Csharp/CSharp Tutorial/Reflection/Attributes

Get Custom Attributes

<source lang="csharp">using System; using System.Reflection; class Program {

   static void Main(string[] args) {
       string assemblyName = "Your";
       try {
           Assembly a = Assembly.LoadFrom(assemblyName);
           object[] attributes = a.GetCustomAttributes(true);
           if (attributes.Length > 0) {
               Console.WriteLine("Assembly attributes for "{0}"...", assemblyName);
               foreach (object o in attributes)
                   Console.WriteLine("  {0}", o.ToString());
           } else
               Console.WriteLine("Assembly {0} contains no Attributes.", assemblyName);
       } catch (Exception ex) {
           Console.WriteLine(ex.ToString());
       }
   }

}</source>

Using Reflection to get Custom Attributes

<source lang="csharp">using System; using System.Collections.Generic; using System.Text;

   [AttributeUsage(AttributeTargets.Class |
                   AttributeTargets.Constructor |
                   AttributeTargets.Field |
                   AttributeTargets.Method |
                   AttributeTargets.Property,
                   AllowMultiple = true)]
   public class BugFixAttribute : System.Attribute
   {
       public BugFixAttribute(int bugID,string programmer,string date){
           this.BugID = bugID;
           this.Programmer = programmer;
           this.Date = date;
       }
       public int BugID;
       public string Date;
       public string Programmer;
       public string Comment { get; set; }
   }
   [BugFixAttribute(1, "A", "01/04/05",Comment = "value")]
   public class MyMath{
       public double DoFunc1(double param1)
       {
           return param1 + DoFunc2(param1);
       }
       public double DoFunc2(double param1)
       {
           return param1 / 3;
       }
   }
   public class Tester
   {
       public static void Main()
       {
           MyMath mm = new MyMath();
           System.Reflection.MemberInfo inf = typeof(MyMath);
           object[] attributes;
           attributes = inf.GetCustomAttributes(typeof(BugFixAttribute), false);
           foreach (Object attribute in attributes)
           {
               BugFixAttribute bfa = (BugFixAttribute)attribute;
               Console.WriteLine("\nBugID: {0}", bfa.BugID);
               Console.WriteLine("Programmer: {0}", bfa.Programmer);
               Console.WriteLine("Date: {0}", bfa.Date);
               Console.WriteLine("Comment: {0}", bfa.rument);
           }
       }
   }</source>