I have a similar problem (also related to Predicate Building)
I defined an expression...
public static Expression<Func<RequiredDevice, bool>> HasWorkstationTag(
string workstation, string tag)
{
string w = workstation.ToLower(), t = tag.ToLower();
var predicate = PredicateBuilder.True<RequiredDevice>();
predicate = predicate.And(x => x.InstanceTag.ToLower() == t);
predicate = predicate.And(x => x.WorkstationId.ToLower() == w);
return predicate;
}
... and query which receives an Expression ...
public IEnumerable<IRequiredDevice> GetDeviceConfigs(IUser user,
Expression<Func<RequiredDevice, bool>> where)
{
List<IRequiredDevice> list = new List<IRequiredDevice>();
list.AddRange(Context.GetSession().QueryOver<RequiredDevice>()
.Where(where)
.List());
return list;
}
... and call the query using the Expression ...
IRequiredDevice config = appManager.PersistenceManager.GetDeviceConfigs(
user, RequiredDeviceLinq.HasWorkstationTag(workstation.Name, rd.
InstanceTag)).FirstOrDefault();
... the result ...
Atf.NUnit.Model.TestTarget.TestDeviceConfig():
System.Exception : Could not determine member type from Constant, True,
System.Linq.Expressions.ConstantExpression
... which I'm guessing comes from Expression method
var predicate = PredicateBuilder.True<RequiredDevice>();
Why is this a problem? Is there a workaround?
On Friday, 10 May 2013 17:16:44 UTC+2, [email protected] wrote:
> using NHibernate.dll, v3.3.1.4000
>
> try this....
>
>
>
> session.QueryOver<model>().Where(param => true);
>
> throws error:
>
> Could not determine member type from Constant, True,
> System.Linq.Expressions.ConstantExpression
>
>
> Don't ask why I want to do that... trust me - there is a reason I need to
> do this related to predicate building.
>
>
>
>
>
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