Question

我有一个提交控制器，与其他几个表有一对多的关系。以下是我的模特：

public partial class Submission
{
    public Submission()
    {
        this.WorkorderLogs = new HashSet<WorkorderLog>();
    }

    public int Id { get; set; }
    public int WorkOrderId { get; set; }
    public int PartStagingId { get; set; }
    public System.DateTime SubmissionDate { get; set; }

    public virtual PartStaging PartStaging { get; set; }
    public virtual WorkOrder WorkOrder { get; set; }
    public virtual ICollection<WorkorderLog> WorkorderLogs { get; set; }
}

我希望应用程序在删除提交记录时删除所有子记录。以下是我的删除方法：

[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
    Submission submission = db.Submissions.Find(id);

    foreach (var w in submission.WorkorderLogs)
    {
        submission.WorkorderLogs.Remove(w);
    }

    db.Submissions.Remove(submission);
    db.SaveChanges();

    return RedirectToAction("Index");
}

这在foreach循环的第一次迭代后给出了一个错误。以下是我得到的错误：

Exception Details: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

在这种情况下如何删除子记录？

Answer 1

我没有启用On Delete Cascade，但我修改了foreach循环并且它可以正常工作

foreach (var w in db.WorkorderLogs.Where(x => x.SubmissionId == submission.Id))
{
    db.WorkorderLogs.Remove(w);
}

删除记录和子记录

1 个答案: