c# - 没有构造函数的本地化依赖注入(inject)

Question

我正在 .net 核心中创建自定义授权。一切正常，但我想在属性响应中添加定位器。

下面是我的代码

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true, Inherited = true)]
    public class CustomAuthorizeFilters : AuthorizeAttribute, IAuthorizationFilter
    {
        public CustomAuthorizeFilters()
        { }

        public void OnAuthorization(AuthorizationFilterContext context)
        {
            var User = context.HttpContext.User;

            if (!User.Identity.IsAuthenticated)
                return;

            using (var account_help = new AccountHelpers(Startup.ConnectionString))
            {
                var userId = Guid.Parse(new security.AesAlgoridhm().Decrypt(User.Claims.Where(x => x.Type == JwtRegisteredClaimNames.Sid)?.FirstOrDefault().Value));
                ProfileResponse user = new ProfileResponse();

                if (user == null)
                    context.Result = new CustomResultFilters("error_access_token_expired", 401);

                if (!user.EmailConfirmed)
                    context.Result = new CustomResultFilters("bad_response_account_not_confirmed", 400);

                if (!user.Active)
                    context.Result = new CustomResultFilters("bad_response_account_inactive", 400);
            }
        }
    }

我试过像这样在构造函数中传递定位器，但是当我从 Controller 传递一个参数时，它给我的错误是

attribute constructor parameter has type which is not a valid attribute parameter type

  IStringLocalizer<dynamic> localize { get; set; }
  public CustomAuthorizeFilters(IStringLocalizer<dynamic> localizer = null)
  {
            localize = localizer;
  }

我知道属性只支持原始数据类型，这就是为什么我也尝试注入(inject)直接依赖作为

context.HttpContext.RequestServices.GetService(typeof(IStringLocalizer<dynamic>));

但这是错误的:

cannot convert from object to localizer.

Answer 1

您可以使用 shared资源并像这样获得本地化器

Type localizerType = typeof(IStringLocalizer<SharedResource>);
IStringLocalizer localizer = (IStringLocalizer)context.HttpContext.RequestServices.GetService(localizerType );

或者，如果您使用每个 Controller 的资源，您可以从 context 获取 Controller 类型并获取 Controller 定位器

public void OnAuthorization(AuthorizationFilterContext context)
{
    //..
    Type localizerType = GetLocalizerType(context);
    IStringLocalizer localizer = (IStringLocalizer)context.HttpContext.RequestServices.GetService(localizerType);
    //..
}

private Type GetLocalizerType(AuthorizationFilterContext context)
{
    var controllerType = (context.ActionDescriptor as ControllerActionDescriptor).ControllerTypeInfo;
    return typeof(IStringLocalizer<>).MakeGenericType(controllerType);
}