c# - 有没有一种简单的方法可以让 ClassLibrary 获取 session 值？

Question

我有一个外部类库项目，需要从主项目中的 HomeController 获取 session 值集。有没有一种简单的方法可以做到这一点？

或者是否有其他方法可以将值从 HomeController 传输到外部 ClassLibrary？

Answer 1

您可以使用 IHttpContextAccessor class

For other framework and custom components that require access to HttpContext, the recommended approach is to register a dependency using the built-in dependency injection container. The dependency injection container supplies the IHttpContextAccessor to any classes that declare it as a dependency in their constructors.

public void ConfigureServices(IServiceCollection services)
{
     services.AddMvc()
         .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
     services.AddHttpContextAccessor();
     services.AddTransient<IUserRepository, UserRepository>(); 
}

In the following example:

• UserRepository declares its dependency on IHttpContextAccessor.
• The dependency is supplied when dependency injection resolves the dependency chain and creates an instance of UserRepository.

.

public class UserRepository : IUserRepository
{
    private readonly IHttpContextAccessor _httpContextAccessor;

    public UserRepository(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public void LogCurrentUser()
    {
        var username = _httpContextAccessor.HttpContext.User.Identity.Name;
        service.LogAccessRequest(username);
    }
}

不要忘记添加 services.AddHttpContextAccessor(); 以使依赖注入(inject)工作。