AutoFac - 每个依赖项的 SingleInstance

Question

AutoFac 是否有可能拥有SingleInstancePerCondition()。 我有两个网站在一个 IIS 网站上运行，我希望有 2 个我的界面实例。

protected void Setup(ContainerBuilder builder)
{
    builder.Register(CreateBackofficeUserService)
        .As<IBackofficeUserService>()
        .SingleInstance()
}   

private static IBackofficeUserService CreateBackofficeUserService(IComponentContext context)
{
    var siteName = Context.GetSiteName();
    if (siteName == "SiteA")
        return new SiteABackofficeUserService();
    else if (siteName == "SiteB")
        return new SiteBBackofficeUserService();
    else
        return null;
}


public interface IBackofficeUserService
{
}

public class SiteABackofficeUserService : IBackofficeUserService
{
}

public class SiteBBackofficeUserService : IBackofficeUserService
{
}

Answer 1

您可以按名称注册两个实例：

builder.RegisterType<SiteABackofficeUserService>()
       .Named<IBackofficeUserService>("SiteA")
       .SingleInstance();

builder.RegisterType<SiteBBackofficeUserService>()
       .Named<IBackofficeUserService>("SiteB")
       .SingleInstance();

然后访问：

container.ResolveNamed<IBackofficeUserService>("SiteA");