<分区>
当我尝试保存对上下文所做的更改时，我不断收到以下错误:
Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.
我有以下类(class):
人物
public class Person : IPerson
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Name
{
get
{
return FirstName + " " + LastName;
}
set{}
}
public string Email { get; set; }
public DateTime? LastModified { get; set; }
public virtual ICollection<Result> Results { get; set; }
}
用户资料
public class UserProfile : Person
{
public UserProfile()
{
Faculty = new Faculty();
Projects = new Collection<Project>();
Results = new Collection<Result>();
}
public string UserName { get; set; }
public string CNP { get; set; }
public virtual Faculty Faculty { get; set; }
public virtual ICollection<Project> Projects { get; set; }
}
结果
public abstract class Result:INamedEntity
{
protected Result()
{
ResultType = new ResultType();
}
public int Id { get; set; }
public string Name{get;set;}
public virtual ResultType ResultType { get; set; }
public virtual ICollection<Person> People { get; set; }
public DateTime? LastModified { get; set; }
}
在我使用以下方法向上下文添加值之后:
_ctx.Users.Single(u => u.Id == userId).Results.Add(result);
调用 _ctx.SaveChanges() 时出现错误
将我的函数更新为:
public bool Save()
{
try
{
_ctx.SaveChanges();
}
catch (OptimisticConcurrencyException)
{
((IObjectContextAdapter)_ctx).ObjectContext.Refresh(RefreshMode.ClientWins,_ctx.Users);
((IObjectContextAdapter)_ctx).ObjectContext.Refresh(RefreshMode.ClientWins,_ctx.Results);
_ctx.SaveChanges();
}
return true;
}
但是错误没有被捕获。 谢谢