Hi. In a custom attribute, is there any way for me to discover the
type/member to which the attribute is applied during attribute construction?
For example:
public enum MyEnum
{
[MyCustomAttribu te()]
MyField,
...
}
public MyCustomAttribu te : Attribute
{
public MyCustomAttribu te()
{
// here I would like to discover the type to which
// the attribute is being applied
// e.g. in this example MyEnum.MyField
}
}
Many thanks
kh 4 1578
I don't think you can. Sorry.
What is it that you want it to do? There may be other ways to achieve
your aim...
Marc
I have an attribute with AllowMultiple=t rue but the instance of each
Attribute applied to a member must be unique, using some value on the
attribute as a key. For example
public class MyUniqueAttribu te : Attribute
{
public readonly string Key;
public MyUniqueAttribu te(string key)
{
Key = key;
}
}
I want to be able to check uniqueness such that the following would work for
MyField1 (because the key values are unique) but would throw for MyField2 in
some way:
public MyEnum
{
[MyUniqueAttribu te("One")]
[MyUniqueAttribu te("Two")]
MyField1,
[MyUniqueAttribu te("One")]
[MyUniqueAttribu te("One")]
MyField2
}
I know I can do this by reflecting over all usages of the custom attribute,
but I thought a self-checking attribute (which maintains a registry, by Type,
of all "Key" values applied to the Type) would be a more elegant solution.
Any ideas appreciated
kh
Personally I would add some "#if DEBUG" code to check this at runtime
(by reflecting over all types, perhaps walking the reference tree).
You could perhaps add some code to a key static constructor so that it
is hard to avoid. Or a unit test if you use such.
It would be hard (impossible?) to do at compile-time, which is what
you really want...
Marc
Thanks Marc. Much as I suspected! This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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