domain-models-2

BankAccount.cs

public class BankAccount
{
    public string Id { get; }

    public Money Balance { get; private set; }

    public BankAccount(string id, Money balance)
    {
        if(string.IsNullOrEmpty(id))
        {
            throw new ArgumentNullException(nameof(id));
        }

        this.Id = id;
        this.Balance = balance;
    }

    public void Deposit(Money depositAmount)
    {
        if(!this.Balance.HasSameCurrency(depositAmount))
        {
            throw new InvalidOperationException("Cannot deposit using different currency.")
        }

        this.Balance = this.Balance.Add(depositAmount);
    }

    public void Debit(Money debitAmount)
    {
        if (!this.Balance.HasSameCurrency(debitAmount))
        {
            throw new InvalidOperationException("Cannot debit using different currency.");
        }

        this.Balance = this.Balance.Subtract(debitAmount);
    }
}