c# - 方法能否在运行时确定参数是否已默认？

Question

鉴于此示例代码，方法foo是否可以在运行时确定第 4 个参数是默认的？

using System;

namespace DefaultParameters {
    class Program {
        static void Main(string[] args) {
            int a = 0,b = 1,c = 3;
            foo(a, b, c);       // The 4th parm is defaulted in the method definition.
            foo(a, b, c, 100);  // The 4th parm is explicit in the method call.
        }

        /// <summary>
        /// A method with a default paramater
        /// </summary>
        /// <param name="speed">Speed</param>
        /// <param name="brightness">Brightness</param>
        /// <param name="weight">Weight</param>
        /// <param name="humidity">Humidity</param>
        public static void foo(int speed, int brightness, int weight, int humidity = 42) {
            Console.WriteLine("speed = " + speed + " brightness = " + brightness + " weight = " + weight + " humidity  = " + humidity);
        }
    }
}

标签： c#methodsoptional-parameters

Answer 1

不

您可以随意猜测，如果它是默认值，则可能没有给出，但没有办法确定。