Union in entity framework

Question

I have two tables: Vehicles and Workers.

Vehicle(Id, Number)
Workers(Id, Name, ContractorVehicleNumber)

I would like to write lambda que

Answer 1

You cannot construct mapped entity type in projection. Your former example will work only if you create a new special type used for projection:

public class VehicleResult
{
    public string Number { get; set; }
    ... // If you don't need more then one column you can use simple type instead of custom class
}

And your method will look like:

public IQueryable Get(bool includeContractorVehicles)
{
    IQueryable query = GetQuery().Select(v => new VehicleResult { ... });

    if (includeContractorVehicles == true)
    {
        WorkerRepository rep = new WorkerRepository();
        IQueryable contractorsVehicles = rep.GetWorkers().
            Select(x => new VehicleResult()
            {
                Number = x.ContractorVehicleNumber
            });
        query = query.Union(contractorsVehicles);
    }

    return query;
}