如何解决无法将类型为“ System.Linq.EnumerableQuery”的对象转换为类型为“ MongoDB.Driver.Linq.IMongoQueryable”的
我有一个带有以下方法句柄的SendNotificationsToSubscribersCommandHandler类,并且我具有测试方法 GetAllSubscriptionsWithCorrectParamsProductId(),以检查Handle方法是否返回正确的列表。
我收到以下错误:
Message:
Test method Grand.Services.Tests.Commands.Handlers.Catalog.SendNotificationsToSubscribersCommandHandlerTest.GetAllSubscriptionsWithCorrectParamsProductId threw exception:
system.invalidCastException: Unable to cast object of type 'System.Linq.EnumerableQuery`1[Grand.Domain.Catalog.BackInStockSubscription]' to type 'MongoDB.Driver.Linq.IMongoQueryable`1[Grand.Domain.Catalog.BackInStockSubscription]'.
Stack Trace:
MongoQueryable.Where[TSource](IMongoQueryable`1 source,Expression`1 predicate)
SendNotificationsToSubscribersCommandHandler
public class SendNotificationsToSubscribersCommandHandler : IRequestHandler<SendNotificationsToSubscribersCommand,IList<BackInStockSubscription>>
{
private readonly ICustomerService _customerService;
private readonly IWorkflowMessageService _workflowMessageService;
private readonly IRepository<BackInStockSubscription> _backInStockSubscriptionRepository;
public SendNotificationsToSubscribersCommandHandler(
ICustomerService customerService,IWorkflowMessageService workflowMessageService,IRepository<BackInStockSubscription> backInStockSubscriptionRepository)
{
_customerService = customerService;
_workflowMessageService = workflowMessageService;
_backInStockSubscriptionRepository = backInStockSubscriptionRepository;
}
public async Task<IList<BackInStockSubscription>> Handle(SendNotificationsToSubscribersCommand request,CancellationToken cancellationToken)
{
if (request.Product == null)
throw new ArgumentNullException("product");
int result = 0;
var query = _backInStockSubscriptionRepository.Table;
//product
query = query.Where(biss => biss.ProductId == request.Product.Id);
//warehouse
if (!string.IsNullOrEmpty(request.Warehouse))
query = query.Where(biss => biss.WarehouseId == request.Warehouse);
//warehouse
if (!string.IsNullOrEmpty(request.AttributeXml))
query = query.Where(biss => biss.AttributeXml == request.AttributeXml);
query = query.OrderByDescending(biss => biss.CreatedOnUtc);
var subscriptions = await query.ToListAsync();
//var subscriptions = await GetAllSubscriptionsByProductId(request.Product.Id,request.AttributeXml,request.Warehouse);
foreach (var subscription in subscriptions)
{
var customer = await _customerService.GetCustomerById(subscription.CustomerId);
//ensure that customer is registered (simple and fast way)
if (customer != null && CommonHelper.IsValidEmail(customer.Email))
{
var customerLanguageId = customer.GetAttributeFromEntity<string>(SystemCustomerAttributeNames.LanguageId,subscription.StoreId);
await _workflowMessageService.SendBackInStockNotification(customer,request.Product,subscription,customerLanguageId);
result++;
}
}
return subscriptions;
}
}
我的测试方法:
[TestClass()]
public class SendNotificationsToSubscribersCommandHandlerTest
{
private Mock<ICustomerService> _mockCustomerService;
private Mock<IRepository<BackInStockSubscription>> _mockBackInStockSubscriptionRepository;
private Mock<IMongoQueryable<BackInStockSubscription>> _mongoQueryableMock;
private IQueryable<BackInStockSubscription> _expectedQueryable;
private List<BackInStockSubscription> _expected;
private Mock<IWorkflowMessageService> _mockWorkflowMessageService;
private SendNotificationsToSubscribersCommandHandler _handler;
private SendNotificationsToSubscribersCommand _sendNotificationsToSubscribersCommand;
[Testinitialize()]
public void Init()
{
_expected = new List<BackInStockSubscription>
{
new BackInStockSubscription { WarehouseId = "11",ProductId = "11" },new BackInStockSubscription { WarehouseId = "11",ProductId = "11" }
};
_mockCustomerService = new Mock<ICustomerService>();
_mockBackInStockSubscriptionRepository = new Mock<IRepository<BackInStockSubscription>>();
_expectedQueryable = _expected.AsQueryable();
_mongoQueryableMock = new Mock<IMongoQueryable<BackInStockSubscription>>();
_mongoQueryableMock.As<IEnumerable<BackInStockSubscription>>();
_mongoQueryableMock.Setup(x => x.ElementType).Returns(_expectedQueryable.ElementType);
_mongoQueryableMock.Setup(x => x.Expression).Returns(_expectedQueryable.Expression);
_mongoQueryableMock.Setup(x => x.Provider).Returns(_expectedQueryable.Provider);
_mongoQueryableMock.Setup(x => x.GetEnumerator()).Returns(_expectedQueryable.GetEnumerator());
_mockBackInStockSubscriptionRepository.Setup(x => x.Table).Returns(_mongoQueryableMock.Object);
_mockWorkflowMessageService = new Mock<IWorkflowMessageService>();
_sendNotificationsToSubscribersCommand = new SendNotificationsToSubscribersCommand { Product = new Product { Id = "11"},Warehouse = "11" };
_handler = new SendNotificationsToSubscribersCommandHandler(_mockCustomerService.Object,_mockWorkflowMessageService.Object,_mockBackInStockSubscriptionRepository.Object);
}
[TestMethod()]
public async Task GetAllSubscriptionsWithCorrectParamsProductId()
{
var result = await _handler.Handle(_sendNotificationsToSubscribersCommand,default);
var resultList = result.ToList();
Assert.AreEqual(resultList,_expected);
}
}
我在线上出错
query = query.Where(biss => biss.ProductId == productId);
更新
当我调试应用程序时,属性_backInStockSubscriptionRepository.Table
具有Expression.Value = {aggregate([])}
如果我调试测试方法属性,则“模拟对象”表的两个对象都具有 Expression.Value ,其中Value = System.Collections.Generic.List<Grand.Domain.Catalog.BackInStockSubscription>
。
非常感谢您的帮助
解决方法
在这里看看:How to mock a class that implements multiple interfaces
尝试这样的事情:
_mongoQueryableMock = new Mock<IMongoQueryable<BackInStockSubscription>>();
_mongoQueryableMock.As<IEnumerable<BackInStockSubscription>>();
...
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