c#分配引用

Question

我对 class 的 Lab 有疑问，问题是我不确定如何分配我的引用。

这是我的代码:

class Bank
{
    static List<Account> accounts = new List<Account>();
    static Account active_account; // this will be an active 
    // Account (reference) retrieved from 
    // the bank. This will need to initialised either by 
    // CreateAccount or by RetrieveAccount.

    static void Main()
    {
        bool running = true, valid_option = false;
        int user_option = 0, account_num = 0, account_pin = 0;
        string name = "", type = "";
        decimal balance = 0, credit = 0;
        Bank chosen = new Bank();

        Console.Write("account number:");
                    account_num = SafeReadInteger(0);
                    Console.Write("pin number:");
                    account_pin = SafeReadInteger(0);
                    Console.Write("Client name:");
                    name = Console.ReadLine();
                    Console.Write("Balance:");
                    balance = SafeReadDecimal(0);
                    Console.Write("type:");
                    type = Console.ReadLine();
                    Console.Write("Credit:");
                    credit = SafeReadDecimal(0);
        chosen.CreateAccount(account_num, account_pin, name, balance, type);
    }
}

评论来自讲师，

现在向下滚动到我的构造函数，

public Account CreateAccount(int ac_num_, int pin_, string owner_, decimal balance_, string type)
{
    Account newAcc = null;

    newAcc = new Account(ac_num_, pin_, owner_, balance_, type); // first uses the         constructor to create an account
    accounts.Add(newAcc); // second it inserts the account in the list and return the       reference to the account
    // depending on the type of account, a credit limit is set
    active_account = new Account(ac_num_, pin_);
    return newAcc;
}

我的问题是我在哪里初始化 active_account 以及我将它分配给什么？

Answer 1

您的 CreateAccount 方法不是构造函数。它是一种工厂方法。它是这样工作的:

active_account = chosen.CreateAccount(
    account_num, account_pin, name, balance, type);

active_account.DoStuff();

您的 Bank 实例有一个名为 CreateAccount 的工厂方法，它返回一个 Account 类的初始化实例。