最好的方法将取决于您的依赖关系。 POCO /核心组件是否依赖于EF? 您是否将Access数据库注入到您的核心库程序集?等等。
我个人使用repository/luw模式,其中各种资源库对象都从通用的基础资源库对象继承而来。 DAL依赖于EF,但核心中的POCO类不会。
存储库子类有一个特定的类型,并进行OTHER OBEJCT业务检查。 需要检查其他实体的IE业务规则,我在DAL中实现。
存储库类属于数据访问层项目和DO有依赖于EF和注入上下文。下面的例子。
检查特定于我在POCO上执行的实例。 需要访问数据库的检查我通过在基类Class respository类上实现的接口执行此类接口,该接口类需要重写。所以现在调用CheckEntity被触发时,加或改变一个对象。
如 ...注意一些代码去除,以保持例如有关...
public class RepositoryEntityBase<T> : IRepositoryEntityBase<T>, IRepositoryEF<T> where T : BaseObject
public virtual OperationStatus Add(T entity)
{
var opStatus = new OperationStatus(status: true, operation: OperationType.Add);
try
{
if (OnBeforeAdd != null) // registered listeners of added event?
{
var evtArg = PrepareEventArgs(entity, MasterEventType.Create);
OnBeforeAdd(this, evtArg);
}
opStatus = CheckBeforePersist(entity);
if (opStatus.Status)
{
Initialize(entity);
EntityDbSet.Add(entity);
if (OnAfterAdd != null) // registered listeners of added event?
{
var evtArg = PrepareEventArgs(entity, MasterEventType.Create);
OnAfterAdd(this, evtArg);
}
}
}
catch (Exception ex)
{
opStatus.SetFromException("Error Adding " + typeof(T), ex);
}
return opStatus;
}
//... then in a specific repository class
//... irepositorybase expects Check before persist.
public override OperationStatus CheckBeforePersist(MasterUser entity)
{
// base entity rule check first
var opStatus = new OperationStatus(true, OperationType.Check);
opStatus.ValidationResults = base.CheckEntity(entity);
if (opStatus.ValidationResults.Count > 0)
{
opStatus.Status = false;
opStatus.Message = "Validation Errors";
return opStatus;
}
//now check the local memory
var masterUser = Context.Set<MasterUser>().Local //in context
.Where(mu => mu.Id != entity.Id // not this record
&& mu.UserName == entity.UserName) // same name
.FirstOrDefault();
if (masterUser != null)
{
opStatus.Status = false;
opStatus.Message = "Duplicate UserName :" + masterUser.UserName + " UserId:"+ masterUser.Id.ToString();
return opStatus;
}
masterUser = Context.Set<MasterUser>().Local //in context
.Where(mu => mu.Id != entity.Id // not this record
&& mu.Email == entity.Email) // same email
.FirstOrDefault();
if (masterUser != null)
{
opStatus.Status = false;
opStatus.Message = "Duplicate Email :" + masterUser.Email + " Username:" + masterUser.UserName;
return opStatus;
}
// now check DB
masterUser = Get(mu => mu.Id != entity.Id //not this record being checked
&& mu.UserName == entity.UserName); // has same username
if (masterUser != null)
{
opStatus.Status = false;
opStatus.Message = "Duplicate UserName :" + masterUser.UserName + " UserId:"+ masterUser.Id.ToString();
return opStatus;
}
masterUser = Get(mu => mu.Id != entity.Id // not this record
&& mu.Email == entity.Email); // but same email
if (masterUser != null)
{
opStatus.Status = false;
opStatus.Message = "Duplicate Email:" + masterUser.Email + " UserName:"+ masterUser.UserName;
return opStatus;
}
return opStatus;
}
}
标志审查不是一个验证任务。这是商业逻辑。验证是检查这些发票是否已被标记为审查。一个小但重要的区别。验证不应该改变对象的状态。这并不改变你的问题的本质。 –