internal void RevertEntityToUnmodified(BaseRepository repository)
{
if ((_entity is INotifyPropertyChanged)
&& ! _propertyChanged)
{
// Shortcut exit - if not INPC events were raised, nothing should be changed.
return;
}
if ((_unmodifiedStructuralPropertyValues == null)
|| (_unmodifiedNavigationPropertyValues == null))
{
// It's not possible to revert
throw new InvalidOperationException("Can't Revert because the entity's unmodified state was not captured.");
}
// Restore the unmodified property values
for (int i = 0; i < _unmodifiedNavigationPropertyValues.Length; ++i)
{
PropertyInfo property = _entityTypeInfo.NavigationProperties[i];
// Check each property value before setting it - only set properties that need to change
object currentValue = property.GetValue(_entity, null);
if (! Equals(currentValue, _unmodifiedNavigationPropertyValues[i]))
{
object revertToValue = _unmodifiedNavigationPropertyValues[i];
property.SetValue(_entity, revertToValue, null);
repository.DataServiceContext.SetLink(_entity, property.Name, revertToValue);
}
}
for (int i = 0; i < _unmodifiedStructuralPropertyValues.Length; ++i)
{
PropertyInfo property = _entityTypeInfo.StructuralProperties[i];
property.SetValue(_entity, _unmodifiedStructuralPropertyValues[i], null);
}
// Set the state to unmodified in the DataServiceContext
repository.DataServiceContext.ChangeState(_entity, EntityStates.Unchanged);
// Set link collections, if any, to unmodified
foreach (var linkCollectionTracker in _linkCollectionTrackers)
{
if (linkCollectionTracker != null)
{
linkCollectionTracker.RevertLinksToUnmodified();
}
}
_propertyChanged = false;
}
/// <summary>
/// Determine if the object is changed; and set the DataServiceContext state accordingly.
/// </summary>
/// <param name="repository"></param>
internal void ReportChanges(BaseRepository repository)
{
EntityDescriptor ed = repository.DataServiceContext.GetEntityDescriptor(_entity);
Debug.Assert(ed != null, "No EntityDescriptor for " + _entity);
if ((ed.State == EntityStates.Unchanged) || (ed.State == EntityStates.Modified))
{
if (_propertyChanged || !(_entity is INotifyPropertyChanged))
{
// Only run this block if there's a chance a property has changed,
// and if changed values will affect whether the entity is saved.
if (AreStructuralPropertiesUnmodified())
{ // Record the entity as Unmodified
if (ed.State != EntityStates.Unchanged)
{
repository.DataServiceContext.ChangeState(_entity, EntityStates.Unchanged);
}
}
else if (ed.State == EntityStates.Unchanged)
{ // Record the entity as Modified
repository.DataServiceContext.UpdateObject(_entity);
}
// Set links for navigation properties that have changed
for (int i = 0; i < _unmodifiedNavigationPropertyValues.Length; ++i)
{
PropertyInfo property = _entityTypeInfo.NavigationProperties[i];
// Check each property value before setting it - only set properties that need to change
object currentValue = property.GetValue(_entity, null);
if (! Equals(currentValue, _unmodifiedNavigationPropertyValues[i]))
{
repository.DataServiceContext.SetLink(_entity, property.Name, currentValue);
}
}
}
}
else if (ed.State == EntityStates.Added)
{
// Set links for all navigation properties
foreach (PropertyInfo navProperty in _entityTypeInfo.NavigationProperties)
{
object currentValue = navProperty.GetValue(_entity, null);
if (currentValue != null)
{
// This may be unecessary, but if currentValue is already being tracked it will return immediately.
// This is necessary if _entity doesn't implement INotifyPropertyChanged, and currentValue is new.
_oDataClient.AddEntityGraph(currentValue);
repository.DataServiceContext.SetLink(_entity, navProperty.Name, currentValue);
}
}
}
// Delegate reporting of link collection changes
foreach (var linkCollectionTracker in _linkCollectionTrackers)
{
if (linkCollectionTracker != null)
{
linkCollectionTracker.ReportChanges(repository.ODataClient);
}
}
}
