我试图加载的SingleOrDefault实体相关的实体,但我得到以下异常:如何加载IEnumerable类型的相关实体<T>
IEnumerable类型的导航属性不是一个单一的实现类型ICollection
我试过这样做了几种方式,并最终得到上述每个查询对上下文相同的错误(我已经包括在评论中的其他方式)。
using(var context = CustomObjectContextCreator.Create())
{
return context.Job.Include("Surveys").Include("SiteInfoes")
.Where(r => r.Jobid == jobId).SingleOrDefault();
//context.ContextOptions.LazyLoadingEnabled = false;
//var Job = context.Job.Where(r => r.Jobid == jobId).SingleOrDefault();
//context.LoadProperty(Job, "Surveys");
//context.LoadProperty(Job, "SiteInfoes");
//var Job = (from j in context.Job
// .Include("Surveys")
// .Include("SiteInfoes")
// select j).SingleOrDefault();
//var Job = context.Job.Where(r => r.Jobid == jobId).SingleOrDefault();
//var surveys = context.Surveys.Where(s => s.JobID == jobId);
//var wellInfoes = context.SiteInfoes.Where(w => w.Jobid == jobId);
//Job.Surveys = surveys.ToList();
//Job.SiteInfoes = wellInfoes.ToList();
//return Job;
}
下面是我使用的POCO对象:
public class Job
{
public int? Jobid { get; set; }
public string JobLocation { get; set; }
public string JobName { get; set; }
public virtual IEnumerable<Survey> Surveys { get; set; }
public virtual IEnumerable<SiteInfo> SiteInfoes { get; set; }
}
public class Survey
{
public int SurveyID { get; set; }
public int? JobID { get; set; }
public DateTime? DateTime { get; set; }
public string Report { get; set; }
public virtual Job Job { get; set; }
}
public class SiteInfo
{
public int Jobid { get; set; }
public string SiteLocation { get; set; }
public virtual JobInfo JobInfo { get; set; }
}
如何正确加载相关实体?
听起来好像这就是例外告诉我。感谢您的澄清。 – Rich
你能解释为什么IEnumerable不支持? - 我很想知道。 –
series0ne