C#•7mo 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; }
    }
}

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.

10 Replies

Becquerel•7mo ago

if you can import ServiceContracts in ASPNETCoreLearn2, that would imply that the ASPNETCoreLearn2 project has a dependency on ServiceContracts as opposed to ServiceContracts having a dependency on ASPNETCoreLearn2. which contains the CityWeather type does the .csproj for the ServiceContracts project have a reference to the ASPNETCoreLearn2 project? project references in .NET are not bi-directional, they are one-way

!RushaanOP•7mo ago

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

Becquerel•7mo ago

wouldn't that cause a cyclical dependency?

!RushaanOP•7mo ago

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 ig

Becquerel•7mo ago

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

!RushaanOP•7mo ago

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

Becquerel•7mo ago

yep a lot of people make a Models project for this purpose

!RushaanOP•7mo ago

alr that would be like 4th project in my solution i see ty imma try this

Becquerel•7mo ago

or they call it Core, or Base, or Impl or whatever else unfortunately when you try to be 'clean' with projects you kinda just end up having a lot of them it is what it is

!RushaanOP•7mo ago

oh ty it worked btw

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Unable to import models in service interface