Is there a way for a simple way for ClassLibrary to get Session Value?

Question

I have an external ClassLibrary Project that needs to get session value set from HomeController in the Main Project. Is there a simple way to accomplish this?

Or is there an alternative to transfer a value from HomeController to an external ClassLibrary?

Answer 1

You can use the 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);
    }
}

Don't forget to add services.AddHttpContextAccessor(); to make the dependency injection work.