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Asked: 2026-05-10T23:29:05+00:00

I want to specify an argument in an attribute, like this: [OutputCache(Duration = GlobalSettings.GlobalVar)]

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I want to specify an argument in an attribute, like this:

[OutputCache(Duration = GlobalSettings.GlobalVar)]

Where GlobalVar is a variable I defined only once (don’t care where).

Using a configuration setting doesn’t work anyhow, and I can’t get it working with some static class either.

I get the error: An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type

Maybe it’s possible to write a custom wrapper around OutputCache, but that feels like a hack. Am I missing something here??

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1 Answer

  1. The problem is that attribute values have to be determined at compile time – they’re embedded in the assembly. That’s why you have to use a constant expression (not just a global variable – truly a constant).

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