C# 我想在dotnetcore web api控制器中使用linq方法从entityframework的多个表中获取数据

//我需要这个格式的列表。我可以使用哪种linq查询方法从数据库中获得这样的结果

    "id": 1,
    "name": "ID-1",
    "duration": 3600,
    "aircraft": "PT-6",
    "syllabus": "BASIC CONV",
    "missionTypeId": 1,
    "phaseId": 1,
    "type": null,
    "phase": null
}

请尝试以下代码：

    {
        "id": 1,
        "name": "ID-1",
        "duration": 3600,
        "aircraft": "PT-6",
        "syllabus": "BASIC CONV",
        "missionTypeId": 1,
        "phaseId": 1,
        "type": {
            "missionTypeId": 1,
            "missionTypeName": "ID - 1 "
        },
        "phase": {
            "phaseId": 1,
            "phaseName": "ID"
        }
    }

---

您需要明确告诉EF Core要加载哪些相关实体

试试这个：

等待上下文。任务
.Include（m=>m.Type）
.包括（m=>m.Phase）
.ToListAsync（）；

这不是问题。请告诉我们你想做什么，你不能做什么，特别是你需要什么帮助。

    {
        "id": 1,
        "name": "ID-1",
        "duration": 3600,
        "aircraft": "PT-6",
        "syllabus": "BASIC CONV",
        "missionTypeId": 1,
        "phaseId": 1,
        "type": {
            "missionTypeId": 1,
            "missionTypeName": "ID - 1 "
        },
        "phase": {
            "phaseId": 1,
            "phaseName": "ID"
        }
    }

var mission = (from m in _context.Missions
                join t in _context.MissionTypes on m.MissionTypeId equals t.MissionTypeId
                join p in _context.Phases on m.PhaseId equals p.PhaseId
                select new Mission
                {
                    Id = m.Id,
                    Name = m.Name,
                    Duration = m.Duration,
                    Aircraft = m.Aircraft,
                    Syllabus = m.Syllabus,
                    MissionTypeId = m.MissionTypeId,
                    PhaseId = m.PhaseId,
                    Type = m.Type,
                    Phase = m.Phase
                }).FirstOrDefault();