Custom attribute on property - Getting type and value of attributed property

Question

I have the following custom attribute, which can be applied on properties:

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class Id         


        

Answer 1

Something like the following,, this will use only the first property it comes accross that has the attribute, of course you could place it on more than one..

    public object GetIDForPassedInObject(T obj)
    {
        var prop = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance)
                   .FirstOrDefault(p => p.GetCustomAttributes(typeof(IdentifierAttribute), false).Count() ==1);
        object ret = prop !=null ?  prop.GetValue(obj, null) : null;

        return ret;
    }