// Example 16.26 (Figure 16.6)

using System;
using System.Reflection;

[AttributeUsage(AttributeTargets.Class)]
    // Documentation attribute can applied only to classes
public class DocumentationAttribute : System.Attribute {
    public string author;
    public string date;     // these should perhaps be properties
    public double revision;
    public string docString;
    public DocumentationAttribute(string a, string d, double r, string s) {
        author = a;  date = d;  revision = r;  docString = s;
    }
}

[Documentation("Michael Scott",
    "July, 2015", 0.1, "Illustrates the use of attributes")]
public class Attr {
    public static void Main(string[] args) {
        System.Reflection.MemberInfo tp = typeof(Attr);
        object[] attrs =
            tp.GetCustomAttributes(typeof(DocumentationAttribute), false);
            // false means don't search ancestor classes and interfaces
        DocumentationAttribute a = (DocumentationAttribute) attrs[0];
        Console.WriteLine("author:    " + a.author);
        Console.WriteLine("date:      " + a.date);
        Console.WriteLine("revision:  " + a.revision);
        Console.WriteLine("docString: " + a.docString);
    }
}