无法使用实体框架删除子元素

Question

Can someone please help me with my problem? I searched on the internet a lot. But still can't solve it.

I'm using Entity Framework 6 code-first with Microsoft SQL Server.

My entities are like this:

public class StockInfo
{
    [JsonIgnore]
    [Key]
    public int StockInfoID { get; set; }
    [ForeignKey("StockInfoID")]
    public virtual CompanyInfo companyInfo { get; set; }
    [ForeignKey("StockInfo_ID")]
    public virtual List<CorpAction> corpActions { get; set; }
    ...... so on
}

public class CompanyInfo
{
    [JsonIgnore]
    // [Key, ForeignKey("StockInfo")]
    public int CompanyInfoID { get; set; }
    public int avgVolume { get; set; }
    public string coName { get; set; }
    ...........
}

public class CorpAction
{
    public int ID { get; set; }
    public int corpActionType { get; set; }
    public string date { get; set; }
    ........

    public int StockInfo_ID { get; set; }
}

Then I try to save/update StockInfo in my repository:

public void SaveStockInfo(StockInfo StockWeeklyInfo)
{
    var content = context.StockInformation.Where(x => x.companyInfo.symbol == StockWeeklyInfo.companyInfo.symbol).FirstOrDefault();

    if (content == null)
    {
        context.StockInformation.Add(StockWeeklyInfo);
    }
    else
    {
        context.StockInformation.Remove(content);
        context.Entry(content).State = EntityState.Deleted;
        context.StockInformation.Add(StockWeeklyInfo);
    }

    context.SaveChanges();
}

My problem is that when I remove StockInfo and add a new one. In SQL Server, I can see a new StockInfo entity instead of the old one.

But in the CompanyInfo table, Entity Framework just add another one and doesn't delete the previous.

What I am doing wrong? Interestingly, CorpAction works well.

Answer 1

First of all - your code first model looks odd. You have:

  [ForeignKey("StockInfoID")]
  public virtual CompanyInfo companyInfo { get; set; }

and

[ForeignKey("StockInfo_ID")]
public virtual List<CorpAction> corpActions { get; set; }

Are those navigations declared properly? I doubt it, that you CompanyInfo entity has the same Id as StockInfo.

You also expect CompanyInfo to be deleted when StockInfo is deleted. Was the foreign key declared as "ON DELETE CASCADE"?

Please double check this and if it does not help please create "Create a Minimal, Complete, and Verifiable example" and we will try to help :

https://stackoverflow.com/help/mcve

Please add then your database model as well.