Autofac、用户和日志记录

Question

我在我的项目中使用 Autofac，大部分情况下它工作正常。不久前，我需要访问当前用户，并被告知最好的方法是创建一个包装器 class，如下所示：

public class PrincipalProvider : IPrincipalProvider
{
    public IPrincipal User => HttpContext.Current?.User;
}

这在我的应用程序中没有任何问题。我现在有一个新的提供商，如下所示：

public class WmsProvider : IWmsProvider
{
    private readonly Lazy<ILogProvider> _logProvider;
    private readonly Lazy<IMessageProvider> _messageProvider;

    private readonly CormarConfig _config;
    private readonly ClaimsIdentity _identity;

    public WmsProvider(IPrincipalProvider principalProvider, Lazy<ILogProvider> logProvider, Lazy<IMessageProvider> messageProvider)
    {
        _messageProvider = messageProvider;
        _logProvider = logProvider;

        _identity = (ClaimsIdentity)principalProvider.User.Identity;
    }

    /// <summary>
    /// Sends the order to WMS
    /// </summary>
    /// <param name="model">The order model</param>
    public async Task SendAsync(OrderViewModel model)
    {
        var request = WmsFactory.Create(model);
        await _logProvider.Value.TraceAsync($"This is a test", _identity);
        await _messageProvider.Value.CreateAsync(request, model.OrderNumber, MessageType.Wms, "ORD", Method.POST, null);
    }
}

（为简洁起见，我删除了其余代码）

在这种情况下，用户为空并抛出错误（Object 未找到实例）。但是我有另一个 class 具有类似的构造函数：

    public OrderProvider(CormarConfig config, IOrderService orderSerivce, IPrincipalProvider principalProvider, Lazy<IAccountProvider> accountProvider, Lazy<ICollectionManagerProvider> collectionManagerProvider, Lazy<IEmailProvider> emailProvider, Lazy<IJournalProvider> journalProvider, Lazy<IOrderLineProvider> orderLineProvider, Lazy<IStockProvider> stockProvider, Lazy<webServices> webService, Lazy<ITroposOrderLineService> troposOrderLineService, Lazy<ITroposOrderService> troposOrderService, Lazy<ITroposUnitOfWork> troposUnitOfWork, Lazy<IWmsProvider> wmsProvider)
    {
        //Assign our config
        _config = config;

        // Add our services to our class
        _connectionType = config.ConnectionType;
        _orderService = orderSerivce;

        // Add our providers to our class
        _identity = (ClaimsIdentity)principalProvider.User.Identity;

        // Add our optional providers
        _accountProvider = accountProvider;
        _collectionManagerProvider = collectionManagerProvider;
        _emailProvider = emailProvider;
        _journalProvider = journalProvider;
        _orderLineProvider = orderLineProvider;
        _stockProvider = stockProvider;
        _webService = webService;
        _wmsProvider = wmsProvider;
        _troposOrderLineService = troposOrderLineService;
        _troposOrderService = troposOrderService;
        _troposUnitOfWork = troposUnitOfWork;
    }

这很好用。两者在我的 Module:

中的注册方式相同

builder.RegisterType<OrderProvider>().As<IOrderProvider>().InstancePerRequest();
builder.RegisterType<WmsProvider>().As<IWmsProvider>().InstancePerRequest();

builder.RegisterType<PrincipalProvider>().As<IPrincipalProvider>();

需要注意的一点是，WmsProvider 被注入到 OrderProvider 中，因此它不是直接注入到控制器中。控制器构造函数如下所示：

public OrdersController(IOrderProvider provider)
{
    _provider = provider;
}

这可能就是问题所在。在依赖中，上下文不可用吗？如果不是，解决方案是什么？有没有办法从 child?

获取上下文

如有任何帮助，我们将不胜感激。

Answer 1

我想通了。正如我所说，context 在嵌套类中不可用，所以为了解决这个问题，我更改了 PrincipalProvider[=21= 的注册] 每个请求的实例：

builder.RegisterType<PrincipalProvider>().As<IPrincipalProvider>().InstancePerRequest();

然后我将 PrincipalProvider 更改为如下所示：

public class PrincipalProvider : IPrincipalProvider { // Readonly fields private readonly HttpContext _current; /// <summary> /// Default constructor /// </summary> public PrincipalProvider() { _current = HttpContext.Current; } /// <summary> /// Gets the current user /// </summary> public IPrincipal User => _current?.User; }

这解决了我的问题。

Autofac、用户和日志记录

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