什么是对属性ConditionalAttribute吗？ [英] What does ConditionalAttribute on an Attribute do?

问题描述

我知道什么是 ConditionalAttribute 一样。

该文档说，它也可以应用于类，如果

The docs say it can also be applied to a class, if it's derived from Attribute:

[Conditional("DEBUG")]
public class FooAttribute : Attribute { }

的但如何该自定义属性的行为？的（它是剥夺一个发布版本的出来吗？）

But how does that custom attribute behave? (Is it stripped out of a release build?)

推荐答案

@ RicardoPontual的评论给了我一个想法。

@RicardoPontual's comment gave me an idea.

我这样做：

[Conditional("DEBUG")]
public class FooAttribute : Attribute { }

[Foo]
public class Bar { }

我的调试模式的编译，并且加载ILSpy（这是一个反汇编器）的DLL。这是我发现的，符合市场预期：

I compiled in debug mode, and loaded the DLL in ILSpy (it's a disassembler). This is what I found, as expected:

[Foo]
public class Bar { }

然后我的发布模式的编制，并加载该DLL的ILSpy。这是我发现的：

Then I compiled in release mode, and loaded that DLL in ILSpy. This is what I found:

public class Bar { }

的

酒吧类没有装饰这一次！

的因此，得到的答案是，当你装饰与条件一些自定义的属性，那么该属性本身成为以同样的方式为条件。的

So, the answer is that when you decorate some custom attribute with Conditional, then that attribute itself becomes conditional in the same way.

这就是我想要的行为。我最初以为从 ConditionalAttribute 来推导，但它的密封。相反，你需要来装饰你的自定义属性。

That's the behavior I wanted. I initially thought to derive from ConditionalAttribute, but it's sealed. Instead you need to decorate your custom attribute.

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