private void ConditionallyNullForeignKeyProperties(
InternalEntityEntry dependentEntry,
InternalEntityEntry principalEntry,
IForeignKey foreignKey)
{
var principalProperties = foreignKey.PrincipalKey.Properties;
var dependentProperties = foreignKey.Properties;
var hasOnlyKeyProperties = true;
if (principalEntry != null &&
principalEntry.EntityState != EntityState.Detached)
{
for (var i = 0; i < foreignKey.Properties.Count; i++)
{
if (!PrincipalValueEqualsDependentValue(
principalProperties[i],
dependentEntry[dependentProperties[i]],
principalEntry[principalProperties[i]]))
{
return;
}
if (!dependentProperties[i].IsKey())
{
hasOnlyKeyProperties = false;
}
}
}
for (var i = 0; i < foreignKey.Properties.Count; i++)
{
if (!dependentProperties[i].IsKey())
{
dependentEntry[dependentProperties[i]] = null;
dependentEntry.StateManager.UpdateDependentMap(dependentEntry, foreignKey);
dependentEntry.SetRelationshipSnapshotValue(dependentProperties[i], null);
}
}
if (foreignKey.IsRequired &&
hasOnlyKeyProperties &&
dependentEntry.EntityState != EntityState.Detached)
{
switch (dependentEntry.EntityState)
{
case EntityState.Added:
dependentEntry.SetEntityState(EntityState.Detached);
DeleteFixup(dependentEntry);
break;
case EntityState.Unchanged:
case EntityState.Modified:
dependentEntry.SetEntityState(EntityState.Deleted);
DeleteFixup(dependentEntry);
break;
}
}
}