c# - 更新 Entity Framework 中的嵌套对象

Question

最近我发现 EF 不更新嵌套对象。几天来，我试图弄清楚如何做到这一点，但不幸的是，我遇到了这个问题。

我有对象

public class ProjectEntity : AuditableEntity<int>
{

    public string CustumerCompany { get; set; }
    public string CustomerRepresentative { get; set; }

    public string ProjectTitle { get; set; }
    public string WwsNumber { get; set; }

    [ForeignKey("ParentProjectId")]
    public virtual ProjectEntity ParentProject { get; set; }

    public int? ParentProjectId { get; set; }

    public virtual ICollection<ProjectServicesEntity> Service { get; set; }
}

然后是服务对象

public class ProjectServicesEntity : AuditableEntity<int>
{
    /// <summary>
    /// Service Number
    /// </summary>
    public int Number { get; set; }
    /// <summary>
    /// Service Name
    /// </summary>
    public string Name { get; set; }

    /// <summary>
    /// Positions
    /// </summary>
    public virtual ICollection<ProjectPositionsEntity> Positions { get; set; }

    [ForeignKey("ProjectId")]
    public virtual ProjectEntity Project { get; set; }

    public int ProjectId { get; set; }
}

和位置对象:

public class ProjectPositionsEntity : AuditableEntity<int>
{
    /// <summary>
    /// Position number
    /// </summary>
    public int Number { get; set; }

    /// <summary>
    /// Position Name
    /// </summary>
    public string Name { get; set; }

    /// <summary>
    /// Organization Unit for position
    /// </summary>
    public virtual ICollection<ProjectsOutsourcedPositionEntity> OrganizationUnit { get; set; }
    /// <summary>
    /// Represents if position is outsourced
    /// </summary>
    public bool OutSource { get; set; }
    /// <summary>
    /// Comments for position
    /// </summary>
    public string Remarks { get; set; }

    [ForeignKey("ServiceId")]
    public virtual ProjectServicesEntity Service { get; set; }

    public int ServiceId { get; set; }

}}

还有我的更新方法:

public void Update(T entity)
    {

            DbContext.Entry(entity).State = EntityState.Modified;
            DbContext.SaveChanges();
}

当页面显示所有数据时，当我尝试编辑服务或位置中的某些数据时，它不会更新。有人遇到过这种问题吗？

我看到的每个示例都只有 1 层深的嵌套对象，但正如您所见，我的对象有 2 层嵌套。

Answer 1

所以我弄清楚了如何才能完成这项工作。在特定的存储库类中，我做了几个 foreach 循环，将 EntityState 设置为已修改。根据我们的业务规则，Project 需要有 Service 和 Position，而 OrganizationUnit for Position 是可选的，所以我检查它是否不为空。这是我的解决方案:

DbContext.Entry(entity).State = EntityState.Modified;
            foreach (var service in entity.Service)
            {
                DbContext.Entry(service).State = EntityState.Modified;
                foreach (var position in service.Positions)
                {
                    DbContext.Entry(position).State = EntityState.Modified;
                    if (position.OrganizationUnit == null) continue;
                    foreach (var organizationUnit in position.OrganizationUnit)
                    {
                        DbContext.Entry(organizationUnit).State = EntityState.Modified;
                    }
                }
            }
            DbContext.SaveChanges();

现在，当我想在任何级别更新我的对象时，它会在我的数据库中更新。