UML帮助C＃设计原则

问题描述

我有一个问题，下面理解的UML：

I have a problem understanding an UML below:

具体是什么关系 PersistentSet 和 ThirdPartyPersistentSet ？
是什么持久性对象之间的关系和 ThirdPartyPersistentSet ？

Specifically, what is the relationship between PersistentSet and ThirdPartyPersistentSet?What is the relationship between PersistentObject and ThirdPartyPersistentSet?

请注意，UML是敏捷原则，模式和做法在C＃
到C.马丁罗伯特·马丁2006年弥迦第10章

Please note that the UML is from Agile Principles, Patterns, and Practices in C#By Martin C. Robert, Martin Micah 2006. Chapter 10

提前感谢！

推荐答案

PersistentSet和ThirdPartyPersistentSet之间的关系是一种聚合，这意味着PersistentSet包含一个或多个ThridPartyPersistenSet实例。这是一个弱的关系，这意味着ThirdPartyPersistentSet的实例可以存在PersistentSet之外。

The relationship between PersistentSet and ThirdPartyPersistentSet is an Aggregation, which means the PersistentSet contains one or more ThridPartyPersistenSet instances. This is a "weak" relationship, meaning the instances of ThirdPartyPersistentSet can exist outside of the PersistentSet.

持久性对象和ThirdPartyPersistentSet之间的关系是一个依赖，这意味着基本上ThirdPartyPersistentSet需要。持久性对象做的工作。

The relationship between PersistentObject and ThirdPartyPersistentSet is a Dependency, meaning basically ThirdPartyPersistentSet needs a PersistentObject to do it's work.

那么，把这种代码，您PersistentSet将包含这样的：

So, to translate this to code, your PersistentSet would contain something like this:

public class PersistentSet
{
    public List<ThirdPartyPersistentSet> Items { get; }
    ...
}

和您的ThirdPartyPersistentSet会是这个样子

And your ThirdPartyPersistentSet would look something like this:

public class ThirdPartyPersistentSet
{
    private PersistentObject _object;
    public ThirdPartyPersistentSet(PersistentObject obj)
    {
        _object = obj;
    }
    ...
}

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