c# 条件编译

using System;
namespace ConditionalCompilation
{
    class Program
    {
        static void Main(string[] args)
        {
            Trace.ShowMessage("Starting");
            Console.WriteLine("Running------");
            Trace.ShowMessage("Ending");
            Console.ReadKey();
        }
    }

    public class Trace
    {
        [System.Diagnostics.Conditional("DEBUG")]
        public static void ShowMessage(string msg)
        {
            Console.WriteLine(" [Trace - " + msg);
        }
    }
}