代码:
1 using System; 2 using System.ComponentModel; 3 using System.Linq; 4 [Category("nice")] 5 class Foo { } 6 static class Program 7 { 8 static void Main() 9 { 10 var ca = TypeDescriptor.GetAttributes(typeof(Foo)) 11 .OfType<CategoryAttribute>().FirstOrDefault(); 12 Console.WriteLine(ca.Category); // <=== nice 13 TypeDescriptor.AddAttributes(typeof(Foo),new CategoryAttribute("naughty")); 14 ca = TypeDescriptor.GetAttributes(typeof(Foo)) 15 .OfType<CategoryAttribute>().FirstOrDefault(); 16 Console.WriteLine(ca.Category); // <=== naughty 17 } 18 }