[MonoTouch] Expressions? One Hurdle Down and More After It

[Tim Scott]

Thanks for the suggestion, Jb.  Indeed, 1.2 corrects this issue.  However,
my app did not get much father before it blew up again.

Straight away I got this error:

Attempting to JIT compile method
'Catnap.Maps.Impl.EntityMap`
1<Lunaverse.BillIt.Core.Model.TimeEntry>:Property<bool>
(System.Linq.Expressions.Expression`
1<System.Func`2<Lunaverse.BillIt.Core.Model.TimeEntry, bool>>)' while
running with --aot-only.

   at Lunaverse.BillIt.Core.PersistenceConfigurator.Configure
(System.String connectionString) [0x00000]
   at BillIt.UI.Application.InitializeDatabase () [0x00000]
   at BillIt.UI.Application.Main (System.String[] args) [0x00000]

The line in my code where it blew up is:

   Map.Entity<TimeEntry>().Property(x => x.Billed)

It might not be very clear what this does.  Here is the method signature is:

   EntityMap<T>.Property<TProperty>(Expression<Func<T, TProperty>> property)

Billed is a bool property of TimeEntry.

The section of code where the trouble occurs calls the same Property method
several times with various values for TProperty.  I decided to move things
around and see which ones failed and which ones passed.  Here are the other
errors I was able to produce:

------------------
Attempting to JIT compile method
'Catnap.Maps.Impl.EntityMap`
1<Lunaverse.BillIt.Core.Model.TimeEntry>:Property<System.Decimal>
(System.Linq.Expressions.Expression`
1<System.Func`2<Lunaverse.BillIt.Core.Model.TimeEntry,
System.Decimal>>)' while running with --aot-only.
------------------
Attempting to JIT compile method
'Catnap.Maps.Impl.EntityMap`
1<Lunaverse.BillIt.Core.Model.TimeEntry>
:Property<System.Nullable`1<System.DateTime>>
(System.Linq.Expressions.Expression`
1<System.Func`2<Lunaverse.BillIt.Core.Model.TimeEntry,
System.Nullable`1<System.DateTime>>>)' while running with --aot-only.
-------------------
Attempting to JIT compile method
'Catnap.Maps.Impl.EntityMap`
1<L
unaverse.BillIt.Core.Model.NavigationState>
:Property<System.Nullable`1<int>>
(System.Linq.Expressions.Expression`
1<System.Func`2<Lunaverse.BillIt.Core.Model.NavigationState,
System.Nullable`1<int>>>)' while running with --aot-only.
-------------------

So the types that I have seen to fail are:

int?
decimal
bool
DateTime?

On the other had, it seems to work fine if the type string or a complex
type.

This is a bug (or bugs) in Monotouch, yes?  I guess the team MT just has to
work through these as they come up?  Let me know if there is anything I can
do to expedite.  I would be happy to submit a ticket or whatever will help.



On 10/28/09 9:15 AM, "Jb Evain" <jb at nurv.fr> wrote:

> Hey,
> 
> On 10/27/09, Tim Scott <tscott at lunaversesoftware.com> wrote:
>>  This code does not seem to be doing any JIT compiling.  Should this be
>> supported by MT?  If so I will submit a defect ticket.  Thanks.
> 
> The issue is the one described here:
> 
> http://monotouch.net/Documentation/Troubleshoot
> 
> It's the #16. You can apply the workaround in your own code to make it
> work. MonoTouch 1.2 should fix a few of those cases also.