title: C# Get List of All Classes with Specific Attribute Parameter
body: <p>I'm trying to get a list of all Classes with a specific Attribute and Enum parameter of the Attribute.</p>
  
  <p>View my example below. I realize how to get all Classes with Attribute <code>GenericConfig</code>, however how do I then filter down on parameter?</p>
  
  <pre><code>namespace ConsoleApp1
  {
      internal class Program
      {
          private static void Main(string[] args)
          {
              // get me all classes with Attriubute GenericConfigAttribute and Parameter Type1
              var type1Types =
                      from type in Assembly.GetExecutingAssembly().GetTypes()
                      where type.IsDefined(typeof(GenericConfigAttribute), false)
                      select type;
  
              Console.WriteLine(type1Types);
          }
      }
  
      public enum GenericConfigType
      {
          Type1,
          Type2
      }
  
      // program should return this class
      [GenericConfig(GenericConfigType.Type1)]
      public class Type1Implementation
      {
      }
  
      // program should not return this class
      [GenericConfig(GenericConfigType.Type2)]
      public class Type2Implementation
      {
      }
  
      [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
      public class GenericConfigAttribute : Attribute
      {
          public GenericConfigType MyEnum;
  
          public GenericConfigAttribute(GenericConfigType myEnum)
          {
              MyEnum = myEnum;
          }
      }
  }
  </code></pre>