问题描述
命名绑定没有内置解决方案。但是,使用工厂方法可能对您的情况有所帮助。示例应如下所示:
创建存储库解析器:
public interface IRepositoryResolver
{
IRepository GetRepositoryByName(string name);
}
public class RepositoryResolver : IRepositoryResolver
{
private readonly IServiceProvider _serviceProvider;
public RepositoryResolver(IServiceProvider serviceProvider)
{
_serviceProvider = serviceProvider;
}
public IRepository GetRepositoryByName(string name)
{
if(name == "TestSuiteRepository")
return _serviceProvider.GetService<TestSuiteRepositor>();
//... other condition
else
return _serviceProvider.GetService<BaseRepositor>();
}
}
services.AddSingleton<IRepositoryResolver, RepositoryResolver>();
services.AddTransient<TestSuiteRepository>();
services.AddTransient<BaseRepository>();
最后在任何类中使用它:
public class BaselineManager
{
private readonly IRepository _repository;
public BaselineManager(IRepositoryResolver repositoryResolver)
{
_repository = repositoryResolver.GetRepositoryByName("TestSuiteRepository");
}
}
解决方法
如何为特定类注入不同的对象实现?
例如,在 Unity 中,我可以定义两个实现IRepository
container.RegisterType<IRepository,TestSuiteRepositor("TestSuiteRepository");
container.RegisterType<IRepository,BaseRepository>();
并调用所需的实现
public BaselineManager([Dependency("TestSuiteRepository")]IRepository repository)