// cs-20.cs : Cannot find attribute type My (maybe you forgot to set the usage using the AttributeUsage attribute ?). // Line : 18 using System; using System.Reflection; namespace Test { //[AttributeUsage (AttributeTargets.All)] public class MyAttribute: Attribute { public string val; public MyAttribute (string stuff) { System.Console.WriteLine (stuff); val = stuff; } } [My("testclass")] public class Test { static public int Main() { System.Reflection.MemberInfo info = typeof (Test); object[] attributes = info.GetCustomAttributes (false); for (int i = 0; i < attributes.Length; i ++) { System.Console.WriteLine(attributes[i]); } if (attributes.Length != 2) return 1; MyAttribute attr = (MyAttribute) attributes [0]; if (attr.val != "testclass") return 2; return 0; } } }