[英]Add attribute on property of a runtime created type using reflection
我試圖在運行時創建一個類型,在我為此類型添加的每個屬性上添加一個StuckAttribute
屬性。
類型生成器:
private TypeBuilder getTypeBuilder()
{
var typeSignature = "IDynamicFlattenedType";
var an = new AssemblyName(typeSignature);
AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(an, AssemblyBuilderAccess.Run);
ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("DynamicDomain");
TypeBuilder tb = moduleBuilder.DefineType(typeSignature
, TypeAttributes.Public |
TypeAttributes.Interface) |
TypeAttributes.Abstract |
TypeAttributes.AutoClass |
TypeAttributes.AnsiClass
, null);
return tb;
}
物業開發商:
private void createProperty(TypeBuilder tb, string propertyName, Type propertyType)
{
Type[] ctorParams = new Type[] { typeof(string) };
ConstructorInfo classCtorInfo = typeof(StuckAttribute).GetConstructor(ctorParams);
CustomAttributeBuilder myCABuilder2 = new CustomAttributeBuilder(
classCtorInfo,
new object[] { DateTime.Now.ToString() });
PropertyBuilder propertyBuilder = tb.DefineProperty(propertyName, PropertyAttributes.HasDefault, propertyType, null);
propertyBuilder.SetCustomAttribute(myCABuilder2);
MethodBuilder getPropMthdBldr = tb.DefineMethod("get_" + propertyName,
MethodAttributes.Public |
MethodAttributes.Abstract |
MethodAttributes.Virtual |
MethodAttributes.HideBySig |
MethodAttributes.NewSlot,
CallingConventions.HasThis,
propertyType,
Type.EmptyTypes
);
getPropMthdBldr.SetImplementationFlags(MethodImplAttributes.Managed);
MethodBuilder setPropMthdBldr =
tb.DefineMethod("set_" + propertyName,
MethodAttributes.Public |
MethodAttributes.Abstract |
MethodAttributes.Virtual |
MethodAttributes.HideBySig |
MethodAttributes.NewSlot,
CallingConventions.HasThis,
null, new[] { propertyType });
setPropMthdBldr.SetImplementationFlags(MethodImplAttributes.Managed);
propertyBuilder.SetGetMethod(getPropMthdBldr);
propertyBuilder.SetSetMethod(setPropMthdBldr);
}
我創建了一個簡單的測試,以檢查StuckAttribute
是否在屬性上。 如您所見,我試圖在每個PropertyInfo
元素上獲取屬性調用GetCustomAttributes()
。
[Test]
public void test()
{
Type flattenedType = Reflection.Classes.FlattenClassBuilder.flattenType<TestClass>(this.classes);
flattenedType.Should().NotBeNull();
PropertyInfo[] properties = flattenedType.GetProperties();
properties.Should().NotBeEmpty().And.HaveCount(4);
IEnumerable<Attribute> attrs = properties[0].GetCustomAttributes();
attrs.Should().NotBeEmpty();
}
但是它失敗了。 最后一個斷言失敗:
attrs.Should().NotBeEmpty();
我究竟做錯了什么?
解決了:
我創建了StuckAttribute
作為內部類。 我已經解決了將Accesor類設置為public
。
因此,我的測試現在運行:
PropertyInfo[] properties = flattenedType.GetProperties();
properties.Should().NotBeEmpty().And.HaveCount(4);
properties.Should().OnlyContain(p => p.GetCustomAttribute<Reflection.Classes.FieldPropertyOwnerAttribute>() != null);
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