ASP.NET Entity Framework InMemory 数据库未保存相关子实体

问：

我有一个 ASP.NET 项目，我尝试使用内存数据库来保存天气对象。

该类包含另一个对象 。在应用程序启动时，我生成数据并将其保存到我的数据库上下文中。但是，在发送 get 请求时，除 location 之外的所有天气属性都有效，该值每次都为 null。WeatherLocation

相关代码：

天气

public class Weather
{
    public int Id { get; private set; }
    public Variable WeatherVariable { get; set; }
    public Unit WeatherUnit { get; set; }
    public Location WeatherLocation { get; set; }
}

位置

public class Location
{
    public int Id { get; private set; }
    public long LocationCode { get; set; }
    public string LocationName { get; set; }
}

在应用开始时，运行以下代码以将数据添加到内存数据库中：

using (var context = new WeatherContext(
           serviceProvider.GetRequiredService<DbContextOptions<WeatherContext>>()))
{
    // Look for any Weather objects.
    if (context.Weathers.Any())
    {
        return; // Data was already seeded
    }
    
    string[] weatherLocations = {
        "Utrecht", "Amersfoort", "Amsterdam", "Langerak", "Putten", "Rotterdam", "Den Haag", "Aken"
    };

    context.Weathers.AddRange(
            Enumerable.Range(1, 5).Select(index => new Weather
            {
                WeatherLocation = new Location
                {
                    LocationCode = Random.Shared.Next(1000, 7000),
                    LocationName = weatherLocations[Random.Shared.Next(weatherLocations.Length)]
                },
                WeatherUnit = Unit.CELSIUS,
                WeatherVariable = Variable.TEMPERATURE
            }).ToList());
    
    // I already tried this from a different stackoverflow question, but didn't work for me.
    context.Weathers.Include(w => w.WeatherLocation);
    
    context.SaveChanges();
}

然后是控制器：

[HttpGet]
public List<Weather> GetWeathers()
{
    _context.Weathers.Include(location => location.WeatherLocation);
    return _context.Weathers.ToList();
}

我已经尝试了多种解决方案。但无论我做什么，子实体 （） 都保持 null：Location

API 响应截图