WPF Prism.Unity - 如何使用命名依赖注入构建 ViewModel

Question

使用Prism 7.1，我可以注册两个命名依赖项：

containerRegistry.Register<ICustomersService, CustomersFakeService>("One");
containerRegistry.Register<ICustomersService, CustomersFakeService>("Two");

现在 - 我如何在 ViewModel 构造函数中使用它们中的任何一个？

public CustomersViewModel(ICustomersService customersService, EventAggregator eventAggregator)

抛出异常：

Resolution of the dependency failed, type = 'WPFPrismDI.ViewModels.CustomersViewModel', name = '(none)'. Exception occurred while: while resolving. Exception is: InvalidOperationException - The current type, WPFPrismDI.Services.ICustomersService, is an interface and cannot be constructed. Are you missing a type mapping? ----------------------------------------------- At the time of the exception, the container was: Resolving WPFPrismDI.ViewModels.CustomersViewModel,(none) Resolving parameter 'customersService' of constructor WPFPrismDI.ViewModels.CustomersViewModel(WPFPrismDI.Services.ICustomersService customersService, Prism.Events.EventAggregator eventAggregator) Resolving WPFPrismDI.Services.ICustomersService,(none)

我的服务实现：

public interface ICustomersService
{
    ObservableCollection<CustomerModel> CustomerGetAll();
}

public class CustomersDBService : ICustomersService
{
    public ObservableCollection<CustomerModel> CustomerGetAll()
    {
        ObservableCollection<CustomerModel> returnValue = new ObservableCollection<CustomerModel>();

        returnValue.Add(new CustomerModel() { NameFirst = "DB", });

        return returnValue;
    }
}

Answer 1

Now - how can I use any of them in CustomersViewModel constructor?

通过全部注入：

public CustomersViewModel(ICustomersService[] customersServices, IEventAggregator eventAggregator)

WPF Prism.Unity - 如何使用命名依赖注入构建 ViewModel

WPF Prism.Unity - how to construct a ViewModel using named dependency injection

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