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我在我的项目中使用Autofac,并且大部分工作正常。前一段时间,我需要得到获取当前用户,被告知要做到这一点的最好办法是创建一个包装类是这样的:Autofac,Users and Logging
public class PrincipalProvider : IPrincipalProvider
{
public IPrincipal User => HttpContext.Current?.User;
}
这已经通过我的应用程序没有任何问题的工作。 我现在有一个新的供应商,看起来像这样:
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);
}
}
(我已经剥离出来为简洁的代码的其余部分)
在这种情况下,用户为null,并抛出一个错误(对象实例未找到)。 但是我有一个类似的构造另一个类:
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;
}
这工作得很好。 两者都注册了相同的方式在我模块:
builder.RegisterType<OrderProvider>().As<IOrderProvider>().InstancePerRequest();
builder.RegisterType<WmsProvider>().As<IWmsProvider>().InstancePerRequest();
builder.RegisterType<PrincipalProvider>().As<IPrincipalProvider>();
有一点要注意,就是WmsProvider注入OrderProvider,所以它不是直接注入到控制器。控制器的构造如下:
public OrdersController(IOrderProvider provider)
{
_provider = provider;
}
这可能是问题所在。在依赖关系中,上下文不可用?如果不是解决方案是什么?有没有一种方法可以从孩子那里得到上下文?
任何帮助,将不胜感激。
'在这种情况下,用户为空并引发错误(未找到对象实例)。哪条线会抛出异常?那个异常的类型是什么? – mjwills