返回simplify as null

Question

所以，首先，我是一个初学者，在学校有6个月的C#经验。我可以用另一种方法来做，但是我想知道更多的方法。我需要这方面的帮助。发生的情况是，当我运行程序时，一切都很正常，直到private void Add()，出现了一些错误，并告诉Simplify is null？提前谢谢。

using System;

namespace test1
{
 class Details
 {
    int NumberSimplify;
    double Solution;

    private void Ask()
    {
        Console.Write("Would you like to Add or Substract (1 - Add, 2 - Substract) -► ");
        int Opt = int.Parse(Console.ReadLine());

        switch(Opt)
        {
            case 1:
                Console.Write("\nHow many numbers would you like to add? -► ");
                NumberSimplify = int.Parse(Console.ReadLine());                    
                break;

            case 2:
                break;
        }
    }

    public void DisplayResult(double[] Simplify)
    {
        Console.Write("Result from Addition -► ", Add(Simplify));
    }

    private void AddDetails()
    {
        Ask();
        double[] Simplify = new double[NumberSimplify];
        Console.WriteLine();
        for (int i = 0; i < Simplify.Length; i++)
        {
            Console.Write("Number {0} -► ", i + 1);
            Simplify[i] = double.Parse(Console.ReadLine());
        }
    }



    private double Add(double[] Simplify)
    {
        AddDetails();
        for (int i = 0; i < Simplify.Length; i++)
        {
            Solution = Simplify[i] + Simplify[i + 1];
        }
        return Solution;
    }


}


class Execute
{
    public static double[] Simplify { get; private set; }

    static void Main(string[] args)
    {

        Details AddOrSub = new Details();
        AddOrSub.DisplayResult(Simplify);
        Console.ReadLine();

    }
}

}

Answer 1

Simplify确实是空的.

public static double[] Simplify { get; private set; } 

你需要初始化数组...所以这应该更像是；

public static double[] Simplify { get; private set; } = new double[someNumberOfElements]

但是正如注释中所指出的，您甚至没有使用该变量的这个初始版本(它在您的下一个方法中无论如何都会被覆盖)，所以请考虑完全删除它并重新访问您的控制流……