EntityFramework 7添加实体时出错

Question

I'm getting the following error when trying to add a new entity to an Entity Framework data context.

An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code

Additional information: Invalid object name 'DefaultSequence'.

I have no idea where DefaultSequence is coming from. When the add method is executed I can see it query SQL server something like select next result from DefaultSequence (I don't have that in front of me right now, but something like that was the query that was executed.

Here is the code that I'm using to add the entity and the error is happening on the .Add line:

public IActivityCode Create(ActivityCode item)
    {
        data.ActivityCode.Add(item);
        data.SaveChanges();

        return Get(item.Id);
    }

Here is the code for the DbContext

public class MyDbContext : DbContext
{

    public DbSet<ActivityCode> ActivityCode { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer(Startup.Configuration.Get("Data:DefaultConnection:ConnectionString"));
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<ActivityCode>().ForSqlServer((builder => builder.Table("ActivityCode", "Payments")));

        base.OnModelCreating(modelBuilder);
    }
}

Answer 1

I needed to do the below to get this to work. The comment Jurgen was close, but didn't work as posted, but if you want to post as answer I will accept that as an answer as well.

    modelBuilder.Entity<ActivityCode>().ForSqlServer(builder => builder.Table("ActivityCode", "Payments"));
    modelBuilder.Entity<EquityActivity>().ForSqlServer(builder => builder.Table("EquityActivity", "Equity"));
    modelBuilder.ForSqlServer().UseIdentity();