C# Attribute or Attribute

Question

I know you can add an attribute to methods in C# like this,

ex1.

[HttpPost]
public void Method()
{
//code
}

Which means the attribute must be satisfied to run Method().

And I know you can stack attributes like this,

ex2.

[HttpPost]
[RequireHttps]
public void Method2()
{
 //More code
}

Which checks that both attribute1 'AND' attribute2 are satisfied before you can use Method2().

But can you 'OR' Attributes? Something like this maybe?

ex3.

[HttpPost || RequireHttps]
public void Method3()
{
  //Even more code
}

So if either attribute is satisfied you can use Method3().

Edit: Sorry was under the impression Attributes where called Annotations. Fixed that.

No, you can't. Out of curiosity, is your example academic, or is that what you're trying to accomplish? — mccow002
– mccow002, Commented Apr 18, 2012 at 14:47
Attributes (which is what you posted as annotations) are just extra meta-data. They don't enforce anything. — Oded
– Oded, Commented Apr 18, 2012 at 14:48
@mccow002 I was trying to accomplish something like this. I'm not savvy enough to ask this question on purpose. :p — Dan
– Dan, Commented Apr 18, 2012 at 15:04

Henk Holterman · Accepted Answer · 2012-04-18 14:51:59Z

6

Which means the annotation must be satisfied to run Method()

That is a misunderstanding.

The [HttpPost] attribute is a directive, this method will only match a Post request. It is not a 'demand' like a security check. Only some attributes work that way.

But when considering them as 'requirements' : they work independently so that will always result in AND behaviour.

edited Apr 18, 2012 at 14:51

answered Apr 18, 2012 at 14:46

Henk Holterman

276k33 gold badges353 silver badges540 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Dan Over a year ago

Funny enough my group is using custom attributes for security. And I need to either annotate the method with a check for 1 of 2 scenarios or find a different way to restrict access to the method. Ideas?

Evgeni Over a year ago

Custom attribute, like you said.. and maybe a PostSharp to make it easier.. Of course, you can always do it in method - if (!Permission.Validate(user, Permisisons.DoSomething)) throw new MyException(); - kind of thing

Henk Holterman Over a year ago

When you write your own Attributes and use for example strings for the Privileges you can make [AuthorizeRequireOr("Admin", "Debugger")]

Dan · Accepted Answer · 2012-05-03 21:58:12Z

1

In C# they are not called annotations, but attributes.
By default attributes aren't used for anything except to decorate an class, method, property, etc. But through reflection you can use them for pretty much what you like, just like ASP.NET MVC does with HttpPost and RequireHttps.

Unfortunately they cannot be OR'ed.

edited May 3, 2012 at 21:58

Dan

2,8437 gold badges42 silver badges56 bronze badges

answered Apr 18, 2012 at 14:52

Xharze

2,7332 gold badges19 silver badges30 bronze badges

Collectives™ on Stack Overflow

C# Attribute or Attribute

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related