代码不会抛出错误，但没有添加数据

Question

我有一个表单，允许用户更新并创建新的数据库条目，我可以更新但不能创建。以下是dal

if (actionrequired == Crud.Modify)
{
                    t_ProvisionSetup setupToBeChanged = (from p in Entities.t_ProvisionSetup
                                                         where p.ProvisionSetupId == provision.ProvisionSetupId
                                                         select p).Single();
                    setupToBeChanged.ModifiedOn = DateTime.UtcNow;
                    setupToBeChanged.ModifiedBy = userId;
                    setupToBeChanged = MapSetupToEntity(provision, setupToBeChanged);
                    Entities.SaveChanges();
                    setupid = setupToBeChanged.ProvisionSetupId;
}

if (actionrequired == Crud.Add)
{
                    t_ProvisionSetup setupToBeChanged = new t_ProvisionSetup();
                    setupToBeChanged = MapSetupToEntity(provision, setupToBeChanged);
                    setupToBeChanged.ModifiedBy = userId;
                    setupToBeChanged.ModifiedOn = DateTime.UtcNow;
                    setupToBeChanged.CreatedBy = userId;
                    setupToBeChanged.CreatedOn = DateTime.UtcNow;

                    Entities.SaveChanges();
                    setupid = setupToBeChanged.ProvisionSetupId;
}

它运行良好，没有错误，但不会创建新记录。

Answer 1

也许你需要这样的东西？

Entities.t_ProvisionSetup.Add(setupToBeChanged);

在调用 Entities.SaveChanges() 之前。