實體框架配置問題

Question

我需要讓每個SimCompare具有兩個SimCompareSimulationTypes列表。

SimCompare：

public class SimCompare : Report
{
    public string LeftGraphName { get; set; }
    public int? LeftConsolidationId { get; set; }
    public int LeftAsOfDateOffset { get; set; }
    public virtual Consolidation LeftConsolidation { get; set; }
    public virtual ICollection<SimCompareSimulationType> SimCompareLeftSimulations { get; set; }


    public string RightGraphName { get; set; }
    public int? RightConsolidationId { get; set; }
    public int RightAsOfDateOffset { get; set; }
    public virtual Consolidation RightConsolidation { get; set; }
    public virtual ICollection<SimCompareSimulationType> SimCompareRightSimulations { get; set; }

    public bool IsQuarterly { get; set; }
    public virtual ICollection<SimCompareScenarioType> SimCompareScenarioTypes { get; set; }
}

SimCompareSimulationType：

    public class SimCompareSimulationType
{
    public int Id { get; set; }
    public int SimCompareId { get; set; }
    public virtual SimCompare SimCompare { get; set; }
    public int SimulationTypeId { get; set; }
    public virtual SimulationType SimulationType { get; set; }
    public int Priority { get; set; }
}

當它嘗試創建SimCompare時，都不會創建任何集合。 有一個已全部注釋掉的映射文件，我不知道該怎么做。

//HasRequired(l => l.LeftSimCompareSimulationTypes)
        //    .WithMany()
        //    .HasForeignKey(t => t.LeftSimCompareSimulationTypeId)
        //    .WillCascadeOnDelete(false);
//HasRequired(l => l.RightSimCompareSimulationTypes)
        //    .WithMany()
        //    .HasForeignKey(t => t.RightSimCompareSimulationTypeId)
        //    .WillCascadeOnDelete(false);

有什么幫助嗎？ 我對如何工作幾乎一無所知。

Answer 1

用lamemans術語來說，配置指定實體如何轉換為db表。 因此，為了使SimCompare有集合SimCompareSimulationTypes你需要更新配置。

首先使用代碼時，通常需要手動創建配置，會生成默認值，但我經常發現它們不能滿足我100％的要求。

只是出於興趣，您是否嘗試過運行注釋掉的代碼？

this.HasRequired(l => l.LeftSimCompareSimulationTypes)
    .WithMany()
    .HasForeignKey(t => t.LeftSimCompareSimulationTypeId)
    .WillCascadeOnDelete(false);

我們的配置之一的示例。

public class SomeConfiguration: EntityTypeConfiguration<Some>
{

      public SomeConfiguration()
      {
          // Property/column will have a max of 10 & will be required
          this.Property(o => o.Code).HasMaxLength(10).IsRequired();

          // Property/column will have a max of 50 & will be required
          this.Property(o => o.Name).HasMaxLength(50).IsRequired().IsUnicode(false);

          // will be nullable in the db, with a foreign key of ExchangeID
          this.HasOptional(o => o.Exchange).WithMany().HasForeignKey(o => o.ExchangeId).WillCascadeOnDelete(false);    
      }
}