public virtual EntityChangeSet CreateEntityChangeSet(ICollection <EntityEntry> entityEntries)
{
var changeSet = new EntityChangeSet
{
UserId = BysSession.GetUserId() ?? 0,
UserName = BysSession.UserName,
};
foreach (var entry in entityEntries)
{
if (!ShouldSaveEntityHistory(entry))
{
continue;
}
var entityChangeInfo = CreateEntityChangeInfo(entry);
if (entityChangeInfo == null)
{
continue;
}
changeSet.EntityChanges.Add(entityChangeInfo);
}
return(changeSet);
}
/// <summary>
/// Updates change time, entity id and foreign keys after SaveChanges is called.
/// </summary>
public void UpdateChangeSet(EntityChangeSet changeSet)
{
foreach (var entityChangeInfo in changeSet.EntityChanges)
{
/* Update change time */
entityChangeInfo.ChangeTime = GetChangeTime(entityChangeInfo);
/* Update entity id */
var entityEntry = entityChangeInfo.EntityEntry.As <EntityEntry>();
entityChangeInfo.EntityId = GetEntityId(entityEntry.Entity);
/* Update foreign keys */
var foreignKeys = entityEntry.Metadata.GetForeignKeys();
foreach (var foreignKey in foreignKeys)
{
foreach (var property in foreignKey.Properties)
{
var propertyEntry = entityEntry.Property(property.Name);
var propertyChange = entityChangeInfo.PropertyChanges.FirstOrDefault(pc => pc.PropertyName == property.Name);
if (propertyChange == null)
{
if (!(propertyEntry.OriginalValue?.Equals(propertyEntry.CurrentValue) ?? propertyEntry.CurrentValue == null))
{
// Add foreign key
entityChangeInfo.PropertyChanges.Add(
new EntityPropertyChange
{
NewValue = propertyEntry.CurrentValue.SafeToString(),
OriginalValue = propertyEntry.OriginalValue.SafeToString(),
PropertyName = property.Name,
PropertyTypeFullName = property.ClrType.FullName
});
}
continue;
}
if (propertyChange.OriginalValue == propertyChange.NewValue)
{
var newValue = propertyEntry.CurrentValue.SafeToString();
if (newValue == propertyChange.NewValue)
{
// No change
entityChangeInfo.PropertyChanges.Remove(propertyChange);
}
else
{
// Update foreign key
propertyChange.NewValue = newValue;
}
}
}
}
}
}
public static async Task SaveAsync(IUnitOfWork unitOfWork, EntityChangeSet entityChangeSet)
{
await unitOfWork.Context.SaveChangesAsync();
}