use a global setting as an attribute argument

Question

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??

See http://stackoverflow.com/questions/6665187/how-to-set-dynamic-value-in-my-attribute/6665254#6665254 — Michael Freidgeim, Jan 01 '17 at 00:54

score 9 · Accepted Answer · answered Dec 24 '08 at 19:27

9

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).

answered Dec 24 '08 at 19:27

Jon Skeet

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use a global setting as an attribute argument

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