如何在另一个模型类中获取领域类的列表数据？

1. Directly add a list property to your model class #

If the list is meant to be part of your model's state (like for passing data between layers or to a view), the simplest approach is to declare a property of type List<DomainClassExample> directly in your model:

public class YourOtherModelClass
{
    // Add any other properties your model needs
    public string ModelName { get; set; }
    
    // The list of DomainClassExample instances
    public List<DomainClassExample> DomainItems { get; set; } = new List<DomainClassExample>();
}

You can then populate this list wherever you need to use the model (e.g., in a controller, service, or factory):

// Example of initializing and populating the model
var myModel = new YourOtherModelClass();
myModel.DomainItems.Add(new DomainClassExample { ClientAssessmentId = 1, IfaId = 100 });
myModel.DomainItems.Add(new DomainClassExample { ClientAssessmentId = 2, IfaId = 101 });

2. Use a service/repository for data-driven scenarios #

If your list comes from a database, API, or external data source, it’s best to abstract the data retrieval into a service or repository. This keeps your model clean and follows the separation of concerns principle.

First, create a service interface and implementation to handle data fetching:

public interface IDomainDataService
{
    List<DomainClassExample> GetDomainItems();
}

public class DomainDataService : IDomainDataService
{
    public List<DomainClassExample> GetDomainItems()
    {
        // Replace this with your actual data retrieval logic (EF Core query, API call, etc.)
        return new List<DomainClassExample>
        {
            new DomainClassExample { ClientAssessmentId = 1, IfaId = 100 },
            new DomainClassExample { ClientAssessmentId = 2, IfaId = 101 }
        };
    }
}

Then, inject this service into your model (or into a class that uses your model, like a controller) to populate the list:

// Using dependency injection (common in ASP.NET Core apps)
public class YourOtherModelClass
{
    public List<DomainClassExample> DomainItems { get; private set; }

    // Constructor injection to get the service
    public YourOtherModelClass(IDomainDataService dataService)
    {
        DomainItems = dataService.GetDomainItems();
    }
}

3. Populate the list via a method (for lazy loading or control) #

If you want more control over when the list is loaded (e.g., lazy loading), you can add a method to your model that initializes or fetches the list on demand:

public class YourOtherModelClass
{
    private List<DomainClassExample> _domainItems;

    public List<DomainClassExample> GetDomainItems()
    {
        if (_domainItems == null)
        {
            // Initialize or fetch the list here
            _domainItems = new List<DomainClassExample>
            {
                new DomainClassExample { ClientAssessmentId = 1, IfaId = 100 }
            };
        }
        return _domainItems;
    }
}

Choose the approach that fits your use case: the first is perfect for simple data transfer, the second works best for enterprise apps with external data sources, and the third gives you fine-grained control over loading behavior.

内容的提问来源于stack exchange，提问作者StarLord