//1 默认情况下,导航属性是延迟查询;
//条件是virtaul属性+默认配置
using (JDDbContext dbContext = new JDDbContext())
{
var companyList = dbContext.
11-01
317

10-25
409

10-21
305

10-10
577

10-09
572

10-08
456
