Sql .NET MVC 5 中的查询

Question

我正在尝试使用 entity framework

执行 SQL 查询

        var timetable = db.Services.SqlQuery("SELECT Services.Date, Services.Time, Trains.Name, ServiceTypes.Name FROM Services INNER JOIN Trains ON Services.TrainId = Trains.Id INNER JOIN ServiceTypes ON Services.ServiceType = ServiceTypes.Id").ToList();

在数据库上执行 SQL 时 returns 数据正常，所以我知道查询有效并且 returns 数据正确。但是，当执行上面的代码行时，出现以下错误。

The data reader is incompatible with the specified 'MyDataModel.Service'. A member of the type, 'Id', does not have a corresponding column in the data reader with the same name

以下是我正在访问的数据模型。

服务模式

public partial class Service
{
    public Service()
    {
        this.Tickets = new HashSet<Ticket>();
        this.TrainStops = new HashSet<ServiceStop>();
    }

    public int Id { get; set; }
    public int TrainId { get; set; }
    public Nullable<int> DisabledUserId { get; set; }
    public System.TimeSpan Time { get; set; }
    public System.DateTime Date { get; set; }
    public int ServiceType { get; set; }

    public virtual Train Train { get; set; }
    public virtual ICollection<Ticket> Tickets { get; set; }
    public virtual ServiceType ServiceTypeId { get; set; }
    public virtual ICollection<ServiceStop> TrainStops { get; set; }
    public virtual User User { get; set; }
}

}

火车模型

    public partial class Train
{
    public Train()
    {
        this.Services = new HashSet<Service>();
        this.Tickets = new HashSet<Ticket>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public string Manufacturer { get; set; }
    public int Year { get; set; }
    public int Seats { get; set; }

    public virtual ICollection<Service> Services { get; set; }
    public virtual ICollection<Ticket> Tickets { get; set; }
}

}

服务类型模型

    public partial class ServiceType
{
    public ServiceType()
    {
        this.Services = new HashSet<Service>();
    }

    public int Id { get; set; }
    public string Name { get; set; }

    public virtual ICollection<Service> Services { get; set; }
}

}

Answer 1

您没有从您的服务中选择 ID 列 table。尝试将其添加到 SQL 字符串中。

Answer 2

查询结果需要完整映射到Service。因此，修改您的 SELECT 以包含所有 Service 列。

Sql .NET MVC 5 中的查询

Sql query in .NET MVC 5

c#

sql

asp.net-mvc

entity-framework

asp.net-mvc-5