c# - 在服务注册期间确定 ASP.NET Core MVC Area

Question

• 我正在使用 ASP.NET Core
• 我的 IService 已注册到 DI 容器
• 有两种实现:FooService和BarService
• 我必须根据当前请求的 MVC 区域选择一个服务

所以我需要这样的东西:

services.AddScoped<IService>(
    c => IsThisTheFooArea
        ? c.GetRequiredService<FooService>() as IService
        : c.GetRequiredService<BarService>() as IService
);

我不知道如何实现 IsThisTheFooArea 检查。

如何访问 HttpContext 或类似的东西，以便检查当前路由？

Answer 1

这里有一个方法:

配置服务.cs:

        services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
        services.AddScoped<IService>(provider =>
        {
            var actionContextAccessor = provider.GetService<IActionContextAccessor>();
            var descriptor = actionContextAccessor.ActionContext.ActionDescriptor as ControllerActionDescriptor;
            var areaName = descriptor.ControllerTypeInfo.GetCustomAttribute<AreaAttribute>().RouteValue;
            if(areaName == "FooArea")
            {
                return new FooService();
            }
            else
            {
                return new BarService();
            }
        });

服务:

public interface IService { string DoThisThing(); }

public class FooService : IService
{
    public string DoThisThing()
    {
        return "Foo";
    }
}

public class BarService : IService
{
    public string DoThisThing()
    {
        return "Bar";
    }
}

和 Controller :

[Area("FooArea")]
public class FooController : Controller
{
    private readonly IService _service;

    public FooController(IService service)
    {
        _service = service;
    }

    public IActionResult Index()
    {
        return Content(_service.DoThisThing());
    }
}

[Area("BarArea")]
public class BarController : Controller
{
    private readonly IService _service;

    public BarController(IService service)
    {
        _service = service;
    }

    public IActionResult Index()
    {
        return Content(_service.DoThisThing());
    }
}