static Dictionary<string, MethodInfo> CommandList = new Dictionary<string, MethodInfo>();

    static CommandManager()
    {
        CommandList = Assembly.GetExecutingAssembly().GetTypes()
                      .SelectMany(t => t.GetMethods())
                      .Where(m => m.GetCustomAttributes(typeof(ChatCommandAttribute), false).Length > 0)
                      .ToDictionary(m => m.Name.ToLower(), m => m);
    }

[AttributeUsage(AttributeTargets.Method)]
public class ChatCommandAttribute : Attribute
{
}