Does Check.CustomChecker implicitly check are same

Hi guys,

I'm trying to use natural mocks as follows (DmsService just wraps calls to a 3rd party lib):

SearchConditionSet expectedSearchConditions =
CreateExpectedSearchConditions(DOC_ID, DOC_VERSION);


using (RecordExpectations recorder = RecorderManager.StartRecording())
{
recorder.ExpectAndReturn(
DmsService.FindDocuments(
TRADE_CATEGORY,
expectedSearchConditions),
metaData);

recorder.CheckArguments(Check.IsAny(),
Check.CustomChecker(new
ParameterCheckerEx(CheckSearchConditions),
expectedSearchConditions,
"SearchConditionsDidNotMatch"));
}


and my delegate is

public static bool CheckSearchConditions(
ParameterCheckerEventArgs args)
{
SearchConditionSet actual = (SearchConditionSet)
args.ArgumentValue;
SearchConditionSet expected = (SearchConditionSet)
args.ExpectedValue;

//compare properties...

}

My issue is that my delegate is not called, and I get an error that the passed object is not the same instance as expected. Now the comparison appears to have been done on identity.

Now, I don't want to compare identity, I want to compare the value as I know that the calling code does not use the expectedSearchConditions but something that is equivalent in value.

I expected Check.CustomChecker to allow this, but it appears to be implicitly checking the identity of the argument.

Am I missing something?