.NET Core 2 – EF Core Error handling Save changes

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Looking through the GitHub issues, there is no DbEntityValidationException equivalent in Entity Framework Core. There’s a blog post (linked from issue #9662 on GitHub), that gives a code example for performing the validation logic yourself, included here for completeness:

class MyContext : DbContext
{
    public override int SaveChanges()
    {
        var entities = from e in ChangeTracker.Entries()
                       where e.State == EntityState.Added
                           || e.State == EntityState.Modified
                       select e.Entity;
        foreach (var entity in entities)
        {
            var validationContext = new ValidationContext(entity);
            Validator.ValidateObject(entity, validationContext);
        }

        return base.SaveChanges();
    }
}

Validator.ValidateObject will throw a ValidationException if validation fails, which you can handle accordingly.

There’s a bit more information in the linked issue in case you run into issues with the validation attributes.

Note: The Validator class is located in the System.ComponentModel.DataAnnotations namespace.

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