Check if property has attribute

Question

Given a property in a class, with attributes - what is the fastest way to determine if it contains a given attribute? For example:

    [IsNotNullable]
    [I         


        

Answer 1

If you are trying to do that in a Portable Class Library PCL (like me), then here is how you can do it :)

public class Foo
{
   public string A {get;set;}

   [Special]
   public string B {get;set;}   
}

var type = typeof(Foo);

var specialProperties = type.GetRuntimeProperties()
     .Where(pi => pi.PropertyType == typeof (string) 
      && pi.GetCustomAttributes(true).Any());

You can then check on the number of properties that have this special property if you need to.