如何正确地贯彻执行IUserType？ [英] How to implement correctly IUserType?

问题描述

我需要创建一个<一个href=\"https://www.hibernate.org/hib%5Fdocs/nhibernate/1.2/reference/en/html/mapping.html#mapping-types-custom\">custom通过编写一个新的映射器类实现 IUserType 键入了解 NHibernate的。虽然它是相对简单的覆盖大部分的方法和属性，我得到了一些困难，了解如何与以下成员正确处理：

I need to create a custom type for NHibernate by writing a new mapper class that implements IUserType. While it is relatively straightforward to override most of the methods and properties, I get some difficulties to understand how to deal correctly with the following members:

• 对象装配（对象缓存，对象所有者）;


• 对象正是deepcopy（对象的值）;


• 对象拆解（对象的值）;


• 替换对象（物体原始的，对象目标，对象所有者）;

• object Assemble(object cached, object owner);
• object DeepCopy(object value);
• object Disassemble(object value);
• object Replace(object original, object target, object owner);

我不明白究竟是什么他们的目的;更重要的是如何正确地实现它们。大多数我见过的例子只是返回原始输入参数。

I do not understand what is exactly their purpose; and more important, how to properly implement them. Most of the examples I have seen just return the raw input parameter.

public object DeepCopy(object value)
{
    return value;
}

public object Replace(object original, object target, object owner)
{
    return original;
}

public object Assemble(object cached, object owner)
{
    return cached;
}

public object Disassemble(object value)
{
    return value;
}

如何实现在真实的情况下，或更复杂的情况下这些方法正确

推荐答案

看一看仅限Ritesh饶是如何在他的 NCommon 框架：

Have a look at how Ritesh Rao has done this in his NCommon framework:

的<一个href=\"http://github.com/riteshrao/ncommon/blob/master/NCommon.NHibernate/tests/Domain/MoneyUserType.cs\"相对=nofollow> MoneyUserType 实现所谓的基类<一href=\"http://github.com/riteshrao/ncommon/blob/master/NCommon.NHibernate/src/CompositeUserTypeBase.cs\"相对=nofollow> CompositeUserTypeBase

还有在评论中更多的细节，但总结：

There's more detail in the comments but to summarize:

• deepcopy的 - 应该返回持久状态的深层副本，在实体和集合停止


• 拆卸 - 变换对象到其重新presentation缓存（即协会必须缓存为标识符值）


• 装配 - 重建从缓存重新presentation
对象

<一个href=\"http://web.archive.org/web/20121019101713/http://$c$cinsanity.com/archive/2009/02/12/using-fluent-nhibernate-in-rhinestone-part-i.aspx\"相对=nofollow>它在很多解释这里更详细

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