How do I call GetCustomAttributes from a Base Class?

I need to be able to retrieve the Custom Att开发者_如何学Pythonributes of a class from a method in its base class. Right now I am doing it via a protected static method in the base class with the following implementation (the class can have multiple instances of the same attribute applied):

//Defined in a 'Base' class
protected static CustomAttribute GetCustomAttribute(int n) 
{
        return new StackFrame(1, false) //get the previous frame in the stack
                                        //and thus the previous method.
            .GetMethod()
            .DeclaringType
            .GetCustomAttributes(typeof(CustomAttribute), false)
            .Select(o => (CustomAttribute)o).ToList()[n];
}

I call it from a derived class thusly:

[CustomAttribute]
[CustomAttribute]
[CustomAttribute]
class Derived: Base
{
    static void Main(string[] args)
    {

        var attribute = GetCustomAttribute(2);

     }

}

Ideally I'd be able to call this from the contructor and cache the results.

Thanks.

PS

I realize that GetCustomAttributes is not guaranteed to return them with respect to lexical order.

If you used instance methods rather than static methods, you could call this.GetType(), even from the base class.

[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
class CustomAttribute : Attribute
{}

abstract class Base
{
    protected Base()
    {
        this.Attributes = Attribute.GetCustomAttributes(this.GetType(), typeof(CustomAttribute))
            .Cast<CustomAttribute>()
            .ToArray();
    }

    protected CustomAttribute[] Attributes { get; private set; }
}

[Custom]
[Custom]
[Custom]
class Derived : Base
{
    static void Main()
    {
        var derived = new Derived();
        var attribute = derived.Attributes[2];
    }
}

It's simpler, and accomplishes the caching in the constructor that you were hoping for.