C# 第一次需要附加另一个预先存在的实体时，如何保存该实体

我需要将公司实体作为新实体保存到数据库中。为了做到这一点，我需要将CompanyType实体与Company实体相关联。不这样做我就救不了公司。我是否将新创建的公司附加到上下文，然后将公司类型实体附加到公司，然后保存结果？这个代码可以工作…但感觉不太对劲

public RepositoryStatus SaveCompany(Company company, CompanyType companyType)
    {
        RepositoryStatus rs = new RepositoryStatus();
        try
        {
            using (RanchBuddyEntities dc = new Connection().GetContext())
            {
                if (company.CompanyID > 0)
                {
                    company.UpdateDate = DateTime.Now;
                    Company original = dc.CompanySet.Where(c => c.CompanyID == company.CompanyID).FirstOrDefault();
                    dc.ApplyPropertyChanges("CompanySet", company);
                    dc.Attach(companyType);
                    company.CompanyTypesReference.Attach(companyType);
                }
                else
                {
                    company.CreateDate = DateTime.Now;
                    company.UpdateDate = DateTime.Now;
                    dc.AddToCompanySet(company);
                    dc.Attach(companyType);
                    company.CompanyTypesReference.Value = companyType;
                }
                dc.SaveChanges();
            }
            rs.SetObject(company);
            rs.StatusType = Status.StatusTypes.Success;
        }
        catch (Exception e)
        {
            rs.SetObject(company);
            rs.StatusType = Status.StatusTypes.Failure;
            rs.AddMessage(e.Message + Environment.NewLine + e.StackTrace);
        }

        return rs;
    }

CompanyType被附加到另一个上下文并被分离，这就是它被传递到这里的原因。在同一using语句中传入CompanyTypeID并查询关联对象是否更好

我无法忍受我必须采取这么多步骤才能让EF进入LINQ到SQL如此简单的地方！仍然-EF似乎比NHibernate更容易

我是这样做的：

Company company = new Company();
company.CreateDate = DateTime.Now;
company.UpdateDate = DateTime.Now;
company.CompanyType = companyType;
RanchBuddyEntities.AddToCompanies(company);
RanchBuddyEntities.SaveChanges();

我是这样做的：

Company company = new Company();
company.CreateDate = DateTime.Now;
company.UpdateDate = DateTime.Now;
company.CompanyType = companyType;
RanchBuddyEntities.AddToCompanies(company);
RanchBuddyEntities.SaveChanges();