Entity Framework Core：检测 model 中的变化

Question

I have model

public class BBDB
{
    [Key]
    [ForeignKey("Person")]
    public int Id { get; set; }

    [CanBeNull]
    public string City { get; set; }
}

And added new property. My model become:

public class BBDB
{
    [Key]
    [ForeignKey("Person")]
    public int Id { get; set; }

    [CanBeNull]
    public string City { get; set; }

    [NotNull]
    public string Date { get; set; }
}

I need to check using dbcontext that this changes exist. So, ".ChangeTracker.HasChanges()" doesn't allow me to do this. Add-migration create code to make changes. How can I check that we have changes?

Answer 1

Ok It is very easy in the end...

Context.Database.Initialize

This solve our problem If there are changes in model that we don't migrate, it crashes with message:

System.Data.Entity.Migrations.Infrastructure.AutomaticMigrationsDisabledException: Unable to update database to match the current model because there are pending changes and automatic migration is disabled. Either write the pending model changes to a code-based migration or enable automatic migration. Set DbMigrationsConfiguration.AutomaticMigrationsEnabled to true to enable automatic migration