ASP.NET Core 1.1 Localization Generic Service

问题

I'm making a ASP.NET Core 1.1 app and trying to setup localization.

When I make on my ValuesController the implementation of IStringLocalizer it works fine and localize my resource file.

public ValuesController(IStringLocalizer<ValuesController> localizer, IService<BaseEntity> service)
{
    _localizer = localizer;
    _service = service;
}

The code above locate my resources at "Resources/Controllers/ValuesController.en-US.resx".

But, when I try to inject the IStringLocalizer with a generic service it can't find my resource file.

public class Service<T> : IService<T>
    where T : BaseEntity
{
    #region Properties
    protected IRepository Repository { get; set; }
    protected IUnitOfWorkFactory UnitOfWorkFactory { get; set; }
    private readonly ILogger _logger;
    private readonly IStringLocalizer _localizer;

    #endregion

    #region Ctor
    public Service(IRepository repository, IUnitOfWorkFactory unitOfWorkFactory,
        ILogger<Service<T>> logger, IStringLocalizer<Service<T>> localizer)
    {
        Repository = repository;
        UnitOfWorkFactory = unitOfWorkFactory;
        _logger = logger;
        _localizer = localizer;
    }
}

The code above doesn't locate my resource at "Resources/Services/Base/Service.en-US.resx"

Any idea on how to do it ?

--- EDIT

MyControl.Api (Startup.cs)

namespace MyControl.Api

services.AddLocalization(options => options.ResourcesPath = "Resources");

This line is inside "MyControl.Api", with is in the namespace "MyControl.Api".

The resources folder in this aplication work for "Resources/Controllers"

My services are in namespace "MyControl.Services"

The resources folder in this Project (two projects inside same solution) are

"Resources/Services/Base"

The namespace of my service file is "MyControl.Services.Services.Base"

回答1:

Explanation

You're right, the problem is in generic class. Accordingly to the source code of ResourceManagerStringLocalizer (it's default IStringLocalizer implementation) - that class contains _resourceBaseName private field. The same string also is used to locate resource files as a search path parameter in ResourceManager class.

When IStringLocalizer is injected into a closed generic type instance, this field is set incorrectly with something like:

FooProject.Resources.Services.FooService`1[[System.Double, System.Private.CoreLib...

Instead of correct one:

FooProject.Resources.Services.FooService

You can check the localizer _resourceBaseName value in debugger. It's probably a bug and you would open an issue about it on GitHub: https://github.com/aspnet/Localization/issues.

Workaround

It is possible to create a ResourceManagerStringLocalizer instance manually. We should take this baseName part from a class full name without a csproj-file name and without a class name itself:

Full class name:

MyCsprojFileName.AnyFolder.SubFolder.FooClass

baseName:

AnyFolder.SubFolder

For the code you provided baseName is probably "Services.Base". Let's write some code to get it in generic way:

public class FooService<T>
{
    private readonly IStringLocalizerFactory _factory;

    public FooService(IStringLocalizerFactory factory)
    {
        _factory = factory;
    }

    public IStringLocalizer GetLocalizer()
    {
        var type = typeof(FooService<>);

        string assemblyName = type.GetTypeInfo().Assembly.GetName().Name;
        string typeName = type.Name.Remove(type.Name.IndexOf('`'));
        string baseName = (type.Namespace + "." + typeName).Substring(assemblyName.Length).Trim('.');

        var localizer = _factory.Create(baseName, assemblyName);

        return localizer;
    }
}

来源：https://stackoverflow.com/questions/44313796/asp-net-core-1-1-localization-generic-service

标签

asp.net-core

.net-core

asp.net-core-localization