如何在OOP中建立类似银行的账户？(How to model a banking-like account in OOP?)

 我正在使用WPF构建一个现金管理软件用于学习目的，我在为每个交易完成后能够正确建立现金账户模型时遇到一些麻烦。 
 
 这是我现在拥有的摘要版本： 
 
 帐户类： 
 
public class Account {
    public long Id { get; set; }
    public string Name { get; set; }
    public decimal StartingBalance { get; set; }
}
 
 类别类： 
 
public class Category {
    public long Id { get; set; }
    public string Name { get; set; }
}
 
 交易类： 
 
public class Transaction {
    public long Id { get; set; }
    public DateTime Date { get; set; }
    public Account Account { get; set; }
    public Category Category { get; set; }
    public string Description { get; set; }
    public decimal TransactionValue { get; set; }
}
 
 我想要实现的是，仅使用WPF绑定功能，填充数据网格并查看给定日期间隔和帐户的以下数据： 
 
Date     Account     Category     Description     Value    Balance
02/02/10 A1          C1           D1               22.30    230.00
02/03/10 A1          C1           D2              -30.00    200.00
 
 我希望能够选择“所有帐户”选项，并在余额列中查看所有帐户余额的总和。 
 
 代码工作正常，直到现在，但我没有数据网格中的Balance字段也没有看到一个优雅的方式来模拟这个，我需要你的帮助guyz！ 
 
 非常感谢您的帮助。 

I'm building a cash management software using WPF for learning purposes, and I'm having some troubles to properly model a cash account so that I can see the balance, after each transaction.
 
Here's a summarized version of what I have now:
 
An account class:
 
public class Account {
    public long Id { get; set; }
    public string Name { get; set; }
    public decimal StartingBalance { get; set; }
}
 
A category class:
 
public class Category {
    public long Id { get; set; }
    public string Name { get; set; }
}
 
A transaction class:
 
public class Transaction {
    public long Id { get; set; }
    public DateTime Date { get; set; }
    public Account Account { get; set; }
    public Category Category { get; set; }
    public string Description { get; set; }
    public decimal TransactionValue { get; set; }
}
 
What I want to achive is, using only the WPF binding capabilities, populate a datagrid and view the following data for a given date interval and account:
 
Date     Account     Category     Description     Value    Balance
02/02/10 A1          C1           D1               22.30    230.00
02/03/10 A1          C1           D2              -30.00    200.00
 
And I would like to be able to select an option "All Accounts" and see in the balance column the sum of the balance of all accounts.
 
The code is working fine until now, but I don't have the Balance field in the datagrid neither can see an elegant way to model this, I need your help guyz!
 
Thanks a lot for the help.

原文：https://stackoverflow.com/questions/4466074