在已解析的子范围上设置活动租户

Question

有没有办法在子作用域上设置活动租户？我认为它会产生全局影响，但它不会在子范围 (ILifetimeScope) 已解决后。

依赖关系

<package id="Autofac" version="4.9.2" targetFramework="net471" />
<package id="Autofac.Multitenant" version="4.2.0" targetFramework="net471" />

复制

使用 .net 框架控制台应用程序和上面列出的依赖项编写的复制品。

using Autofac;
using Autofac.Multitenant;

namespace ConsoleAutoFacTenants
{
    class Program
    {
        static void Main(string[] args)
        {
            var builder = new ContainerBuilder();
            builder.RegisterType<GeneralReader>().As<IReader>().InstancePerDependency();
            var appContainer = builder.Build();

            var tenantIdentifier = new AutomationTenantStrategy();
            var mtc = new MultitenantContainer(tenantIdentifier, appContainer);

            mtc.ConfigureTenant("1", b => b.RegisterType<SpecificReader>().As<IReader>().InstancePerDependency());

            // expected
            var reader1 = mtc.Resolve<IReader>();
            System.Diagnostics.Debug.Assert(reader1.Name == "General");

            // unexpected result in debug.assert, assumed that reader2 would resolve type SpecificReader
            var childScoped = mtc.BeginLifetimeScope();
            tenantIdentifier.TenantId = "1";
            var reader2 = childScoped.Resolve<IReader>();
            System.Diagnostics.Debug.Assert(reader2.Name == "Specific");
        }
    }
    internal sealed class AutomationTenantStrategy : ITenantIdentificationStrategy
    {
        public object TenantId { get; set; }
        public bool TryIdentifyTenant(out object tenantId)
        {
            var activeTenant = this.TenantId;
            if (TenantId == null)
            {
                tenantId = null;
                return false;
            }
            tenantId = activeTenant;
            return true;
        }
    }
    public interface IReader
    {
        string Name { get; }
    }
    public sealed class GeneralReader : IReader
    {
        public string Name => "General";
    }
    public sealed class SpecificReader : IReader
    {
        public string Name => "Specific";
    }
}

Answer 1

当您从作用域解析 ILifetimeScope 时，它会 return 自身，而不是创建子生命周期作用域。

这一行：

var childScoped = mtc.Resolve<ILifetimeScope>();

应替换为

var childScoped = mtc.BeginLifetimeScope();

创建新的 LifetimeScope 时，多租户模块会将 tenantId 设置为范围。在您的示例中，您必须在创建子 LifetimeScope

之前 "change" tenantId

tenantIdentifier.TenantId = "1";
var childScoped = mtc.BeginLifetimeScope();

解析后的 IReader 将是为租户指定的。

在已解析的子范围上设置活动租户

Set the active tenant on a resolved child scope

c#

autofac

依赖关系

复制