对象数组传递作为参数，请求对象的实例？ [重复]

Question

这个问题已经在这里有一个答案：

What is a NullReferenceException, and how do I fix it? 31个回答

我使用下面的方法传递名为“客户”的对象的方法。我先前已实例customerArray作为主空对象。

Main

Customer[] customerArray = new Customer[] { };

Passed Array

customerArray = Methods.NewAccount(customerArray);

说我遇到的问题是在方法内部。我收到没有语法错误，但我得到一个错误代码，说明Object reference not set to an instance of an object。

Method

public static Customer[] NewAccount(Customer [] createdCustomers)
{
    if (createdCustomers == null)
    {
        Console.Clear();
        Console.WriteLine("You must first enter a new customer. Press any key to continue...");
        Console.ReadKey();
        Methods.NewCustomer();
    }
    else
    {
        for (int i = 0; i < createdCustomers.Length; i++)
        {
            Console.Clear();
            Console.WriteLine($"Please enter the Account Balance for {createdCustomers[i].CustomerName}.");
            string accountBalanceStr = Console.ReadLine();
            decimal accountBalanceDec;
            while (!decimal.TryParse(accountBalanceStr, out accountBalanceDec))
            {
                Console.Clear();
                Console.WriteLine($"INVALID RESPONSE


" +
                    $"Please enter the Account Balance for {createdCustomers[i].CustomerName}.");
                accountBalanceStr = Console.ReadLine();
            }
            createdCustomers[i].CustomerAccount.AccountBalance = accountBalanceDec;

            Console.Clear();
            Console.WriteLine($"Please enter the Account Number for {createdCustomers[i].CustomerName}.");
            string accountNumberStr = Console.ReadLine();
            int accountNumberInt;
            while (!int.TryParse(accountNumberStr, out accountNumberInt))
            {
                Console.Clear();
                Console.WriteLine($"INVALID RESPONSE


" +
                    $"Please enter the Account Number for {createdCustomers[i].CustomerName}.");
                accountBalanceStr = Console.ReadLine();
            }
            createdCustomers[i].CustomerAccount.AccountNumber = accountNumberInt;
        }

    }

    return createdCustomers;
}

我试图改变物体本身内的值，并将其传递回主。每当我进入我的信息，它踢回来的错误。我不能完全肯定这是怎么回事。

我相信我的问题是数据是如何被处理的。我也尝试实例化一个新的对象，但不会做任何我好，因为我需要从之前创建的对象的所有数据。

Errors on Line

createdCustomers[i].CustomerAccount.AccountBalance = accountBalanceDec

Customer Object

class Customer
    {
        public string CustomerName { get; set; }

        public CheckingAccount CustomerAccount { get; set; }

        public Customer(string _customerName, CheckingAccount _customerAccount)
        {
            CustomerName = _customerName;
            CustomerAccount = _customerAccount;
        }
    }

Checking Account Object

class CheckingAccount
    {
        public decimal AccountBalance {get; set;}
        public int AccountNumber { get; set; }

        public CheckingAccount(decimal _accountBalance, int _accountNumber)
        {
            AccountBalance = _accountBalance;
            AccountNumber = _accountNumber;
        }
    }

Created Customer

public static Customer [] NewCustomer()
        {
            Console.Clear();
            Console.WriteLine("How many customers will you be creating? ");
            string createdCustomersStr = Console.ReadLine();
            int createdCustomersInt;
            while(!Int32.TryParse(createdCustomersStr, out createdCustomersInt))
            {
                Console.Clear();
                Console.WriteLine("That is an invalid number, please enter the number of customers to create.");
                createdCustomersStr = Console.ReadLine();
            }
            Customer[] createdCustomer = new Customer [createdCustomersInt];
            for (int i = 0; i < createdCustomersInt; i++)
            {
                Console.Clear();
                Console.WriteLine($"Please input customer #{i+1}'s name. ");
                string createdNameStr = Console.ReadLine();
                Customer createdCustomerTemp = new Customer(createdNameStr, null);
                createdCustomer[i] = createdCustomerTemp;
            }
            return createdCustomer;

有些我回顾了没有帮助：

What is a NullReferenceException, and how do I fix it?

What does "Object reference not set to an instance of an object" mean?

这些页面简单地说是什么原因造成的错误，但只能在低层次手段。我使用数组和方法，通过这些阵列。我无法理解的是方法处理数组和对象如何需要实例化这样的方式。这个问题是不知道是什么原因造成的错误，这是“确定”不是一个简单的裁判错误更复杂的事情。

Answer 1

另一答案