Simple C# Reflection Example

ReflectionExample.cs

using System;
using System.Linq;
using System.Reflection;

namespace ReflectionExample
{
  [AttributeUsage(AttributeTargets.Method)]
  class Foo : Attribute
  {
    public string Bar { get; private set; }

    public Foo(string bar)
    {
      Bar = bar;
    }
  }

  class A
  {
    [Foo("Hello,World")]
    public void Bar()
    {
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      A a = new A();

      MethodInfo m = a.GetType().GetMethods().FirstOrDefault(x => x.Name == "Bar");

      if (m != null)
      {
        Foo f = (Foo)m.GetCustomAttributes(false).FirstOrDefault(x => x.GetType() == typeof(Foo));

        if (f != null)
        {
          Console.WriteLine(f.Bar);
        }
      }
    }
  }
}