在运行时创建C＃类 [英] Creating C# Classes at runtime

问题描述

我一直好奇，在运行时动态的C＃创建类和整个本文栽了跟头。 <一href="http://olondono.blogspot.com/2008/02/creating-$c$c-at-runtime.html">http://olondono.blogspot.com/2008/02/creating-$c$c-at-runtime.html我好奇地听到一些利弊关于建设一类的在运行时。

I have been curious about dynamically create class at runtime in C# and stumbled across this article. http://olondono.blogspot.com/2008/02/creating-code-at-runtime.html I am curious to hear some pros and cons regarding construction of a class at runtime.

任何意见？

推荐答案

元编程具有构建时code-gneneration的所有优点，但没有额外的code步骤。这是库code很常见，如运筹学和管理学，序列化，某些类型的AOP，DI / IoC的容器等。

Meta-programming has all the advantages of build-time code-gneneration, but without the additional code step. This is very common in library code, such as ORMs, serializers, some types of AOP, DI/IoC containers, etc.

• +避免了需要额外的构建步骤或写世俗code
• +例如code能够处理的实际在运行时的情况，而不是处理周围的包装任何不常见的边缘情况下包装或手（Decorator模式）
• +允许codeGEN在场景中的元数据在运行时才知道
• +运行时IL可以有更多的机会进入私人领域等，这要归功于如何 DynamicMethod的可以与类型相关联;完全生成（DLL）code，需要 [InternalsVisibleTo] 或类似的，这也许是不可能
• - 并不是所有的系统的支持的运行code根;上禁用某些服务器设置，紧凑的框架，iPhone等
• - 它的错误丑的事情。不管你怎么做，这是不可以正常code。
• - 它需要的东西实际上是如何在幕后工作的一个很好的理解
• +如果迫使你得到的东西实际上是如何在幕后工作的一个很好的理解

• + avoids the need for extra build steps or writing mundane code
• + such code can handle what actually is the case at runtime, rather than having to handle any uncommon edge-cases or lots of wrappers around wrappers (decorator pattern)
• + allows codegen in scenarios where the metadata is only known at runtime
• + runtime IL can have more access to private fields etc, thanks to how DynamicMethod can be associated with a type; fully generated (dll) code would require [InternalsVisibleTo] or similar, which may be impossible
• - not all systems support runtime code-gen; it is disabled on some server setups, compact framework, iPhone, etc
• - it is bug ugly to do. Regardless of how you do it, this is not normal code.
• - it needs a really good understanding of how things actually work under the covers
• + if forces you to get a really good understanding of how things actually work under the covers

我目前正在重写现有的库来使用运行时白细胞介素的产生;这是非常有益的，我很喜欢它;但它不像的什么的我之前写的。

I'm currently re-writing an existing library to use runtime IL generation; it is very rewarding and I'm happy with it; but it is unlike anything I've written before.

这篇关于在运行时创建C＃类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！