Entity Framework override SaveChanges() on Service layer instead of Data layer (different projects)
asp.net asp.net-web-api entity-framework entity-framework-6
Question
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?
Accepted Answer
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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