mcs/tests/test-295.cs

   1 using System;
   2 using System.Threading;
   3 using System.Reflection;
   4 using System.Reflection.Emit;
   5
   6
   7 [AttributeUsage (AttributeTargets.All)]
   8 public class MyAttribute : Attribute {
   9         public MyAttribute (object o) {
  10             this.o = o;
  11         }
  12
  13         public object my
  14         {
  15             get {
  16                 return o;
  17             }
  18         }
  19
  20         object o;
  21 }
  22
  23 public class MyConstructorBuilder
  24 {
  25    public static int Main()
  26    {
  27       Type myHelloworld = MyCreateCallee(Thread.GetDomain());
  28       ConstructorInfo myConstructor = myHelloworld.GetConstructor(new Type[]{typeof(String)});
  29       object[] myAttributes1 = myConstructor.GetCustomAttributes(true);
  30       if (myAttributes1 == null)
  31               return 1;
  32       if (myAttributes1.Length != 1)
  33               return 2;
  34       MyAttribute myAttribute = myAttributes1[0] as MyAttribute;
  35       if (myAttribute == null)
  36               return 3;
  37       if (myAttribute.my.GetType() != typeof(TypeCode))
  38               return 4;
  39       return 0;
  40    }
  41
  42    private static Type MyCreateCallee(AppDomain domain)
  43    {
  44       AssemblyName myAssemblyName = new AssemblyName();
  45       myAssemblyName.Name = "EmittedAssembly";
  46       // Define a dynamic assembly in the current application domain.
  47       AssemblyBuilder myAssembly =
  48                   domain.DefineDynamicAssembly(myAssemblyName,AssemblyBuilderAccess.Run);
  49       // Define a dynamic module in this assembly.
  50       ModuleBuilder myModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule");
  51       // Construct a 'TypeBuilder' given the name and attributes.
  52       TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("HelloWorld",
  53          TypeAttributes.Public);
  54       // Define a constructor of the dynamic class.
  55       ConstructorBuilder myConstructor = myTypeBuilder.DefineConstructor(
  56                MethodAttributes.Public, CallingConventions.Standard, new Type[]{typeof(String)});
  57       ILGenerator myILGenerator = myConstructor.GetILGenerator();
  58       myILGenerator.Emit(OpCodes.Ldstr, "Constructor is invoked");
  59       myILGenerator.Emit(OpCodes.Ldarg_1);
  60       MethodInfo myMethodInfo =
  61                      typeof(Console).GetMethod("WriteLine",new Type[]{typeof(string)});
  62       myILGenerator.Emit(OpCodes.Call, myMethodInfo);
  63       myILGenerator.Emit(OpCodes.Ret);
  64       Type myType = typeof(MyAttribute);
  65       ConstructorInfo myConstructorInfo = myType.GetConstructor(new Type[]{typeof(object)});
  66       try
  67       {
  68         CustomAttributeBuilder methodCABuilder = new CustomAttributeBuilder (myConstructorInfo, new object [] { TypeCode.Double } );
  69
  70          myConstructor.SetCustomAttribute(methodCABuilder);
  71       }
  72       catch(ArgumentNullException ex)
  73       {
  74          Console.WriteLine("The following exception has occured : "+ex.Message);
  75       }
  76       catch(Exception ex)
  77       {
  78          Console.WriteLine("The following exception has occured : "+ex.Message);
  79       }
  80       return myTypeBuilder.CreateType();
  81    }
  82 }
  83