c# - 如何在 C# 中的方法中调用构造函数

Question

场景是

Hide the constructor of BankAccount. And to allow construction of BankAccount, create a public static method called CreateNewAccount responsible of creating and returning new BankAccount object on request. This method will act as a factory of creating new BankAccounts.

我用过的代码是这样的

private BankAccount()
{
 ///some code here
}

//since the bank acc is protected, this method is used as a factory to create new bank accounts
public static void CreateNewAccount()
{
    Console.WriteLine("\nCreating a new bank account..");
    BankAccount();
}

但这一直在抛出错误。我不知道如何在同一个类的方法中调用构造函数

Answer 1

要使方法成为工厂，它的返回类型应该是BankAccount。在该方法中，private 构造函数可用，您可以使用它来创建新实例:

    public class BankAccount
    {
        private BankAccount()
        {
            ///some code here
        }

        public static BankAccount CreateNewAccount()
        {
            Console.WriteLine("\nCreating a new bank account..");
            BankAccount ba = new BankAccount();
            //...
            return ba;
        }
    }