public void OnChange(BRecord entity, UpdateOperations operation)
{
switch (operation)
{
case UpdateOperations.Add:
case UpdateOperations.Change:
entity.ChangedDate = DateTime.Now;
break;
}
}
static void Main(string[] args)
{
var ctx = new ConcurrencyTestDataContext();
var entityA = new ARecord {
Value = "[0] created payload"
};
ctx.ARecords.Add(entityA);
ctx.SaveChanges();
entityA.Value = string.Format("[1] updated payload at {0}", DateTime.Now);
ctx.SaveChanges();
entityA.Value = string.Format("[2] updated payload at {0}", DateTime.Now);
ctx.SaveChanges();
var entityB = new BRecord {
Value = "[0] created payload"
};
ctx.BRecords.Add(entityB);
ctx.SaveChanges();
entityB.Value = string.Format("[1] updated payload at {0}", DateTime.Now);
ctx.SaveChanges();
entityB.Value = string.Format("[2] updated payload at {0}", DateTime.Now);
ctx.SaveChanges();
var entityC = new CRecord {
Value = "[0] created payload"
};
ctx.CRecords.Add(entityC);
ctx.SaveChanges();
entityC.Value = string.Format("[1] updated payload at {0}", DateTime.Now);
ctx.SaveChanges();
entityC.Value = string.Format("[2] updated payload at {0}", DateTime.Now);
ctx.SaveChanges();
var newContext = new ConcurrencyTestDataContext();
entityC.Value = string.Format("[3] updated payload at {0} via new data context", DateTime.Now);
newContext.Attach(entityC);
newContext.SaveChanges();
}
public FrmOperationRecord(AdminMsg LoginMsg)
{
InitializeComponent();
BRecord = new BRecord(LoginMsg.SqlConn);
TheUser = LoginMsg;
}
private void OnDetach(BRecord entity)
{
}
public void Detach(BRecord entity)
{
BRecords.Detach(entity);
}
private BRecord AttachWithRelations(BRecord entity, InsertMode insertMode = InsertMode.Attach, MergeOption mergeOption = MergeOption.AppendOnly, List <object> referenceTrackingList = null)
{
#region iteration tracking
if (ReferenceEquals(null, referenceTrackingList))
{
referenceTrackingList = new List <object>();
}
if (referenceTrackingList.Contains(entity))
{
return(_bRecords.GetExisting(entity));
}
else
{
referenceTrackingList.Add(entity);
}
#endregion
#region add/attach entity
BRecord existingEntity = null;
switch (insertMode)
{
case InsertMode.Add:
existingEntity = _bRecords.Add(entity);
break;
case InsertMode.Attach:
existingEntity = _bRecords.Attach(entity);
break;
default:
throw new Exception(string.Format("Implementation Exception: missing action for {0}", insertMode));
}
if (!ReferenceEquals(null, existingEntity) && ReferenceEquals(existingEntity, entity))
{
return(existingEntity);
}
#endregion
#region attach relations recursively
#endregion
#region refresh existing entity based on merge options
if (!ReferenceEquals(null, existingEntity) && !ReferenceEquals(existingEntity, entity))
{
if (BRecords.MergeOption == MergeOption.OverwriteChanges)
{
Invoke(delegate
{
existingEntity.Refresh(entity, trackChanges: false);
existingEntity.AcceptChanges();
});
}
else if (BRecords.MergeOption == MergeOption.PreserveChanges)
{
Invoke(delegate
{
existingEntity.Refresh(entity, trackChanges: false, preserveExistingChanges: true);
});
}
}
#endregion
return(existingEntity);
}
public void AttachAsModified(BRecord entity, BRecord original)
{
BRecords.AttachAsModified(entity, original);
}
public void Attach(BRecord entity)
{
BRecords.Attach(entity);
}
public void Delete(BRecord entity)
{
BRecords.Delete(entity);
}
public void Add(BRecord entity)
{
BRecords.Add(entity);
}
public Point(BRecord brec)
{
Latitude = brec.Latitude;
Longitude = brec.Longitude;
Altitude = brec.GnssAltitude;
}
