Question

我真的是.net核心编程的新手，遇到了这个问题，我无法解决。该解决方案构建良好，并且显示了主页，但是当我执行任何操作（例如尝试登录）时，都会收到此错误：（AcademiejaarInst是域类）

InvalidOperationException: No suitable constructor found for entity type 'AcademiejaarInst'. The following constructors had parameters that could not be bound to properties of the entity type: cannot bind 'localizer' in 'AcademiejaarInst(IStringLocalizer<SharedResource> localizer)'.

AcademiejaarInst的负责人

public class AcademiejaarInst
{

    private static IStringLocalizer<SharedResource> _localizer;
    public AcademiejaarInst(IStringLocalizer<SharedResource> localizer)
    {
        _localizer = localizer;
    }
...

如果我尝试进行迁移，情况也是如此。显然，本地化注入不正确，但是我不知道为什么。这些是StartUp.cs中的相关LoC。

    public void ConfigureServices(IServiceCollection services)
    {
      ...
      services.AddMvc(config => ... )
     .AddViewLocalization(o => o.ResourcesPath = "Resources")
     .AddDataAnnotationsLocalization(options => {
                    options.DataAnnotationLocalizerProvider = (type, factory) =>
                        factory.Create(typeof(SharedResource));
                });

     // I tried this but was absolutely not sure this would work.
     services.AddTransient<AcademiejaarInst>();
     services.AddSingleton<IStringLocalizer, StringLocalizer<SharedResource>>();
     services.AddLocalization(o => o.ResourcesPath = "Resources");

     services.Configure<RequestLocalizationOptions>(options =>
     {
         var supportedCultures = new[]
         {
                    new CultureInfo("nl-BE")
         };
         options.DefaultRequestCulture = new RequestCulture("nl-BE", "nl_BE");

         options.SupportedCultures = supportedCultures;

                options.SupportedUICultures = supportedCultures;
     });
     ...
   }

非常感谢您的帮助！

Answer 1

在AcademiejaarInst构造函数中，您期望的是IStringLocalizer<SharedResource>，但是此类型没有配置。

如果您更改

services.AddSingleton<IStringLocalizer, StringLocalizer<SharedResource>>();

到

services.AddSingleton(typeof(IStringLocalizer<SharedResource>), typeof(StringLocalizer<SharedResource));

它应该工作

Answer 2

services.AddLocalization() 调用已经为接口 IStringLocalizer<T> 连接了适当的实现，因此您实际上不需要自己注入它，我认为这是您的问题的来源。

删除为 IStringLocalizer 接口注入特定实现的行应该可以解决您的问题。

为什么执行时IStringLocalizer依赖项注入会引发错误

2 个答案: