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Example:
[OnlyShowIfValueIsNonZero]
public int Foo { get; set; }
In the code for OnlyShowIfValueIsNonZero, I need to be able to query the value of Foo. Is this possible? If yes, how?
An attribute is not aware of the member it is assigned to, and for an attribute an instance will only be created if you access it via reflection. You cannot let an attribute interact with code directly – there are some frameworks like PostSharp though that inject code at compile time using attributes.
You can however from reflection supply the member it is assigned to, and since you already need the member to access its attributes, you could create a method in that attribute that accepts the member as parameter.