CODEWITHSUNDEEP
c#custom-attributessystem.reflection.net-standard
WovenTales
WovenTales

Reputation: 45

Retrieve custom attributes of Type in .NET Standard

I'd like to use C#'s reflection and custom attributes to simplify registering a series of types with a central management class (i.e. it provides static methods taking a string key and invoking/retrieving the proper method/parameter for the associated type). Looking at other questions here and a couple places elsewhere, it seems like the best way of doing so is to simply iterate through all public types of the assembly -- since it's intended to be a library -- and check if each type has the proper attribute before adding the relevant values to the underlying Dictionaries. The reflection and iteration will definitely be slow, but I can live with it since it should only occur once.

Unfortunately, I can't figure out how to get an attribute from a type. For methods and assemblies, I can use CustomAttributeExtensions.GetCustomAttribute<MyAttribute>(base) from System.Reflection.Extensions, but that doesn't provide an overload for Type; the same for Assembly.GetCustomAttribute(Assembly, Type) and the .IsDefined(...) methods used in this question. Other suggestions use methods on the Type itself that, from the documentation, seem to be loaded from mscorelib.dll, but it didn't seem to be showing up in Intellisense even after adding the reference and I'm not sure how that .dll interacts with .NET Standard, anyway (as in, does it reduce the ability to run on arbitrary platforms at all?)

Am I missing something obvious, or is it really this hard to get an Attribute back off of a Type?

Upvotes: 3

Views: 3816

Answers (1)

Connell.O&#39;Donnell
Connell.O&#39;Donnell

Reputation: 3723

Try typeof(YourType).GetTypeInfo().GetCustomAttributes();

Upvotes: 6

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