[MonoTouch] Expressions?

[Tim Scott]

Hi,

I am getting the following error (on the device, but not on the simulator).

Attempting to JIT compile method '(wrapper
managed-to-managed) System.Linq.Expressions.ParameterExpression
[]:System.Collections.Generic.ICollection`1.get_Count ()' while
running with --aot-only.

   at System.Linq.Enumerable.ToArray[ParameterExpression]
(IEnumerable`1 source) [0x00000]
   at System.Linq.Enumerable.ToReadOnlyCollection[ParameterExpression]
(IEnumerable`1 source) [0x00000]
   at System.Linq.Expressions.Expression.Lambda[Func`2]
(System.Linq.Expressions.Expression body, IEnumerable`1 parameters)
[0x00000]
   at System.Linq.Expressions.Expression.Lambda[Func`2]
(System.Linq.Expressions.Expression body,
System.Linq.Expressions.ParameterExpression[] parameters) [0x00000]
   at BillIt.UI.Application.Main (System.String[] args) [0x00000]

You can replicate as follows:

public class Application
{
    private static void Main (string[] args)
    {
        DemonstrateError(x => x.Bar);
    }
    
    public class Foo
    {
        public string Bar { get; set; }
    }

    private static void DemonstrateError(Expression<Func<Foo, string>>
expression)
    {
    }
}

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.

By the way I discovered this the first time I tried to use Catnap, a simple
ORM I created, on the device.  (Rather, Bruce Parrot first discovered it.)
I really hope that we will be able to declare and examine expressions (I
know we cannot compile then), because Catnap depends on it.  Thanks again.

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