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我目前面临 IMediatR IRequestHandlers 和 IRequest 的问题。为了提供一点上下文,在我们的工具上,用户可以通过填写几个字段来请求访问该工具。目前,我们有两个访问级别,这意味着我们应该有两个 IRequestHandlers,每个一个。由于我们要做的只是将访问请求注册到数据库并发送一封电子邮件,我认为可以创建一个通用的 IRequestHandler 来处理这些情况(如果我们创建移动访问级别,它将在 future 有所帮助)。
我对如何通用注入(inject)这些类型的处理程序进行了一些研究,但我只能找到非通用注入(inject)。我想知道是否有办法为我在下面展示的那些 IRequest 注入(inject)这些类型的通用 IRequestHandlers?
这是我为 IRequest 创建的代码。
public class CreateAccessRequest<TViewModel> : IRequest<OperationResult<long>>, IValidatable
where TViewModel : AccessRequestViewModel
{
public TViewModel Request { get; set; }
}
public class CreateAccessRequestHandler<TViewModel, TNotificationModel, TEntity> : IRequestHandler<CreateAccessRequest<TViewModel>, OperationResult<long>>
where TViewModel : AccessRequestViewModel
where TEntity : Entity
where TNotificationModel : INotification
{
private readonly IRepository<TEntity> _accessRequestRepository;
private readonly IMediator _mediator;
private readonly IMapper _mapper;
public CreateAccessRequestHandler(IRepository<TEntity> accessRequestRepository, IMediator mediator, IMapper mapper)
{
// initalization ...
}
public async Task<OperationResult<long>> Handle(CreateAccessRequest<TViewModel> request, CancellationToken cancellationToken)
{
// mapping, saving to database and sending notifications...
}
}
void ConfigureMediatR(Container container)
{
var assemblies = GetAssemblies().ToArray();
container.RegisterSingleton<IMediator, Mediator>();
container.Register(typeof(IRequestHandler<,>), assemblies);
}
// CreateApplicationAccessRequestViewModel inherits AccessRequestViewModel
var request = new CreateAccessRequest<CreateApplicationAccessRequestViewModel>();
Error constructing handler for the request of type MediatR.IRequestHandler<CreateAccessRequest<CreateApplicationAccessRequestViewModel>, OperationResult<long>>. Register your handlers with the container. See the samples in GitHub for example.
CreateAccessRequestHandler
的类。使用正确的泛型类型,然后它起作用了:
public sealed class CreateApplicationAccessRequestHandler : CreateAccessRequestHandler<CreateApplicationAccessRequestViewModel, ApplicationAccessRequestNotificationModel, ApplicationAccessRequest>
{
public CreateApplicationAccessRequestHandler(IRepository<ApplicationAccessRequest> accessRequestRepository, IMediator mediator, IMapper mapper)
: base(accessRequestRepository, mediator, mapper)
{ }
}
var types = container.GetTypesToRegister(typeof(IRequestHandler<,>), assemblies,
new TypesToRegisterOptions { IncludeGenericTypeDefinitions = true });
container.Register(typeof(IRequestHandler<,>), types.Where(t => !t.IsGenericTypeDefinition));
foreach(var openGenericType in types.Where(t => t.IsGenericTypeDefinition)) {
container.Register(typeof(IRequestHandler<,>), openGenericType);
}
CreateAccessRequest<TViewModel, TEntity>
),它会起作用,但它会破坏项目的架构。所以我选择我在这里提到的备份实现(从这些通用中创建具体的处理程序)至少保持代码集中。
最佳答案
MediatR didn't find the request handler to the request
container.Register(typeof(IRequestHandler<,>), assemblies);
all concrete, non-generic, public and internal types in the given set of
assemblies
that implement the givenopenGenericServiceType
with container's default lifestyle
container.Register(typeof(IRequestHandler<,>), assemblies);
container.Register(typeof(IRequestHandler<,>), typeof(CreateAccessRequestHandler<,>));
var types =
container.GetTypesToRegister(typeof(IRequestHandler<,>), assemblies,
new TypesToRegisterOptions { IncludeGenericTypeDefinitions = true });
container.Register(typeof(IRequestHandler<,>), types);
关于.net - IMediatR - 通用请求的通用请求处理程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60118890/
我目前面临 IMediatR IRequestHandlers 和 IRequest 的问题。为了提供一点上下文,在我们的工具上,用户可以通过填写几个字段来请求访问该工具。目前,我们有两个访问级别,这
根据 MSDN 中 ASP.NET Core 2.2 文档提供的示例,可以通过将以下行添加到 Startup.cs 来将 HttpClient 注入(inject)类型化的客户端(服务类): // S
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