Entity Framework Core - Audit - vb.net

Question

Is there a way to write an Audit log automatically?
I have created a DbSet(Of Protocols)
Here is my protocol class:
Public Class Protocol
Inherits ModelBase
Implements ILogicalTimestamp
<Key>
Public Property ProtocolId As Integer
<Required>
Public Property ProtocolText As String
Public Property CreatedByUserId As Integer?
<Required>
Public Property CreatedByUser As User
<Required>
<DefaultValue(0)>
Public Property Type As ProtocolType
Public Property LinkedToUserId As Integer?
Public Property LinkedToUser As User
Public Property LinkedToBusinessPartnerId As Integer?
Public Property LinkedToBusinessPartner As BusinessPartner
Public Property LinkedToClientId As Integer?
Public Property LinkedToClient As Client
Public Property LinkedToSettingId As Integer?
Public Property LinkedToSetting As Setting
Public Property LastUpdateTimestamp As Date? Implements ILogicalTimestamp.LastUpdateTimestamp
Public Property CreationTimestamp As Date? Implements ILogicalTimestamp.CreationTimestamp
Public Enum ProtocolType
AutoChanges = 0
Explicitly = 1
End Enum
End Class
How can i write changes in protocol?
And how can i get the current UserId into the SaveChanges method to fill CreatedByUserId property in my protocol class?
Maybe anyone has an idea to do that automatically.

Answer 1

You can create a custom DB Context inheriting from DbContext, and then override the SaveChanges() method, so you can manipulate the data before/after modification.
Or you can use a library like Audit.EntityFramework, or check its code (C# sorry).
Also the library EntityFramework-Plus can probably help.