C#•2y ago

Unable to import models in service interface

Hi im learning Dependency Injection for the first time and making a micro-project to try it out. But I have a model class in my main project and a class from that model is needed in the service interface however im unable to import the model class in the interface.

namespace ASPNETCoreLearn2.Models
{
    public class CityWeather
    {
        public string CityUniqueCode { get; set; }
        public string CityName { get; set; }
        public DateTime DateAndTime { get; set; }
        public int TemperatureFahrenheit {  get; set; }
    }
}

namespace ASPNETCoreLearn2.Models
{
    public class CityWeather
    {
        public string CityUniqueCode { get; set; }
        public string CityName { get; set; }
        public DateTime DateAndTime { get; set; }
        public int TemperatureFahrenheit {  get; set; }
    }
}

namespace ASPNETCoreLearn2.Models
{
    public class CityWeather
    {
        public string CityUniqueCode { get; set; }
        public string CityName { get; set; }
        public DateTime DateAndTime { get; set; }
        public int TemperatureFahrenheit {  get; set; }
    }
}

namespace ASPNETCoreLearn2.Models
{
    public class CityWeather
    {
        public string CityUniqueCode { get; set; }
        public string CityName { get; set; }
        public DateTime DateAndTime { get; set; }
        public int TemperatureFahrenheit {  get; set; }
    }
}

using ASPNETCoreLearn2.Models; //TYPE OR NAMESPACE COULD NOT BE FOUND
namespace ServiceContracts
{
    public interface IWeatherService
    {
        public List<CityWeather> GetWeatherDetails();
    }
}

using ASPNETCoreLearn2.Models; //TYPE OR NAMESPACE COULD NOT BE FOUND
namespace ServiceContracts
{
    public interface IWeatherService
    {
        public List<CityWeather> GetWeatherDetails();
    }
}

using ASPNETCoreLearn2.Models; //TYPE OR NAMESPACE COULD NOT BE FOUND
namespace ServiceContracts
{
    public interface IWeatherService
    {
        public List<CityWeather> GetWeatherDetails();
    }
}

using ASPNETCoreLearn2.Models; //TYPE OR NAMESPACE COULD NOT BE FOUND
namespace ServiceContracts
{
    public interface IWeatherService
    {
        public List<CityWeather> GetWeatherDetails();
    }
}

I can import ServiceContracts in ASPNETCoreLearn2 but i can't do vice-versa even though ive properly added the project dependencies.

becquerel•4/30/24, 7:18 PM

if you can import ServiceContracts in ASPNETCoreLearn2, that would imply that the ASPNETCoreLearn2 project has a dependency on ServiceContracts

becquerel•4/30/24, 7:18 PM

as opposed to ServiceContracts having a dependency on ASPNETCoreLearn2. which contains the CityWeather type

becquerel•4/30/24, 7:19 PM

does the .csproj for the ServiceContracts project have a reference to the ASPNETCoreLearn2 project?

becquerel•4/30/24, 7:19 PM

project references in .NET are not bi-directional, they are one-way

Bbecquerel if you can import ServiceContracts in ASPNETCoreLearn2, that would imply that th...

!🌸! RushaanOP•4/30/24, 7:19 PM

i have added project dependency of each other in both the projects

becquerel•4/30/24, 7:20 PM

wouldn't that cause a cyclical dependency?

!🌸! RushaanOP•4/30/24, 7:20 PM

okay so how exactly am i supposed to import the models from ASPNETCoreLearn2 and use it in the interface and then use that interface back in ASPNETCoreLearn2

Bbecquerel wouldn't that cause a cyclical dependency?

!🌸! RushaanOP•4/30/24, 7:20 PM

!!🌸! Rushaan okay so how exactly am i supposed to import the models from ASPNETCoreLearn2 and...

becquerel•4/30/24, 7:21 PM

if you have types that are required by multiple projects, you would typically put them in a third, lower-level project

Bbecquerel if you have types that are required by multiple projects, you would typically pu...

!🌸! RushaanOP•4/30/24, 7:21 PM

oh so i create another class library project to store the models u mean?

becquerel•4/30/24, 7:22 PM

yep

becquerel•4/30/24, 7:22 PM

a lot of people make a Models project for this purpose

!🌸! RushaanOP•4/30/24, 7:22 PM

alr that would be like 4th project in my solution

!🌸! RushaanOP•4/30/24, 7:22 PM

i see

!🌸! RushaanOP•4/30/24, 7:22 PM

ty imma try this

becquerel•4/30/24, 7:22 PM

or they call it Core, or Base, or Impl or whatever else

becquerel•4/30/24, 7:23 PM

unfortunately when you try to be 'clean' with projects you kinda just end up having a lot of them

becquerel•4/30/24, 7:23 PM

it is what it is

!🌸! RushaanOP•4/30/24, 7:24 PM

!🌸! RushaanOP•4/30/24, 7:51 PM

ty it worked btw

Unable to import models in service interface

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