using System.Collections.Generic;

​

// 1. Implement error/exception handling on the SearchVehicles function on the VehicleService class

// 2. Implement Depedency Injection - Construction Injection pattern on VehicleService class

// 3. Inject and utilize LoggingService to log any error(s) as part of error/exception handling added on #1

​

public class VehicleService : IVehicleService

{

    public VehicleService()

    {

    }

​

    // Retrieves list of vehicles based on criteria

    public IEnumerable<Vehicle> SearchVehicles(string make, string year, string model)

    {

        VehicleDataService vehicleDataService = new VehicleDataService();

​

        return vehicleDataService.GetVehicles(make, year, model);

    }

}

​

public interface IVehicleService

{

    IEnumerable<Vehicle> SearchVehicles(string make, string year, string model);

}

​

​

public class VehicleDataService

{

    public IEnumerable<Vehicle> GetVehicles(string make, string year, string model)

    {

        // Assume data retrieved thru repository / db / internal or external service

        return new List<Vehicle>();

    }

}

​

public interface IVehicleDataService

{

    IEnumerable<Vehicle> GetVehicles(string make, string year, string model);

}

​

​

public class LoggingService : ILoggingService

{

     public void LogInfo(string msg)

     {

        // throw new NotImplementedException();

     }

​

     public void LogError(string msg)

     {

        // throw new NotImplementedException();

     }

}

​

public interface ILoggingService

{

    void LogInfo(string msg);

    void LogError(string msg);

}

​

public class Vehicle

{

    public int ID { get; set; }

    public string Make { get; set; }

    public string Year { get; set; }

    public string Model { get; set; }

}