C# 测试一个类是否有一个属性？
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Test if a class has an attribute?
提问by JoshRivers
I'm trying to do a little Test-First development, and I'm trying to verify that my classes are marked with an attribute:
我正在尝试进行一些测试优先开发，并尝试验证我的类是否标有属性：
[SubControllerActionToViewDataAttribute]
public class ScheduleController : Controller
How do I unit test that the class has that attribute assigned to it?
我如何单元测试该类是否具有分配给它的属性？
采纳答案by Marc Gravell
check that
检查一下
Attribute.GetCustomAttribute(typeof(ScheduleController),
typeof(SubControllerActionToViewDataAttribute))
isn't null (Assert.IsNotNullor similar)
不为空（Assert.IsNotNull或类似的）
(the reason I use this rather than IsDefinedis that most times I want to validate some properties of the attribute too....)
（我使用它的原因而不是IsDefined大多数时候我也想验证属性的一些属性......）
回答by RichardOD
The same you would normally check for an attribute on a class.
与您通常检查类的属性相同。
Here's some sample code.
这是一些示例代码。
typeof(ScheduleController)
.IsDefined(typeof(SubControllerActionToViewDataAttribute), false);
I think in many cases testing for the existence of an attribute in a unit test is wrong. As I've not used MVC contrib's sub controller functionality I can't comment whether it is appropriate in this case though.
我认为在许多情况下，在单元测试中测试属性是否存在是错误的。由于我没有使用 MVC contrib 的子控制器功能，我无法评论它在这种情况下是否合适。
回答by Aleksey L.
I know this thread is really old, but if somebody stumble upon on it you may find fluentassertionsproject very convenient for doing this kind of assertions.
我知道这个线程真的很老，但是如果有人偶然发现它，您可能会发现fluentassertions项目对于执行此类断言非常方便。
typeof(MyPresentationModel).Should().BeDecoratedWith<SomeAttribute>();
回答by Kroltan
It is also possible to use generics on this:
也可以在此使用泛型：
var type = typeof(SomeType);
var attribute = type.GetCustomAttribute<SomeAttribute>();
This way you do not need another typeof(...), which can make the code cleaner.
这样你就不需要另一个typeof(...)，这可以使代码更干净。
