實體框架試圖保存外鍵表以及實體保存。如何防止呢？

Question

當我正在保存belwo CounterpartyFrequency實體時，它試圖添加附加的legalEntity。我如何防止這種情況。我只需要交易對手頻率表來插入與CounterpartyFrequencyId和LegalEntityId。 PLZ分享您的想法

[DataContract] 
    public class CounterpartyFrequency : EntityBase 
    { 
     [DataMember] 
     [Key] 
     public int CounterpartyFrequencyId { get; set; } 

     [DataMember] 
     public string LegalEntityId { get; set; } 

     [DataMember] 
     [ForeignKey("LegalEntityId")] 
     public LegalEntity LegalEntity { get; set; } 
    } 

實體我要救高於

using (var dbContext = ConfigurationContext.CreateContext(dbConnection)) 
        { 
         foreach (var counterpartyFrequency in counterpartyFrequencies) 
         { 


          if (
           dbContext.CounterpartyFrequencies.Any(
            (x) => x.CounterpartyFrequencyId == counterpartyFrequency.CounterpartyFrequencyId)) 
          { 
           dbContext.CounterpartyFrequencies.Attach(counterpartyFrequency); 
          } 
          else 
          { 
           dbContext.CounterpartyFrequencies.Add(counterpartyFrequency); 
          } 
         } 

         var noc = dbContext.SaveChanges(); 
        } 

Answer 1

你需要讓LegalEntity虛擬：

[DataContract] 
public class CounterpartyFrequency : EntityBase 
{ 
    [DataMember] 
    [Key] 
    public int CounterpartyFrequencyId { get; set; } 

    [DataMember] 
    public string LegalEntityId { get; set; } 

    [ForeignKey("LegalEntityId")] 
    public virtual LegalEntity LegalEntity { get; set; } 
}