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 stackoverflow.com/questions/6665187/…

Michael Freidgeim
– Michael Freidgeim

2017-01-01 00:54:40 +00:00
Commented Jan 1, 2017 at 0:54 — Michael Freidgeim
– Michael Freidgeim, Commented Jan 1, 2017 at 0:54

Jon Skeet · Accepted Answer · 2008-12-24 19:27:30Z

11

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, 2008 at 19:27

Jon Skeet

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4 Comments

ManirajSS Over a year ago

still it behaves as same? can't bind runtime values?

Jon Skeet Over a year ago

@ManirajSS: Attributes are compiled into the assembly, so no, they can't reflect anything at execution time. That doesn't stop whatever uses them from doing things at execution time of course - but that's only helpful if it's your code that is using them...

ManirajSS Over a year ago

Thanks. So any suggestions/alternate options to bind values for cache expiry dynamic params of cache attribute?

Jon Skeet Over a year ago

@ManirajSS: Not in the comments of a question from over 15 years ago, for sure. Please ask a new question with appropriate details.

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