在实体框架中更新嵌套对象 [英] Updating Nested Objects in Entity Framework

问题描述

最近，我发现EF不会更新嵌套对象. 几天来，我试图弄清楚如何做到这一点，但不幸的是，我仍然坚持这个问题.

recently I discover that EF doesn't update nested object. For few days I try to figure out how to do this but unfortunately I'm stuck with this problem.

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; }
}

和排名对象:

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; }

}}

我的更新方法:

public void Update(T entity)
    {

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

当有页面时，所有数据都被表示出来，而当我尝试在Service或Position中编辑一些数据时，它不会更新. 有人遇到过这种问题吗?

When have page were all data is represented and when I try to edit some data in Service's or in Position's it doesn't update. Anybody had this kind of problem ?

我看到的每个示例都仅包含嵌套对象，该嵌套对象的深度为1层，但是您可以看到我的对象具有2层嵌套.

Every example that I saw it was only with nested object that has 1 level deep but as you can see my object has 2 level nest.

推荐答案

因此，我弄清楚了如何进行这项工作. 在特定的存储库类中，我做了几个foreach循环，这些循环将EntityState设置为Modifyed.根据我们的业务规则，需要具有Service和Position的项目以及Position的OrganizationUnit是可选的，因此我检查它是否不为null. 这是我的解决方案:

So I figure out how I can make this work. In specific repository class I made few foreach loops that set EntityState to modified. By our business rules Project required to have Service and Position and OrganizationUnit for Position is optional so I check if it's not null. Here is my solution:

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，当我想在任何级别上更新对象时，它将在数据库中更新.

Now when I want to update my object on any level it will update in my DB.

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