如何检查对象是否改变？ [英] How to check if an object has changed?

问题描述

我有一个对象，其中包含其它的目的，其中含有其它的目的，包括列表，等等。这个对象数据绑定到一个形式，揭露众多领域在不同的选项卡用户。
我也用主的孩子datagridviews。

I have an object, which contains other objects, which contain other objects, including lists, etcetera. This object is databound to a form, exposing numerous fields to the user in different tabs. I also use master-child datagridviews.

不知道如何检查，如果任何事情对象已改变相对于先前的时刻吗？无（手动）加入改变的变量，它被设置为true在所有（> 100）set方法。

Any idea how to check if anything has changed in this object with respect to an earlier moment? Without (manually) adding a changed variable, which is set to true in all (>100) set methods.

推荐答案

怎么办你定义的平等（介于新旧状态）？

How do you define "equality" (between old and new state)?

• 您比较的属性只或字段呢？


• 您只比较公开属性/字段？


• 请你曾经的忽略的任何属性/字段（即他们的修改并不重要）？


• 你如何比较原子类型（例如都是字符串比较不区分大小写的，或者你需要区分大小写的，有些地方为好）。

• Are you comparing properties only or fields as well?
• Are you only comparing public properties/fields?
• Do you ever ignore any properties/fields (i.e. their modifications do not matter)?
• How do you compare "atomic" types (e.g. are all string comparisons case-insensitive, or you need case-sensitive in some places as well).

如果这些问题的答案足够一般（即你可以设计出适用于所有对象的一组规则），那么你理论上可以达到你想要的东西通过的反射：基本思路是读取所有属性/根对象的字段，然后存放原子的人，并递归陷入了非原子那些（和重复整个过程）。后来，当您要检查如果有什么变化，你会重复递归下降，并与存储的值的比较结果。

If answers to these questions are general enough (i.e. you can devise a set of rules that apply to all of your objects), then you could theoretically accomplish what you want through reflection: The basic idea is to read all properties/fields of the "root" object, then store the "atomic" ones and recursively descend into the "non-atomic" ones (and repeat the whole process). Later, when you want to check if anything changed, you would repeat the recursive descent and compare the results with the stored values.

的我不主张这种方案特别高性能的，甚至容易（你需要制定一个健壮的命名约定用于存储旧值和大约多线程很小心），但它可能是一般。的

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