當IDENTITY_INSERT設置為OFF時，無法為表'ActivityInstances中的標識列插入顯式值

Question

我試圖插入一個新的ActivityInstance，我沒有設置ID，但是實體框架還是試圖插入一個ID。

模型創建和保存命令：

        var ai = new ActivityInstance
        {
            ActivityId = 1,
            LocationId = 1,
            BeginDate = DateTime.Now,
            ExpirationDate = DateTime.Now
        };
        DbContext.ActivityInstances.Add(activityInstance);
        DbContext.SaveChanges();

該模型

public class ActivityInstance : IBusinessObject, IEntity
{
    public int Id { get; set; }
    public int LocationId { get; set; }
    public string TargetId { get; set; }
    public int ActivityId { get; set; }
    public DateTime? BeginDate { get; set; }
    public DateTime? ExpirationDate { get; set; }
    public Guid? DurableInstanceWorkflowId { get; set; }
    public int? TriggeredById { get; set; }
    public virtual Activity Activity { get; set; }
    public virtual Location Location { get; set; }
    public virtual MsdsDataValidation MsdsDataValidation { get; set; }
    public virtual ICollection<ResultsTransmittalQuestionAnswer> ActivityQuestionAnswers { get; set; }
    public virtual ICollection<ResultsTransmittalContact> ResultsTransmittalContacts { get; set; }
    public virtual Target Target { get; set; }
    public virtual CorrectiveActionPlan CorrectiveActionPlans { get; set; }
    public virtual FmVisit FmVisit { get; set; }
    public virtual AcknowledgeReport AcknowledgeReport { get; set; }
    public virtual SlCap SlCap { get; set; }
    public virtual FmVisitStudentRecordReview FmVisitStudentRecordReview { get; set; }
    public virtual ICollection<ActivityInstanceReminder> ActivityInstanceReminders { get; set; } 
   // public virtual InstancesTable Instances { get; set; }
}

映射

    public ActivityInstanceMap()
    {
        ToTable("ActivityInstances");
        HasKey(x => x.Id);

        Property(t => t.Id);
        Property(t => t.LocationId);
        Property(t => t.TargetId);
        Property(t => t.ActivityId);
        Property(t => t.BeginDate);
        Property(t => t.ExpirationDate);
        Property(t => t.DurableInstanceWorkflowId);
        Property(t => t.TriggeredById);

        HasOptional(x => x.Target)
            .WithMany(x => x.ActivityInstances)
            .HasForeignKey(x => x.TargetId);

        HasRequired(t => t.Activity)
            .WithMany(t => t.ActivityInstances)
            .HasForeignKey(t => t.ActivityId);

        HasRequired(t => t.Location)
            .WithMany(t => t.ActivityInstances)
            .HasForeignKey(t => t.LocationId);

        HasOptional(t => t.AcknowledgeReport)
            .WithRequired(t => t.ActivityInstance);

    }

桌子設計

    CREATE TABLE [dbo].[ActivityInstances]
(
    [Id] INT IDENTITY(1,1) NOT NULL, 
    [DurableInstanceWorkflowId] UNIQUEIDENTIFIER NULL,
    [TargetId] NVARCHAR(128) NULL,
    [LocationId] INT NOT NULL, 
    [ActivityId] INT NOT NULL, 
    [BeginDate] DATETIME NULL,
    [ExpirationDate] DATETIME NULL,
    [TriggeredById] INT NULL,
    CONSTRAINT [Pk_ActivityInstances_Id] PRIMARY KEY CLUSTERED ([Id] Asc), 
    CONSTRAINT [Fk_ActivityInstances_ToLocations] FOREIGN KEY ([LocationId]) REFERENCES dbo.Locations([Id]), 
    CONSTRAINT [Fk_ActivityInstances_ToActivities] FOREIGN KEY ([ActivityId]) REFERENCES dbo.Activities([Id]),
    CONSTRAINT [FkInstanceTriggeredInstance] FOREIGN KEY ([TriggeredById]) REFERENCES dbo.ActivityInstances([Id]),
    CONSTRAINT [Fk_ActivityInstances_ToDurableWorkflowInstance] FOREIGN KEY ([DurableInstanceWorkflowId]) REFERENCES [System.Activities.DurableInstancing].InstancesTable([Id])
)

這就是我在“輸出”窗口中得到的。 Id值是默認整數0。

 INSERT [dbo].[ActivityInstances]([Id], [LocationId], [TargetId], [ActivityId], [BeginDate], [ExpirationDate], [DurableInstanceWorkflowId], [TriggeredById])
    VALUES (@0, @1, NULL, @2, @3, @4, NULL, NULL)

更新我用第一個建議的答案修改了ActivityInstance模型，這使我走向了實際問題，盡管我仍然沒有解決。 該建議是修改在id上設置以下內容的ActivityInstance模型

    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

現在我得到了錯誤：

ReferentialConstraint中的從屬屬性映射到商店生成的列。 列：“ Id”。

我目前正在查看可選的一對一關系。 確認報告表為：

創建表[dbo]。[AcknowledgeReports]（[ActivityInstanceId] INT非空，約束[PK_AcknowledgeReportsId]主鍵聚集（[ActivityInstanceId] ASC））

AcknowledgeReport模型

public class AcknowledgeReport : IActivityInstance
{
    public int ActivityInstanceId { get; set; }

    public virtual List<Report> Reports { get; set; }
    public virtual ActivityInstance ActivityInstance { get; set; }

}

和AcknowledgeReport映射

    public AcknowledgeReportMap()
    {
        ToTable("AcknowledgeReports");
        HasKey(t => t.ActivityInstanceId);

        Property(t => t.ActivityInstanceId);


        // Relationships


    }

Answer 1

嘗試添加屬性以使其知道它是數據庫生成的

[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }

Answer 2

由於有了bhmahler的建議，我終於開始研究每一種關系。 其他程序員之一添加了MsdsDataValidation，並在映射關系時向后配置了該關系。 因此，在MsdsDataValidationMap中，他有

            HasOptional(t => t.ActivityInstance)
            .WithRequired(t => t.MsdsDataValidation);

並且應該有

            HasRequired(t => t.ActivityInstance)
            .WithOptional(t => t.MsdsDataValidation);

他的腦袋會被打。 謝謝您的幫助。