NHibernate“错误脱水属性值..“ ”对象与目标类型不匹配”
本文关键字:对象 类型 不匹配 目标 错误 属性 NHibernate | 更新日期: 2023-09-27 18:31:53
这是我的设置...
类/接口:
IEntity
User : IEntity
Vehicle : IEntity
我正在使用Fluent NHibernate进行设置。
我正在尝试做的是保存每个实体类的已创建、创建者、更新和更新程序。
我有这些 NHibernate 侦听器来完成此操作:
public class NHibernateListener : IPreInsertEventListener, IPreUpdateEventListener
{
private static readonly string CreatedPropertyName = GetPropertyName<IEntity>(val => val.Created);
private static readonly string CreatorPropertyName = GetPropertyName<IEntity>(val => val.Creator);
private static readonly string UpdatedPropertyName = GetPropertyName<IEntity>(val => val.Updated);
private static readonly string UpdaterPropertyName = GetPropertyName<IEntity>(val => val.Updater);
public bool OnPreInsert(PreInsertEvent @event)
{
IEntity entity;
if ((entity = @event.Entity as IEntity) != null)
{
var currentDate = DateTime.Now;
entity.Created = entity.Updated = currentDate;
if (User.CurrentUser != null)
{
entity.Creator = entity.Updater = User.CurrentUser;
Set(@event.Persister, @event.State, CreatorPropertyName, currentDate);
Set(@event.Persister, @event.State, UpdaterPropertyName, currentDate);
}
Set(@event.Persister, @event.State, CreatedPropertyName, currentDate);
Set(@event.Persister, @event.State, UpdatedPropertyName, currentDate);
}
return false;
}
public bool OnPreUpdate(PreUpdateEvent @event)
{
IEntity entity;
if ((entity = @event.Entity as IEntity) != null)
{
var currentDate = DateTime.Now;
entity.Updated = currentDate;
if (User.CurrentUser != null)
{
entity.Creator = entity.Updater = User.CurrentUser;
Set(@event.Persister, @event.State, UpdaterPropertyName, currentDate);
}
Set(@event.Persister, @event.State, UpdatedPropertyName, currentDate);
}
return false;
}
private void Set(IEntityPersister persister, object[] state, string propertyName, object value)
{
var index = Array.IndexOf(persister.PropertyNames, propertyName);
if (index == -1)
return;
state[index] = value;
}
private static string GetPropertyName<TType>(Expression<Func<TType, object>> expression)
{
return ExpressionProcessor.FindPropertyExpression(expression.Body);
}
}
Created
和Updated
工作正常。创建者和更新程序不起作用。
类
目录
public enum Status
{
Active,
Inactive
}
public interface IEntity
{
Guid Id { get; }
DateTime Created { get; set; }
User Creator { get; set; }
DateTime Updated { get; set; }
User Updater { get; set; }
Status Status { get; set; }
}
用户 - 请注意,有一个名为 CurrentUser
的静态Property
,其类型为 User
。
public class User : IEntity
{
public static User CurrentUser { get; set; }
public virtual string Email { get; protected set; }
public virtual Guid Id { get; protected set; }
public virtual DateTime Created { get; set; }
public virtual User Creator { get; set; }
public virtual DateTime Updated { get; set; }
public virtual User Updater { get; set; }
public virtual Status Status { get; set; }
public virtual string FirstName { get; protected set; }
public virtual string LastName { get; protected set; }
public virtual IEnumerable<Vehicle> Vehicles { get; protected set; }
protected User()
{
}
public User(Guid id, string email, string firstName, string lastName)
{
Id = id;
FirstName = firstName;
LastName = lastName;
Email = email;
}
public virtual void AddVehicle(Vehicle vehicle)
{
((IList<Vehicle>) Vehicles).Add(vehicle);
vehicle.AddUser(this);
}
}
车辆
public class Vehicle : IEntity
{
protected Vehicle()
{
}
public Vehicle(Guid id, string make, string model, string color)
{
Id = id;
Make = make;
Model = model;
Color = color;
Users = new List<User>();
}
public virtual string Make{ get; set; }
public virtual string Model{ get; set; }
public virtual string Color { get; set; }
public virtual IEnumerable<User> Users { get; protected set; }
public virtual Guid Id { get; set; }
public virtual DateTime Created { get; set; }
public virtual User Creator { get; set; }
public virtual DateTime Updated { get; set; }
public virtual User Updater { get; set; }
public virtual Status Status { get; set; }
protected internal virtual void AddUser(User user)
{
((IList<User>) Users).Add(user);
}
}
我正在使用自动映射,这两个类没有覆盖。
当我运行时,当事务尝试提交时,我收到以下错误:
Message: Error dehydrating property value for MyApp.Domain.Users.User.Creator
Inner Exception: Exception occurred getter of MyApp.Domain.Users.User.Id
Inner Inner Exception: Object does not match target type.
这两
行对我来说看起来不太好:
Set(@event.Persister, @event.State, CreatorPropertyName, currentDate);
Set(@event.Persister, @event.State, UpdaterPropertyName, currentDate);
他们甚至应该在那里吗?