Hi,

I have 2 entities: Customer & Account, where a customer can have multiple accounts. On the account, I have a "PlatformTypeId" field, which I need to condition on (multiple values), among other criterions. I'm using Lambda expressions, to build the query. Here's a snippet:

            var customerQuery = (from c in context.CustomerSet.Include("Accounts")
                                 select c);
            if (criterions.UserTypes != null && criterions.UserTypes.Count() > 0)
            {
                List<short> searchCriterionsUserTypes = criterions.UserTypes.Select(i => (short)i).ToList();
                customerQuery = customerQuery.Where(CommonDataObjects.LinqTools.BuildContainsExpression<Customer, short>(c => c.UserTypeId, searchCriterionsUserTypes));
            }
            // Other criterions, including the problematic platforms condition (below)
             var customers = customerQuery.ToList();

I can't figure out how to build the accounts' platforms condition:

            if (criterions.Platforms != null && criterions.Platforms.Count() > 0)
            {
                List<short> searchCriterionsPlatforms = criterions.Platforms.Select(i => (short)i).ToList();
                customerQuery = customerQuery.Where(c => c.Accounts.Where(LinqTools.BuildContainsExpression<Account, short>(a => a.PlatformTypeId, searchCriterionsPlatforms)));
            }

(The BuildContainsExpression is a method we use to build the expression for the multi-select)

I'm getting a compilation error:

The type arguments for method 'System.Linq.Enumerable.Where(System.Collections.Generic.IEnumerable, System.Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

Any idea how to fix this?

Thanks,

Nir.