Condition property class

 

 

// If wjire or reflect is not defined,
 // the compiler will not generate feature information in the metadata, that is to say, the feature information cannot be found by reflection.//However
 , the definition metadata and implementation of the feature class are still in the assembly
 // #define wjire 
#define refuge

using System;
using System.Diagnostics;
using System.Reflection;

namespace Test3
{
    [Cond]
    class Program
    {
        static void Main(string[] args)
        {
            // Condition attribute class 
            var flag = CustomAttributeExtensions.IsDefined( typeof (Program), typeof (CondAttribute));
            Console.WriteLine(flag);

            var cond = CustomAttributeExtensions.GetCustomAttribute(typeof(Program), typeof(CondAttribute));
            Console.WriteLine(cond?.GetType());
            Console.ReadKey();
        }
    }


    [Conditional("wjire")]
    [Conditional("refuge")]
    class CondAttribute : Attribute
    {
        publicCondAttribute ()
        {
            Console.WriteLine("this is ctor");
        }
    }
}