我有一个MVVM应用程序,允许用户将记录标记为已删除
public void DeleteRecord(object p)
{
db.entry((MyEntityCast)p).state = EntityState.Deleted;
((DelegateCommand)ICommandSave).RaiseCanExecuteChanged();
}
然后我使用canExecute:
保存ICommandSave
public bool canExecuteSave(object param)
{
decimal count = (from c in MyList
select c).Count(x=> db.Entry(x).State != EntityState.Unchanged);
return count !=0;
}
我的问题是,计数总是返回ListaTipoAsociado
少删除的ítems,这意味着
如果MyList.count = 5
,并且用户标记为删除2Ítems,则此查询返回0
,MyList.count
将新值设置为3
。
我的问题是?
为什么如果记录只有marked
进行删除(尚未删除),我无法在查询中访问它们?
我缺少 EF 设置?
更新2: MyList定义
private ObservableCollection<MyEntity> _MyList;
public ObservableCollection<MyEntity> MyList
{
get { return _MyList; }
set { SetProperty(ref _MyList, value); }
}
public constructor()
{
var Q= from ta in db.MyEntity
select ta;
MyList= new ObservableCollection<MyEntity>(Q.ToList());
}
更新3:类定义
public partial class MyEntity
{
public MyEntity()
{
this.Childs = new HashSet<MyEntity2>();
}
public int IntTipoAsociado { get; set; }
public string StrDescripcionTipoAsociado { get; set; }
public virtual ICollection<MyEntity2> MyEntity2{ get; set; }
}
上下文:
public partial class MyEntities : DbContext
{
public MyEntities()
: base("name=MyEntities")
{
}
public MyEntities(string connectioString)
: base(connectioString)
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public DbSet<MyEntity> MyEntity { get; set; }
public DbSet<MyEntity2> MyEntity { get; set; }
}