如何在运行时动态地向类添加属性？ [英] How to add properties to a class Dynamically at run time?

问题描述

我正在尝试在运行时向运行时添加属性。

因为我想要一些客户的电子邮件ID或电话号码。但不是全部，或者我想动态添加一些属性。请建议。

I am trying to add properties to a class at run time that is on the fly.
As in i want some customers email-id or phone no. but not all,or i want to add some properties on the fly.Please suggest .

推荐答案

你不将能够使用.NET在运行时向类或类的实例添加新属性;您可以在运行时使用Reflection.Emit及其TypeBuilder工具来创建 new 类，并使其从现有Class继承，然后将Properties添加到新类：[ ^ ]。



请注意，如果你进入这个编程领域：它非常复杂，可能会增加你的开发工作的成本。我强烈建议您仔细评估是否真的需要实现此功能。



您可以调查其他替代方案，其中最相关的是：



1.在动态语言运行时（DLR）中使用.NET的Expando对象（FrameWork 4.0）：[ ^ ]，[< a href =http://www.codeproject.com/Articles/42997/NET-4-0-FAQ-Part-1-The-DLR#What是expando对象target =_ blanktitle =新窗口 > ^ ]。 Anoop Madhusudanan有一篇关于CP的优秀文章：[ ^ ]用DLR编程，使用Expando和DynamicObject，以及他自己非常有趣的弹性对象。



另外检查-out：



2.代码编织，AOP，面向方面编程，其中代码中的结构化注释被呈现为由编译后处理器插入的代码IL：[ ^ ]，[ ^ ]，[ ^ ]。

You are not going to be able to add new Properties to a Class, or an instance of the Class, at run-time with .NET; you can use Reflection.Emit and its TypeBuilder facility at run-time to create a new Class, and make it inherit from an existing Class, and then add Properties to the new Class: [^].

Please take note that if you go into this area of programming: it is very complex, and may add substantial costs to your development efforts. I strongly advise you carefully evaluate if you really need to implement this feature.

There are other alternatives you might investigate, the most relevant of which is:

1. Use of .NET's Expando object (FrameWork 4.0) in the Dynamic Language Runtime (DLR): [^], [^]. Anoop Madhusudanan has an outstanding article on CP: [^] on programming with DLR, using Expando and DynamicObject, and his own very interesting "Elastic Object.

Also check-out:

2. Code-Weaving, AOP, Aspect Oriented Programming, in which structured comments in your code are rendered into code inserted by a compile post-processor into IL: [^], [^], [^].

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