C # objet Initialiseur et ConstructorInfo

Question

point que quelqu'un peut me trouver une solution pour ce qui suit? Je suis en train de reproduire un attribut de propriété que les utilisations objet Initialiseur en utilisant le CustomAttributeBuilder;

ie.

[Display(Order = 0, Name = "UserNameLabel", ResourceType = typeof(RegistrationDataResources))]

..

//Add Display Attribute 
ConstructorInfo displayCtor = typeof(DisplayAttribute).GetConstructor(new Type[] { /* something here? */ });
CustomAttributeBuilder displayAttrib = new CustomAttributeBuilder(displayCtor, new object[] { /*..*/});
propertyBuilder.SetCustomAttribute(displayAttrib);

Answer 1

Il semble que vous devez constructeur d'utilisation de CustomAttributeBuilder qui vous permet de spécifier les propriétés et leurs valeurs. Avez-vous essayé cela?

        ConstructorInfo displayCtor = typeof(TestAttribute).GetConstructor(new Type[] {});
        PropertyInfo conProperty = typeof (TestAttribute).GetProperty("TestProperty");
        CustomAttributeBuilder displayAttrib = new CustomAttributeBuilder(displayCtor, new object[] {}, new[] {conProperty}, new object[] {"Hello"});

Le code ci-dessus va pour:

    [Test(TestProperty = "Hello")]

Notez également que dans votre exemple, votre attribut « Display » ne correspond pas au constructeur « DataValidationAttribute »

Modifier

Exemple complet:

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;

namespace SO5841769
{

    class TestAttribute : Attribute
    {
        public string TestProperty { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            AppDomain myDomain = Thread.GetDomain();
            AssemblyName myAsmName = new AssemblyName();
            myAsmName.Name = "MyDynamicAssembly";
            AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave);
            ModuleBuilder myModBuilder = myAsmBuilder.DefineDynamicModule(myAsmName.Name, myAsmName.Name + ".dll");
            TypeBuilder myTypeBuilder = myModBuilder.DefineType("Data", TypeAttributes.Public);
            FieldBuilder someFieldBuilder = myTypeBuilder.DefineField("someField", typeof(string), FieldAttributes.Private); 
            PropertyBuilder somePropertyBuilder = myTypeBuilder.DefineProperty("SomeProperty", PropertyAttributes.HasDefault, typeof(string), null);
            MethodAttributes getSetAttr = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig;
            ConstructorInfo displayCtor = typeof(TestAttribute).GetConstructor(new Type[] { });
            PropertyInfo conProperty = typeof (TestAttribute).GetProperty("TestProperty");
            CustomAttributeBuilder displayAttrib = new CustomAttributeBuilder(displayCtor, new object[] {}, new[] {conProperty}, new object[] {"Hello"});
            somePropertyBuilder.SetCustomAttribute(displayAttrib);
            MethodBuilder somePropertyGetPropMthdBldr = myTypeBuilder.DefineMethod("get_SomeProperty", getSetAttr, typeof(string), Type.EmptyTypes);
            ILGenerator somePropertyGetIL = somePropertyGetPropMthdBldr.GetILGenerator();
            somePropertyGetIL.Emit(OpCodes.Ldarg_0);
            somePropertyGetIL.Emit(OpCodes.Ldfld, someFieldBuilder);
            somePropertyGetIL.Emit(OpCodes.Ret);
            somePropertyBuilder.SetGetMethod(somePropertyGetPropMthdBldr);
            myTypeBuilder.CreateType();
            myAsmBuilder.Save(myAsmName.Name + ".dll");

        }
    }
}