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我从数据库加载模型实例,将更改应用到它,但是当我想更新的变化,验证异常的发生在模型定义中设置为[Required]
的外键项目。我找到了解决办法,但我不知道什么是解决此问题的正确方法?
详情:
我有如下的模型:
public class Project
{
public int Id { get; set; }
[Required]
[StringLength(100, MinimumLength = 5]
public string Name { get; set; }
[Required]
public virtual ApplicationUser Client { get; set; }
[Key]
[ForeignKey("Client")]
public string ClientID;
[Required]
public virtual ApplicationUser ProjectManager { get; set; }
[Key]
[ForeignKey("ProjectManager")]
public string ProjectManagerID;
[Range(0,100)]
[Required]
public int Progress { get; set; }
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime CreateDate { get; set; }
[Column("Disabled")]
public bool Disabled{ get; set; }
[Column("Status")]
public string Status{ get; set; }
}
每当我获取从数据库模型信息到实例的更改应用到它,我面对的例外,大约需要ProjectManager
和Client
。
Project currentProject = (from prj in dbContext.Projects
where prj.Id == project.Id).Single();
//---> currentProject.ProjectManagerID is null
//---> currentProject.ClientID is null
//---> currentProject.ProjectManager is present
//---> currentProject.Client is present
currentProject.Name = ....
currentProject.Progress = ....
currentProject.Status = ....
currentProject.Disabled = ....
dbContext.Entry(currentProject).State = System.Data.Entity.EntityState.Modified;
dbContext.SaveChanges(); //--> Validation error for required Client,ProjectManager
这是事实,当我从数据库,客户端ID和ProjectManagerID立朗科技信息为空造成的,如果我手动设置如下,这将解决:
currentProject.Name = project.Name;
currentProject.Progress = project.Progress;
currentProject.Status = project.Status;
currentProject.Disabled = project.Disabled;
currentProject.ProjectManagerID = currentProject.ProjectManager.Id;
currentProject.ClientID = currentProject.Client.Id;
try
{
dbContext.Entry(currentProject).State = System.Data.Entity.EntityState.Modified;
dbContext.SaveChanges();
}
catch (DbEntityValidationException e)
{
addValidationErrorsToModelState(e);
return View(project);
}
我怀疑到virtual
设置但不确定,因为外部对象被加载,但他们的ID为空。
P.S.我宣布AppDbContext项目如下:
public DbSet<Project> Projects { get; set; }