我有两个型号
public class Indicator
{
public long IndicatorID { get; set; }
public string Name { get; set; }
public int MaxPoint { get; set; }
public string Comment { get; set; }
public DateTime DateChanged { get; set; }
public DateTime DateCreated { get; set; }
public virtual IList<CalculationType> CalculationTypes { get; set; }
}
public class CalculationType
{
public long CalculationTypeID { get; set; }
public string UnitName { get; set; }
public int Point { get; set; }
public DateTime DateCreated { get; set; }
public DateTime DateChanged { get; set; }
public virtual Indicator Indicator { get; set; }
}
我有数据库工厂
public class DatabaseFactory
{
private StankinQuestionnaireEntities dataContext;
public StankinQuestionnaireEntities Get()
{
return dataContext ?? (dataContext = new StankinQuestionnaireEntities());
}
}
和引用databaseFactory的属性
protected StankinQuestionnaireEntities DataContext
{
get { return dataContext ?? (dataContext = DatabaseFactory.Get()); }
}
我使用Autofac和regiser DatabaseFactory
builder.RegisterType<DatabaseFactory>().As<IDatabaseFactory>().InstancePerRequest();
在我的存储库中,我尝试以两种方式从导航属性中获取数据
<< img src =“ https://image.soinside.com/eyJ1cmwiOiAiaHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS83cjluOC5wbmcifQ==” alt =“在此处输入图像描述”>“ >>
第一行工作正常(CalculationType包含一个元素)
<< img src =“ https://image.soinside.com/eyJ1cmwiOiAiaHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9Dc09MRC5wbmcifQ==” alt =“在此处输入图像描述”>
但是第二行在属性CalculationType上返回null
<< img src =“ https://image.soinside.com/eyJ1cmwiOiAiaHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9pbXpTZS5wbmcifQ==” alt =“在此处输入图像描述”>
为什么?
UPDATE
我发现,如果删除行“ .InstancePerRequest()”,则一切正常。但是我不适合这个。UPDATE2
由于某种原因,如果未创建代理类,则为该类我有两个模型public class Indicator {public long indicatorID {get;组; } public string Name {get;组; } public int MaxPoint {get;组; } public string评论{get;组; } ...
您的数据库上下文肯定具有不同的ProxyCreationEnabled属性值。
尝试一下:
我也遇到过同样的问题,首先加载页面时,它工作正常,当我刷新页面时,我得到空引用异常。就我而言,我正在使用Task