Question

我有一个现有的数据库，我在多个上下文项目中使用Entity Framework作为项目的上下文。该数据库包含几个类：

市场信息[基类]
MessageType300 [第二级]
米[第3级]
RegisterLevelInformation [第4级]

首先使用现有数据库工具中的代码，它创建了以下内容：

[Table("MarketMessage")]
public partial class MarketMessage
{
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public MarketMessage()
        {
            messageType300 = new HashSet<messageType300>();
            messageType300S = new HashSet<messageType300S>();
            messageType300W = new HashSet<messageType300W>();
            messageType305 = new HashSet<messageType305>();
        }

        public int MarketMessageID { get; set; }

        public DateTime CreatedOn { get; set; }

        [Required]
        [StringLength(4)]
        public string messageType { get; set; }

        [Required]
        [StringLength(8)]
        public string VersionNumber { get; set; }

        public DateTime MarketTimestamp { get; set; }

        [Required]
        [StringLength(35)]
        public string TxRefNbr { get; set; }

        [Required]
        [StringLength(3)]
        public string Sender { get; set; }

        [Required]
        [StringLength(3)]
        public string Recipient { get; set; }

        [StringLength(10)]
        public string alertFlag { get; set; }

        [StringLength(50)]
        public string fileName { get; set; }

        public bool IsDeleted { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<messageType300> messageType300 { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<messageType300S> messageType300S { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<messageType300W> messageType300W { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<messageType305> messageType305 { get; set; }
}

public partial class messageType300
{
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public messageType300()
        {
            Meter = new HashSet<Meter>();
            UsageFactor = new HashSet<UsageFactor>();
        }

        public int messageType300ID { get; set; }

        public int MarketMessageID { get; set; }

        [Required]
        [StringLength(11)]
        public string MPRN { get; set; }

        [StringLength(35)]
        public string MPBR { get; set; }

        [Required]
        [StringLength(35)]
        public string NetworkReferenceNumber { get; set; }

        [Required]
        [StringLength(3)]
        public string LoadProfileCode { get; set; }

        [Required]
        [StringLength(4)]
        public string DUoSGroup { get; set; }

        [Required]
        [StringLength(2)]
        public string MeterPointStatusCode { get; set; }

        public DateTime ReadDate { get; set; }

        public virtual MarketMessage MarketMessage { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Meter> Meter { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<UsageFactor> UsageFactor { get; set; }
}

[Table("Meter")]
public partial class Meter
{
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Meter()
        {
            RegisterLevelInformation = new HashSet<RegisterLevelInformation>();
        }

        public int MeterID { get; set; }

        [StringLength(15)]
        public string MeterCategoryCode { get; set; }

        [Required]
        [StringLength(9)]
        public string SerialNumber { get; set; }

        [StringLength(3)]
        public string MeterLocationCode { get; set; }

        public int? MessageType300ID { get; set; }

        public int? MessageType300SID { get; set; }

        public int? MessageType300WID { get; set; }

        public int? MessageType303RID { get; set; }

        public int? MessageType305ID { get; set; }

        public int? MessageType306ID { get; set; }

        public int? MessageType306WID { get; set; }

        public int? MessageType307ID { get; set; }

        public int? MessageType307WID { get; set; }

        public int? MessageType310ID { get; set; }

        public int? MessageType310WID { get; set; }

        public int? MessageType320ID { get; set; }

        public int? MessageType320WID { get; set; }

        public int? MessageType341ID { get; set; }

        public int? MessageType342ID { get; set; }

        public virtual messageType300 messageType300 { get; set; }

        public virtual messageType300S messageType300S { get; set; }

        public virtual messageType300W messageType300W { get; set; }

        public virtual messageType305 messageType305 { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<RegisterLevelInformation> RegisterLevelInformation { get; set; }
}

[Table("RegisterLevelInformation")]
public partial class RegisterLevelInformation
{
        public int RegisterLevelInformationID { get; set; }

        [Required]
        [StringLength(3)]
        public string MeterRegisterSequence { get; set; }

        [Required]
        [StringLength(10)]
        public string TimeslotCode { get; set; }

        [Required]
        [StringLength(3)]
        public string UOM_Code { get; set; }

        public decimal MeterMultiplier { get; set; }

        public decimal ReadingValue { get; set; }

        [Required]
        [StringLength(2)]
        public string ReadReasonCode { get; set; }

        [Required]
        [StringLength(2)]
        public string ReadTypeCode { get; set; }

        public DateTime? PreviousReadDate { get; set; }

        public decimal Consumption { get; set; }

        public decimal EstimatedConsumption { get; set; }

        [StringLength(4)]
        public string ReadStatusCode { get; set; }

        [StringLength(2)]
        public string RegisterTypeCode { get; set; }

        [StringLength(1)]
        public string PostDecimalDetails { get; set; }

        [StringLength(2)]
        public string PreDecimalDetails { get; set; }

        public int? MeterID { get; set; }

        public int? RemovedMeterRegisterID { get; set; }

        public int? NewMeterRegisterID { get; set; }

        public int? RetainedMeterRegisterID { get; set; }

        public virtual Meter Meter { get; set; }
}

如何调用marketmessage和相关的子项，包括messagetype300，meter和register level information data？

在原始数据库中，我可以使用SQL查询将表连接在一起，如下所示：

select 
    MarketTimestamp, TxRefNbr, Sender, Recipient, MPRN, 
    NetworkReferenceNumber, LoadProfileCode, DUoSGroup, 
    MeterPointStatusCode, ReadDate, SerialNumber,
    MeterRegisterSequence, TimeslotCode, UOM_Code, MeterMultiplier, 
    ReadingValue, ReadReasonCode, ReadTypeCode, PreviousReadDate, 
    Consumption, EstimatedConsumption, ReadStatusCode, RegisterTypeCode 
from 
    marketmessage as a
inner join 
    messagetype300 as b on a.MarketMessageID = b.MarketMessageID 
inner join 
    Meter as c on b.messageType300ID = c.MessageType300ID
inner join 
    RegisterLevelInformation as d on c.MeterID = d.MeterID
where 
    DUoSGroup = 'T021'
    and TimeslotCode = 'UNR'
order by 
    MarketTimestamp desc

我试图通过以下方式加入此项，但我无法从我的视图中访问仪表或寄存器级别信息的属性：

var test = db.MarketMessage.Where(m => m.messageType == "300S")
            .Include(m => m.messageType300S.Select(mt => mt.Meter))
            .ToList();

我正在尝试以下方法：

<td>
            @Html.DisplayFor(modelItem => item.Recipient)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.alertFlag)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.fileName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.IsDeleted)
        </td>
        <td>
        @foreach (var m in item.messageType300S.Select(m => m.Meter).FirstOrDefault())
        {
            @Html.Display(m.SerialNumber)
        }
    </td>

显然我真的不想以这种方式迭代仪表虽然这甚至没有显示序列号，尽管它在我调试时被发现而已经失去了正在发生的事情

使用实体框架

0 个答案: