No database provider has been configured for this DbContext for get method in Asp.netCore

I create an web api project by Asp.net core, and i added an api controller to it(by the name BlogController), in blog controller i have a get method GetAllBlog this is my controller:

[Route("api/[controller]")]
public class BlogController : Controller
{
    private static Logger logger = LogManager.GetCurrentClassLogger();

    public IContext _context { get; set; }
    public BlogController(IContext ctx)
    {
        _context = ctx;
    }

    [HttpGet]
    public IEnumerable<Blog> GetAllBlog()
    {
        return _context.Blogs.ToList();
    }
 }

this is my IContext and model:

public interface IContext : IDisposable
{
    DbSet<Blog> Blogs { get; set; }
    DbSet<Post> Posts { get; set; }
    int SaveChanges();
}

and context:

public class Context : DbContext, IContext
{
    public Context(DbContextOptions<Context> options) : base(options)
    { }
    public virtual DbSet<Blog> Blogs { get; set; }
    public virtual DbSet<Post> Posts { get; set; }
}

and model:

public class Blog
{
    public int BlogId { get; set; }
    public string Name { get; set; }
    public string Url { get; set; }
    public DateTime? CreationDate { get; set; }
    public virtual IList<Post> Posts { get; set; }
}

when i call GetAllBlog() i got this error:

No database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext.OnConfiguring method or by using AddDbContext on the application service provider. If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions object in its constructor and passes it to the base constructor for DbContext. what is the problem?

UPDATE: this is the configurationservice method in Startup class:

public void ConfigureServices(IServiceCollection services)
{
    var connection = @"Data Source=.;Initial Catalog=RestfullServices;Integrated Security=true";
    services.AddDbContext<Context>(options => options.UseSqlServer(connection));
    services.AddScoped<IContext>(p => new Context(new DbContextOptions<Context>()));
    services.AddApplicationInsightsTelemetry(Configuration);
    services.AddMvc();
}