Question

I’m using a custom attribute inherited from an attribute class. I’m using it like this:

[MyCustomAttribute('CONTROL')] [MyCustomAttribute('ALT')] [MyCustomAttribute('SHIFT')] [MyCustomAttribute('D')] public void setColor() {  } 

But the ‘Duplicate ‘MyCustomAttribute’ attribute’ error is shown.
How can I create a duplicate allowed attribute?

Answer 1

Stick an AttributeUsage attribute onto your Attribute class (yep, that’s mouthful) and set AllowMultiple to true:

[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)] public sealed class MyCustomAttribute: Attribute