Audit trail with Entity Framework Core audit entity-framework-core sql-server


I have an ASP.NET core 2.0 using Entity Framework core on a SQL Server db.

I have to trace and audit all the stuff made by the users on the data. My goal is to have an automatic mechanism writing all what is happening.

For example, if I have the table Animals, I want a parallele table "Audit_animals" where you can find all the info about the data, the operation type (add, delete, edit) and the user who made this.

I already made this time ago in Django + MySQL, but now the environment is different. I found this and it seems interesting, but I'd like to know if there are better ways and which is the best approach to do this in EF Core.


I'm trying this and something happens, but I have some problems.

I added this:

  1. services.AddMvc().AddJsonOptions(options => {
                options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
  2. public Mydb_Context(DbContextOptions<isMultiPayOnLine_Context> options) : base(options)
            .ForContext<Mydb_Context>(config => config
  3. public MyRepository(Mydb_Context context)
        _context = context;
        _context.AddAuditCustomField("UserName", "pippo");

I also created a table to insert the audits (only one to test this tool), but the only thing I got is what you see in the image. A list of json files with the data I created.... why??

enter image description here

2/17/2018 4:31:39 AM

Accepted Answer

Read the documentation:

Event Output

To configure the output persistence mechanism please see Configuration and Data Providers sections.

Then, in the documentation on Configuration:

If you don't specify a Data Provider, a default FileDataProvider will be used to write the events as .json files into the current working directory. (emphasis mine)

Long and short, follow the documentation to configure the data provider you'd like to use.

2/14/2018 4:32:27 PM

Popular Answer

If you are going to map the audit table (Audit_Animals) to the same EF context as the audited Animals table, you can use the EntityFramework Data Provider included on the same Audit.EntityFramework library.

Check the documentation here:

Entity Framework Data Provider

If you plan to store the audit logs in the same database as the audited entities, you can use the EntityFrameworkDataProvider. Use this if you plan to store the audit trails for each entity type in a table with similar structure.

There is another library that can audit EF contexts in a similar way, take a look: zzzprojects/EntityFramework-Plus.

Cannot recommend one over the other since they provide different features (and I'm the owner of the library).

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