A simple attribute example


   

using System;  
using System.Reflection; 
  
[AttributeUsage(AttributeTargets.All)] 
class RemarkAttribute : Attribute { 
  string remarkValue; 
 
  public RemarkAttribute(string comment) { 
    remarkValue = comment; 
  } 
 
  public string remark { 
    get { 
      return remarkValue; 
    } 
  } 
}  
 
[RemarkAttribute("This class uses an attribute.")] 
class UseAttrib { 
  // ... 
} 
 
public class AttribDemo {  
  public static void Main() {  
    Type t = typeof(UseAttrib); 
 
    Console.Write("Attributes in " + t.Name + ": "); 
 
    object[] attribs = t.GetCustomAttributes(false);  
    foreach(object o in attribs) { 
      Console.WriteLine(o); 
    } 
 
    Console.Write("Remark: "); 
 
    // Retrieve the RemarkAttribute. 
    Type tRemAtt = typeof(RemarkAttribute); 
    RemarkAttribute ra = (RemarkAttribute) 
          Attribute.GetCustomAttribute(t, tRemAtt); 
 
 
    Console.WriteLine(ra.remark); 
  }  
}