Is having a NSFetchRequest with an NSPredicate supported in MonoTouch

I have tried the following using an NSPredicate and am not getting the results I would expect:

NSFetchRequest request = new NSFetchRequest ();
request.Entity = NSEntityDescription.EntityForName("Entity", managedObjectContext);

NSSortDescriptor sort = new NSSortDescriptor ("date", false);
request.SortDescriptors = new NSSortDescriptor[1] { sort开发者_如何学Python };
request.Predicate = NSPredicate.FromFormat("stringProperty == %@", new NSObject[1]{new NSString("someString")});

error = null;
NSObject[] results = managedObjectContext.ExecuteFetchRequest (request, out error);

Is NSPredicate supported in the current stable version of MonoTouch (5.0) or am I doing something wrong?

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wow, You're really saving lines of programming here. It is hard to tell with that snippet, but... My best suggestion is to break those lines into more lines, like

NSPredicate *myPredicate = ...
if (myPredicate) {
NSLog (@"Predicate exists");
}

And keep going like that line by line to make sure you're getting the right feedback. That's what I do. Might help a little