Question

This is my first LINQ query and I have following error

Cannot implicitly convert type
‘Microsoft.LightSwitch.IDataServiceQueryable<LightSwitchApplication.LettersSentItem>‘
to ‘System.Linq.IQueryable<LightSwitchApplication.LettersSentItem>‘.
An explicit conversion exists (are you missing a cast?)

partial void PatientReminders_PreprocessQuery(ref IQueryable<LettersSentItem> query)
{
    query = from Ltr in PatientsLettersSentDetails
            where Ltr.ResponseTime > 28
            select Ltr;
}

Answer 1

Point out the line maybe ?

And this error is pretty trivial, its expecting a Microsoft.LightSwitch.IDataServiceQueryable and you are giving it a IQueryable. You need to either send an ÌDataServiceQueryable`or transform either one of the expressions to the other type.