c# - 检查简单注入(inject)器是否已注册类型

Question

如何存档自动注册但忽略任何已注册的类型？我引用了 Simple Injector 文档中的代码

var repositoryAssembly = typeof(SqlUserRepository).Assembly;

var registrations =
    from type in repositoryAssembly.GetExportedTypes()
    where type.Namespace == "MyComp.MyProd.BL.SqlRepositories"
    where type.GetInterfaces().Any()
    select new 
    { 
        Service = type.GetInterfaces().Single(), 
        Implementation = type 
    };

foreach (var reg in registrations) 
{
    // TODO: how to check reg.Service has already registered or not
    container.Register(reg.Service, reg.Implementation, Lifestyle.Transient);
}

例如，我有接口(interface) ISampleRepository 并且在不同的程序集中有 2 个实现

1. SampleRepository 在程序集“MyComp.MyProd.BL.SqlRepositories”中
2. OverrideSampleRepository 在不同的地方

项目 1:成功

var container = new Container();
container.AutoRegistration();

项目2:异常，因为ISampleRepository已经注册

var container = new Container();
container.Register<ISampleRepository, OverrideSampleRepository>();
container.AutoRegistration(); 

Answer 1

文档 described如何覆盖现有注册。该文档包含以下示例:

var container = new Container();

container.Options.AllowOverridingRegistrations = true;

// Register IUserService.
container.Register<IUserService, FakeUserService>();

// Replaces the previous registration
container.Register<IUserService, RealUserService>();

但是请仔细阅读文档。