请问下大家有没遇到EF调用GetValidationErrors时出错

Question

请问下大家有没遇到EF调用GetValidationErrors时出错，我知道报错是说未将对象设置为引用对象，但我不明白为什么调用GetValidationErrors时里面报错。错误代码如下：
error message:Object reference not set to an instance of an object., the UniqueReference value is :1334241M01. We will move this file.]
System.NullReferenceException: Object reference not set to an instance of an object.
at System.Data.Entity.Core.Objects.EntityEntry.DetectChangesInProperty(Int32 ordinal, Boolean detectOnlyComplexProperties, Boolean detectOnly)
at System.Data.Entity.Core.Objects.EntityEntry.DetectChangesInProperties(Boolean detectOnlyComplexProperties)
at System.Data.Entity.Core.Objects.ObjectStateManager.DetectChangesInScalarAndComplexProperties(IList1 entries)
at System.Data.Entity.Core.Objects.ObjectStateManager.DetectChanges()
at System.Data.Entity.Core.Objects.ObjectContext.DetectChanges()
at System.Data.Entity.Internal.InternalContext.DetectChanges(Boolean force)
at System.Data.Entity.Internal.InternalContext.GetStateEntries(Func2 predicate)
at System.Data.Entity.Internal.InternalContext.GetStateEntries()
at System.Data.Entity.Infrastructure.DbChangeTracker.Entries()
at System.Data.Entity.DbContext.GetValidationErrors()
at Ligentia.DataTool.ClientLibraries.OfficeWorks.JobImportShipmentData.getDbError(Ligentix4Entities L4Entities)。
其中getDbError是我自己写的方法。其余都是调用微软的EFContext.GetValidationErrors()时报错了。但在调用GetValidationErrors()方法前，我有判断调用的对象不是为空了，如：
if (l4Entities != null)
{
IEnumerable validationResults =l4Context.GetValidationErrors();
}
请教大家帮帮忙看下为什么啊？谢谢大家

Answer 1

System.NullReferenceException: Object reference not set to an instance of an object.

空引用了，debug看一下具体出错在哪一行