EF Core 访问嵌套嵌套实体

Question

我有一个实体CallTrackerLog，它有许多Clients，其中有一个一对多Advices。我正在尝试 HttpPost 为advice 创建一个：

    [HttpPost("{callTrackerId}/{clientId}/advice")]
    public IActionResult CreateCTClientAdvice(int callTrackerId, int clientId,
        [FromBody] CallTrackerClientAdvice newAdvice)
    {
        if (newAdvice == null)
            return BadRequest();

        if (!ModelState.IsValid)
            return BadRequest(ModelState);

        var ctFromStore = _context.CallTrackers
            .Include(log => log.CallTrackerClients)
                .ThenInclude(log => log.CallTrackerClientAdvice)
            .FirstOrDefault(ct => ct.CallTrackerId == callTrackerId);

        var ctAdviceFromStore ctFromStore.CallTrackerClients.CallTrackerClientAdvice
            .FirstOrDefault(c => c.CallTrackerClientId == clientId);

        // ... add to db

        return Ok();
    }

问题是我无法使用.FirstOrDefault(ct => ct.CallTrackerClientId == clientId) 访问CallTrackerClientAdvice - 即使我认为我在上面加载了它，它也会给我一个红色下划线。

错误：

为什么我无法访问CallTrackerClientAdvice？

Answer 1

我怀疑你想要的是：

var ctAdviceFromStore = ctFromStore.CallTrackerClients
        .FirstOrDefault(c => c.CallTrackerClientId == clientId)?.CallTrackerClientAdvice;