我无法为我的实体定义我的模型构建器,并在尝试设置该实体的当前值时抛出错误。引起问题的线路如下:
context.Entry(tEntity.TaskSchedule.ScheduleDaysAndTimes).CurrentValues.SetValues(selectedTask.TaskSchedule.ScheduleDaysAndTimes);
我正在抛出'实体类型EntityCollection`1不是当前上下文模型的一部分。'
继承我的设置:
public class TaskEntity
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public virtual int TaskId { get; set; }
public virtual TaskScheduleEntity TaskSchedule { get; set; }
}
public class TaskScheduleEntity
{
/*Foreign Key*/
public virtual int TaskId { get; set; }
public virtual TaskEntity TaskEntity { get; set; }
public virtual ICollection<ScheduleDayTimeEntity> ScheduleDaysAndTimes { get; set; }
public class ScheduleDayTimeEntity
{
public int TaskScheduleID { get; set; }
public virtual TaskScheduleEntity TaskScheduleEntity { get; set; }
public virtual ICollection<DateTime?> Times { get; set; }
}
modelBuilder.Entity<TaskEntity>()
.HasKey(k => k.TaskId)
.HasRequired(s => s.TaskSchedule)
.WithRequiredPrincipal(p => p.TaskEntity)
.WillCascadeOnDelete(true);
modelBuilder.Entity<TaskScheduleEntity>()
.HasKey(k => k.TaskId)
.HasMany(t => t.ScheduleDaysAndTimes)
.WithRequired(a => a.TaskScheduleEntity)
.WillCascadeOnDelete(false);
modelBuilder.Entity<ScheduleDayTimeEntity>()
.HasKey(k => k.TaskScheduleID);
public void SaveTasks()
{
using (var context = new AppContext())
{
var tEntity = context.Tasks.First(x => x.TaskId == selectedTask.TaskId);
context.Entry(tEntity).CurrentValues.SetValues(selectedTask);
context.Entry(tEntity.TaskSchedule).CurrentValues.SetValues(selectedTask.TaskSchedule);
context.Entry(tEntity.TaskSchedule.ScheduleDaysAndTimes).CurrentValues.SetValues(selectedTask.TaskSchedule.ScheduleDaysAndTimes); /* Error thrown here*/
context.SaveChanges();
}
}
答案 0 :(得分:2)
DbContext.Entry()期待一个实体,并且你给它一个ICollection<ScheduleDayTimeEntity>
您需要更新代码,以便遍历集合:
foreach (var scheduleDayTimeEntity in tEntity.TaskSchedule.ScheduleDaysAndTimes)
{
context.Entry(scheduleDayTimeEntity).CurrentValues.SetValues(/* Correct Value goes here */ );
}