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  1. using System;
  2. using System.Collections.Generic;  // for HashSet
  3. using System.Linq;    // for using Where
  4. using System.Reflection;
  5.  
  6. namespace attribute
  7. {
  8. public class Test
  9. {
  10. 	public static void Main()
  11. 	{
  12. 		var targetClasses = new HashSet<string>(new[] { "Foo", "Foo2" });
  13.         var targetFns = new HashSet<string>(new[] { "fn", "fn2", "fn3" });
  14.  
  15.         foreach (var target in targetClasses){
  16.             foreach(var fn in targetFns){
  17.                var method = (target.GetType().GetTypeInfo()) // (typeof(Foo).GetTypeInfo())
  18.                  .DeclaredMethods.Where(x => x.Name == fn).FirstOrDefault();
  19.                 if (method != null) //return 0;
  20.                 {
  21.                 var customAttributes = (MyCustomAttribute[])method
  22.                                        .GetCustomAttributes(typeof(MyCustomAttribute), true);
  23.             if (customAttributes.Length > 0)
  24.             {
  25.                 var myAttribute = customAttributes[0];
  26.                 bool value = myAttribute.condition;
  27.                  Console.WriteLine(value);
  28.                 if (value == true)
  29.                     method.Invoke(null, null);
  30.                 else
  31.                     Console.WriteLine("The attribute parameter is not as required");
  32.             }
  33.                 }
  34.         }
  35.         }
  36. 	}
  37. }
  38. }
  39.  
  40.  
  41. namespace attribute
  42. {
  43.     [AttributeUsage(AttributeTargets.All)]
  44.     public class MyCustomAttribute : Attribute
  45.     {
  46.         public bool condition { get; set; }
  47.     }
  48.  
  49.  
  50.     public class Foo
  51.     {
  52.         [MyCustom(condition= true ? ("bar" == "bar") : false)]
  53.         internal static void fn()
  54.         {
  55.             Console.WriteLine("a function in a class");
  56.         }
  57.  
  58.         [MyCustom(condition= true ? (1 == 2) : false)]
  59.         internal static void fn2()
  60.         {
  61.             Console.WriteLine("another function in the same class");
  62.         }
  63.     }
  64.  
  65.     public class Foo2
  66.     {
  67.         [MyCustom(condition= true ? (1 == 1) : false)]
  68.         internal static void fn2()
  69.         {
  70.             Console.WriteLine("another function in a nother class");
  71.         }
  72.     }
  73. }
Success #stdin #stdout 0s 29288KB
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https://ideone.com/FSOMKi
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
secret

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