C# lambda表达式 =＞

属性

using System;

namespace StructsSample
{
    public struct Dimensions
    {
        public double Length { get;  }
        public double Width { get; }

        public Dimensions(double length, double width)
        {
            Length = length;
            Width = width;
        }

        public double Diagonal => Math.Sqrt(Length * Length + Width * Width);
       //使用lambda表达式时，Diagonal是属性
    }
}

使用lambda表达式时，Diagonal是属性 ，可以用point.Diagonal的形式直接使用Diagonal的值

namespace StructsSample
{
    class Program
    {
        static void Main()
        {
            var point = new Dimensions(3, 6);
           Console.WriteLine(point.Diagonal);//属性
          //  Console.WriteLine(point.Diagonal());//方法
            Console.ReadLine();
        }
    }
}

方法

using System;

namespace StructsSample
{
    public struct Dimensions
    {
        public double Length { get;  }
        public double Width { get; }

        public Dimensions(double length, double width)
        {
            Length = length;
            Width = width;
        }

       // public double Diagonal => Math.Sqrt(Length * Length + Width * Width);
        public double Diagonal() //方法
        {
            double a;
            a= Math.Sqrt(Length * Length + Width * Width);
            return a;
        }
    }
}

public double Diagonal() 作为方法，调用point.Diagonal()值时要加上（）

namespace StructsSample
{
    class Program
    {
        static void Main()
        {
            var point = new Dimensions(3, 6);
            //Console.WriteLine(point.Diagonal);
            Console.WriteLine(point.Diagonal());
            Console.ReadLine();
        }
    }
}