Question

Is there a way around to pass non-constant complex or primitive values to an attribute?

public class SomeClass
{
     private SomeOtherClass _someOtherClass = new SomeOtherClass();
     private int _somePrimitiveVariable = CalculateSomeValue();

     [MyAttribute(InputValue = _someOtherClass)
     public void MyMethod()
     {
         //Some stuff
     }
     //Or can it be like this?
     [MyAttribute(InputValue = _somePrimitiveVariable)
     public void MyMethod()
     {
         //Some stuff
     }
}
Was it helpful?

Solution

Attributes are resolved at compile time, so the comments saying "no" are mostly correct.

However, if you can't rework your design, there are limited workarounds. If this is a universal property you wish to set (that will apply to every user of the attribute), your best bet might be having an initializer method in your code call a configuration method on the attribute. This would look vaguely similar to Can C# Attributes access the Target Class?. Ugly, but might work in specific circumstances.

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