C# 使用EF4.0创建审核记录

我试图创建一个审计记录，用于历史目的。我从下面的文章中找到了这段代码

List<sysaudit> auditTrailList = new List<sysaudit>();
            IEnumerable<ObjectStateEntry> changes =  ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Deleted | EntityState.Modified);
            foreach (ObjectStateEntry stateEntryEntity in changes)
            {
                if (!stateEntryEntity.IsRelationship &&
                        stateEntryEntity.Entity != null &&
                            !(stateEntryEntity.Entity is sysaudit))
                {//is a normal entry, not a relationship
                    sysaudit audit = pamsContext.AuditTrailFactory(stateEntryEntity, "");
                    auditTrailList.Add(audit);
                }
            }
            if (auditTrailList.Count > 0)
            {
                foreach (var audit in auditTrailList)
                {//add all audits
                    this.AddToDBAudit(audit);
                }
            }

这就是它抱怨的那条线

IEnumerable<ObjectStateEntry> changes = ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Deleted | EntityState.Modified);

IEnumerable changes=ObjectStateManager.GetObjectStateEntries（EntityState.Added | EntityState.Deleted | EntityState.Modified）；

该行上的EntityState应参考System.Data.EntityState枚举。您能否将鼠标悬停在提及的EntityState上以验证这一点

考虑到您提到的编译错误，我怀疑您的类还包含名为EntityState的非静态字段或属性

如果是这样，您将需要更改相关行以完全限定名称空间，即：

IEnumerable<ObjectStateEntry> changes = ObjectStateManager.GetObjectStateEntries(System.Data.EntityState.Added | System.Data.EntityState.Deleted | System.Data.EntityState.Modified);

IEnumerable changes=ObjectStateManager.GetObjectStateEntries（System.Data.EntityState.Added | System.Data.EntityState.Deleted | System.Data.EntityState.Modified）；

pamsContext对象是否已初始化？

IEnumerable<ObjectStateEntry> changes = ObjectStateManager.GetObjectStateEntries(System.Data.EntityState.Added | System.Data.EntityState.Deleted | System.Data.EntityState.Modified);