// Helper to add a single TDP property to a given entity type.
private static void AddVirtualProperty <TEntity, TProperty>(string propertyName)
{
Type baseType = typeof(TEntity).BaseType;
bool inheritFromBase = baseType != typeof(object);
ICustomTypeDescriptor parent = inheritFromBase ? TypeDescriptor.GetProvider(baseType).GetTypeDescriptor(baseType) : null;
MockTypeDescriptionProvider provider = new MockTypeDescriptionProvider(() =>
{
return(new MockPropertyDescriptor <TProperty>(propertyName, typeof(TEntity), getter: null, setter: null));
}, parent);
TypeDescriptor.AddProvider(provider, typeof(TEntity));
}
private void TestVirtualProperty <T>(Type entityType, bool isReadOnly, Action <Type, PropertyInfo, object> verify)
{
string propertyName = "TestProperty";
MockTypeDescriptionProvider provider = new MockTypeDescriptionProvider(() =>
{
Dictionary <object, T> valueMap = new Dictionary <object, T>();
Action <object, T> setter;
if (isReadOnly)
{
setter = null;
}
else
{
setter = (obj, value) => valueMap[obj] = value;
}
return(new MockPropertyDescriptor <T>(
propertyName,
entityType,
getter: obj =>
{
T value;
valueMap.TryGetValue(obj, out value);
return value;
},
setter: setter));
});
TypeDescriptor.AddProvider(provider, entityType);
HashSet <Type> knownEntityTypes = new HashSet <Type>()
{
entityType
};
Type surrogateType = DataContractSurrogateGenerator.GetSurrogateType(knownEntityTypes, entityType);
object surrogateObj = Activator.CreateInstance(surrogateType, Activator.CreateInstance(entityType));
var p = surrogateType.GetProperty(propertyName);
Assert.IsNotNull(p, "Property doesn't exist.");
verify(surrogateType, p, surrogateObj);
TypeDescriptor.RemoveProvider(provider, entityType);
}