为什么LinkGenerator总是返回null？

如何解决为什么LinkGenerator总是返回null？

我编写了一个类来为其他类（Aspnet core 3.1）生成链接，这些类发送带有链接的电子邮件，并通过DI获取LinkGenerator的实例。

每当我在LinkGenerator实例上调用任何方法时，它都将返回null。我在做错什么吗？

 public interface IPageLinkGenerator
    {
        string LinkFor(string page,object values);
    }

    public class PageLinkGenerator : IPageLinkGenerator
    {
        private readonly IHttpContextAccessor _accessor;
        private readonly LinkGenerator _generator;

        public PageLinkGenerator(IHttpContextAccessor accessor,LinkGenerator generator)
        {
            _accessor = accessor;
            _generator = generator;
        }

        public string LinkFor(string page,object values)
        {
            var context = _accessor.HttpContext;

            var callBackLink = _generator.GetUriByPage(
                context,page: page,handler: null,values: values,scheme: context.Request.Scheme,host: context.Request.Host
                );

            return callBackLink;
        }
    }

这是我来自Startup.cs的ConfigureServices方法

public void ConfigureContainer(ServiceRegistry services)
        {
            services.Scan(_ =>
            {
                _.AssemblyContainingType<IDbConnectionFactory>();
                _.WithDefaultConventions();
                _.ConnectImplementationsToTypesClosing(typeof(IHandle<>));
            });

            services.For<IConfiguration>().Use(Configuration);
            services.For<IStorageClient>().Use<AzureBlobClient>();
            services.AddSingleton<IHttpContextAccessor,HttpContextAccessor>();
            services.AddSingleton<IDomainEventdispatcher,DomainEventdispatcher>();
            services.AddSingleton<IHttpContextAccessor,HttpContextAccessor>();
            services.AddScoped(typeof(IAsyncRepository<>),typeof(EfRepository<>));
            services.AddScoped(typeof(IValidationRepository<>),typeof(ValidationRepository<>));
            
            services.AddCustomisedDbContext(Configuration);
            services.AddHtmlTags(new TagConventions());
            services.AddMediatR(typeof(Startup));

            services.For<IRazorLightEngine>()
                .Use(RazorLightEngineFactory.Get())
                .Singleton();

            services.AddTestConfigurationInstance(_environment,Configuration);
            services.AddEmailSender(_environment);

            services.AddProxyHttpClient();

            services.AddCustomisedIdentity(_environment,Configuration);

            services.AddAuthorizationPolicies(Configuration);

            services.AddCustomisedRazorPages();

            services.AddWkhtmltopdf();

            services.AddLocalization();
            
            services.AddRouting();
        }

这是调用类的方法：

public async Task Handle(BookingAdminMessageCreated @event,CancellationToken cancellationToken)
    {
        var url = _linkGenerator.LinkFor("/Customers/Bookings/Messages",new { Id = @event.BookingId.ToString() });
        
        foreach (var (fullName,emailAddress) in @event.EmailDetails)
        {
            await _emailSender.SendAsync(emailAddress,MailType.MessageAdded,new Dictionary<string,dynamic>
            {
                {"FullName",fullName},{"ReferenceNumber",@event.Reference},{"BookingUrl",HtmlEncoder.Default.Encode(url)},});
        }
    }

解决方法

问题是我错过了页面中的页面名称。我没有指定“索引”页面。

_linkGenerator.LinkFor("/Customers/Bookings/Messages/Index" ...