Entity Framework override SaveChanges() on Service layer instead of Data layer (different projects)

My ASP.NET WebAPI application has Data & Service layer, multiple projects in one solution.

Data Layer (Entity Framework)
-DbContext.cs

Service Layer (Business Logic)
-Controller.cs
-Global.asax


One of my entities requires business logic intercept every time it run DbContext SaveChanges().

public class MyDbContext : DbContext


public override int SaveChanges()

BusinessLogicAndUpdateEntity(); //Code from Service Layer
return base.SaveChanges();




Currently the business logic resides in service layer, and data project can't reference service layer project else the project will be circular referencing each other.

Is there a way for me to override DbContext SaveChanges() in service layer without moving my business logic to the data layer?

1 Answer
1

You could fire an event in MyDbContext (maybe it already exists in DbContext?)

public delegate void BeforeSaveChangesSignature ();
public class MyDbContext : DbContext

public event BeforeSaveChangesSignature BeforeSaveChanges get; set;

public override int SaveChanges()

BeforeSaveChanges?.Invoke();
return base.SaveChanges();




Your business logic would then subscribe the event, and performing whatever they need:

...
var context = new MyDbContext();
context.BeforeSaveChanges += () => Console.WriteLine("Before save");
...


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