C# 如何使用Autofac正确配置InstancePerTenant？

我一直在尝试使用

InstancePerTenant

为每个租户设置组件实例。但是，

InstancePerTenant

在某种程度上表现得像一个

SingleInstance

。我的设置有问题吗

我有一个ContainerBuilder扩展，它配置了多租户相关的依赖项

public static ContainerBuilder AddMultitenancy(this ContainerBuilder builder)
{
  builder.RegisterType<HttpContextAccessor>().As<IHttpContextAccessor>().SingleInstance();
  builder.RegisterType<TenantStore>().As<ITenantStore>().SingleInstance();
  builder.RegisterType<TenantResolverStrategy>().As<ITenantIdentificationStrategy>().SingleInstance();
  return builder
}

TenantStore只是一个基于tenantId（主机名）从数据库解析租户实体的类

TenantsSpecific.cs和TenantsSpecificController.cs：

public class TenantSpecific
{
  public Guid Id { get; set; }

  public TenantSpecific()
  {
    this.Id = Guid.NewGuid();
  }
}

public class TenantSpecificController : ApiController
{
  private readonly ITenantSpecific tenantSpecific;

  public TenantSpecificController(ITenantSpecific tenantSpecific)
  {
    this.tenantSpecific = tenantSpecific;
  }

  [HttpGet]
  public IActionResult Get()
  {
    return Ok(tenantSpecific.Id);
  }
}

在Program.cs中

public static IHostBuilder CreateHostBuilder(string[] args)
{
  var host = Host.CreateDefaultBuilder(args)
    .UseServiceProviderFactory(new AutofacMultitenantServiceProviderFactory(Startup.ConfigureMultitenantContainer))
    .ConfigureWebHostDefaults(webHostBuilder =>
    {
      webHostBuilder
        .UseConfiguration(ConfigurationModule.GetConfiguration())
        .UseKestrel()
        .UseContentRoot(Directory.GetCurrentDirectory())
        .UseIISIntegration()
        .UseStartup<Startup>();
    });
  return host;
}

公共静态IHostBuilder CreateHostBuilder（字符串[]args）
{
var host=host.CreateDefaultBuilder（args）
.UseServiceProviderFactory（新的AutofacMultitenantServiceProviderFactory（启动.ConfigureMultitenantContainer））
.ConfigureWebHostDefaults（webHostBuilder=>
{
网络主机生成器
.UseConfiguration（ConfigurationModule.GetConfiguration（））
.UseKestrel（）
.UseContentRoot（目录.GetCurrentDirectory（））
.Useii整合（）
.UseStartup（）；
});
返回主机；
}

当我调用and时，

TenantSpecific

的构造函数像Singleton一样只被调用一次。

tenantSpecific.Id

返回相同的值。所以我假设

InstancePerTenant

在这里不起作用

---

我的设置有问题吗？

如文档中所述

您应该添加对

AddAutofacMultitenantRequestServices（）

的调用，以将所需中间件添加到根容器中，这是multitenancy工作所必需的

public void ConfigureServices(IServiceCollection services)
{
    // This will all go in the ROOT CONTAINER and is NOT TENANT SPECIFIC.
    services.AddMvc();
    services.AddControllers();

    // This adds the required middleware to the ROOT CONTAINER and 
    // is required for multitenancy to work.
    services.AddAutofacMultitenantRequestServices();
}

public class TenantSpecific
{
  public Guid Id { get; set; }

  public TenantSpecific()
  {
    this.Id = Guid.NewGuid();
  }
}

public class TenantSpecificController : ApiController
{
  private readonly ITenantSpecific tenantSpecific;

  public TenantSpecificController(ITenantSpecific tenantSpecific)
  {
    this.tenantSpecific = tenantSpecific;
  }

  [HttpGet]
  public IActionResult Get()
  {
    return Ok(tenantSpecific.Id);
  }
}

public static IHostBuilder CreateHostBuilder(string[] args)
{
  var host = Host.CreateDefaultBuilder(args)
    .UseServiceProviderFactory(new AutofacMultitenantServiceProviderFactory(Startup.ConfigureMultitenantContainer))
    .ConfigureWebHostDefaults(webHostBuilder =>
    {
      webHostBuilder
        .UseConfiguration(ConfigurationModule.GetConfiguration())
        .UseKestrel()
        .UseContentRoot(Directory.GetCurrentDirectory())
        .UseIISIntegration()
        .UseStartup<Startup>();
    });
  return host;
}

public void ConfigureServices(IServiceCollection services)
{
    // This will all go in the ROOT CONTAINER and is NOT TENANT SPECIFIC.
    services.AddMvc();
    services.AddControllers();

    // This adds the required middleware to the ROOT CONTAINER and 
    // is required for multitenancy to work.
    services.AddAutofacMultitenantRequestServices();
}