AutoFac - 每個依賴項的單一實例

Question

AutoFac有可能擁有SingleInstancePerCondition()。 我有兩個網站在單個IIS網站上運行，我想要有2個我的界面實例。

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

您可以通過名稱註冊兩個實例：

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

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

，然後訪問：

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