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C# 8: Generic Attributes

https://www.infoq.com/news/2019/01/Generic-Attributes
See More From: infoq.com

Jan 16, 2019 7:13 AM 3+ mon ago

Attributes have been part of .NET since the beginning. As such, they were created before generics were introduced and never quite caught up, which means if you want to refer to a type in the attribute, you must expose a Type parameter or property. For example,

There are some limitations to this pattern. In the above example, X must have a parameterless constructor and inherit from TypeConverter. This cannot be enforced by the compiler, so the developer won't be made aware of mistakes until runtime.

If instead we used a generic type parameter, then constraints can be applied enforcing the rule at compiler time. And the syntax will be slightly cleaner.

In theory the Allow Generic Attributes proposal is a very simple change. The CLR already supports the concept; it is just a matter of exposing it in the .NET ...

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