Question

So I use this role:

DropCreateDatabaseIfModelChanges

But theres one table that I to preserve its data..
So is there a way to exclude one table or to preserve one table data?

Answer 1

No, there is no way to exclude a table, because as the name implies it will Drop the whole database.

However you can inherit from the intializer and override the seed method to reinsert your data:

public class MyInitializer : DropCreateDatabaseIfModelChanges<MyContext>
{
    protected override void Seed(MyContext context)
    {
        //insert data to tables through context
    }
}

If you want something more complex you need to implement IDatabaseInitializer<TContext> directly, something like:

public class MyComplexInitializer : IDatabaseInitializer<MyContext>
{ 
    public void InitializeDatabase(MyContext context)
    {
        if (context.Database.Exists())
        {
             if (context.Database.CompatibleWithModel(true))
                 return;
             //do something bofore delete
             context.Database.Delete();
        }
        context.Database.Create();
        //add some data to context
        context.SaveChanges();                 
    }
}