点傻，何乐而不为

public class Circle
{
    public Circle(double radius) { Radius = radius; }
    public double Radius { get; private set; }
    public double Area {
      get {
         return 2 * Math.PI * Radius * Radius;
      }
    }
 }

Answer 2

我希望答案是不言自明的：

Func<double, double> multiply = (r)=>r*r;

double area = GetArea(multiply, radius);

public double GetArea( Func<double, double> operand , double rad )
{
    return operand( rad );
}

如何在这里传递 Func

How to pass a Func here

c#

func