CODEWITHSUNDEEP
.netreflectionattributes
Brandon Moore
Brandon Moore

Reputation: 8780

How do I get at the metadata of attributed parameters?

How do I get at the attribute of the parameter in the following code?

public void SomeMethod([SomeAttribute] string s)
{
    var someAttribute = ?
}

And I realize the attribute isn't generally for use inside the method it's on... just keeping the example simple though.

Upvotes: 0

Views: 36

Answers (2)

Marc Gravell
Marc Gravell

Reputation: 1062695

First you need a MethodInfo:

var method = typeof(SomeType).GetMethod("SomeMethod");

Then you can check for existence:

bool hasAttrib = Attribute.IsDefined(
    method.GetParameters()[0], typeof(SomeAttribute));

or get an instance (more expensive):

var attrib = (SomeAttribute) Attribute.GetCustomAttribute(
    method.GetParameters()[0], typeof(SomeAttribute));

Upvotes: 2

Brandon Moore
Brandon Moore

Reputation: 8780

I just figured it out:

var someAttribute = typeof(SomeClass).GetMethod("SomeMethod").GetParameters().First().GetCustomAttributes(false);

I just had a brain fart and was using the Attributes property instead of the GetCustomAttributes method.

Upvotes: 2

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