UML帮助C＃设计原则 [英] UML help C# Design Principles

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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