Entity framework 实体框架在helper方法之后跟踪错误的模型对象

下面是一些基本代码，它是我们的

Create

controller方法的一部分。如果选中某个复选框，我们希望创建当前正在创建的

agenttransmission

对象的副本，并更改几个字段

当程序进入helper方法时，它会创建

sub

记录而不发生意外，但是由于某种原因，当程序完成并返回到

Create

方法时，模型对象

agenttransmission

成为

sub

模型对象。所有值，包括

PK

都突然出现在

agenttransmission

对象中

不确定这是如何发生的，因为helper方法上有一个

字符串

返回值，并且

agenttransmission

记录上没有涉及任何字段

创建方法

//Create substat if requested
if (agenttransmission.OverrideId)
{
    status += ". " + CreateSubStat(agenttransmission);
}

    public string CreateSubStat(AgentTransmission master)
    {
        string msg = string.Empty;
        if (ModelState.IsValid)
        {
            using (AgentResourcesEntities tempDb = new AgentResourcesEntities())
            {
                try
                {
                    //Check to see if substat already exists
                    var check = (from a in db.AgentTransmission
                                 where a.ParentId == master.ID && a.RecordStatus.Equals("P")
                                 select a).ToList();

                    if (check.Count > 0) return string.Empty;

                    //If not add dependent record
                    AgentTransmission sub = master;
                    sub.OverrideId = false;
                    sub.DRMCompanyId = string.Empty;
                    sub.CONCode = "00";
                    sub.RecordStatus = "P";
                    sub.ParentId = master.ID;
                    sub.ID = 0;
                    sub.IsSubstat = true;
                    sub.SendToDynamicsOptions = "N";
                    sub.SendToNMF = false;

                    //Remove blanks from ClearinghousePartners list
                    sub.ClearinghousePartners.RemoveAll(
                        x =>
                        string.IsNullOrWhiteSpace(x.ClearingHouseName) &&
                        string.IsNullOrWhiteSpace(x.TradingPartnerName) && x.StartDate == null);

                    sub.AgentRelationshipCodes.RemoveAll(
                        x =>
                        string.IsNullOrWhiteSpace(x.RelationshipId) &&
                        !x.EffectiveDate.HasValue && x.Id == 0);

                    foreach (var item in sub.AgentRelationshipCodes)
                    {
                        item.LastChangeDate = DateTime.Now;
                        item.LastChangeId = SecurityRules.GetUserName(User);
                        item.AgentTransmission = sub;
                        item.AgtTableId = sub.ID;
                    }

                    foreach (var item in sub.ClearinghousePartners)
                    {
                        item.AgentTransmission = sub;
                        item.AgtTransId = sub.ID;
                    }

                    db.AgentTransmission.Add(sub);
                    db.SaveChanges();

                    msg = "Substat saved with status of 'Dependent'.";
                }
                catch (DbEntityValidationException dbEx)
                {
                    msg = "Error creating substat. IT has been informed and will respond shortly.";
                    SendEmail.ErrorMail(dbEx.Message, SecurityRules.GetUserName(User));
                }
                catch (Exception ex)
                {
                    msg = "Error creating substat. IT has been informed and will respond shortly.";
                    SendEmail.ErrorMail(ex, SecurityRules.GetUserName(User));
                }
            }                
        }
        else
        {
            //Invalid ModelState error handling
            string messages = string.Join("; ", ModelState.Values
                                                          .SelectMany(x => x.Errors)
                                                          .Select(x => x.ErrorMessage));
            SendEmail.ErrorMail("Error Creating Substat: " + messages, SecurityRules.GetUserName(User));
            msg = "Error creating substat. IT has been informed and will respond shortly.";
        }

        return msg;
    }

助手方法

//Create substat if requested
if (agenttransmission.OverrideId)
{
    status += ". " + CreateSubStat(agenttransmission);
}

    public string CreateSubStat(AgentTransmission master)
    {
        string msg = string.Empty;
        if (ModelState.IsValid)
        {
            using (AgentResourcesEntities tempDb = new AgentResourcesEntities())
            {
                try
                {
                    //Check to see if substat already exists
                    var check = (from a in db.AgentTransmission
                                 where a.ParentId == master.ID && a.RecordStatus.Equals("P")
                                 select a).ToList();

                    if (check.Count > 0) return string.Empty;

                    //If not add dependent record
                    AgentTransmission sub = master;
                    sub.OverrideId = false;
                    sub.DRMCompanyId = string.Empty;
                    sub.CONCode = "00";
                    sub.RecordStatus = "P";
                    sub.ParentId = master.ID;
                    sub.ID = 0;
                    sub.IsSubstat = true;
                    sub.SendToDynamicsOptions = "N";
                    sub.SendToNMF = false;

                    //Remove blanks from ClearinghousePartners list
                    sub.ClearinghousePartners.RemoveAll(
                        x =>
                        string.IsNullOrWhiteSpace(x.ClearingHouseName) &&
                        string.IsNullOrWhiteSpace(x.TradingPartnerName) && x.StartDate == null);

                    sub.AgentRelationshipCodes.RemoveAll(
                        x =>
                        string.IsNullOrWhiteSpace(x.RelationshipId) &&
                        !x.EffectiveDate.HasValue && x.Id == 0);

                    foreach (var item in sub.AgentRelationshipCodes)
                    {
                        item.LastChangeDate = DateTime.Now;
                        item.LastChangeId = SecurityRules.GetUserName(User);
                        item.AgentTransmission = sub;
                        item.AgtTableId = sub.ID;
                    }

                    foreach (var item in sub.ClearinghousePartners)
                    {
                        item.AgentTransmission = sub;
                        item.AgtTransId = sub.ID;
                    }

                    db.AgentTransmission.Add(sub);
                    db.SaveChanges();

                    msg = "Substat saved with status of 'Dependent'.";
                }
                catch (DbEntityValidationException dbEx)
                {
                    msg = "Error creating substat. IT has been informed and will respond shortly.";
                    SendEmail.ErrorMail(dbEx.Message, SecurityRules.GetUserName(User));
                }
                catch (Exception ex)
                {
                    msg = "Error creating substat. IT has been informed and will respond shortly.";
                    SendEmail.ErrorMail(ex, SecurityRules.GetUserName(User));
                }
            }                
        }
        else
        {
            //Invalid ModelState error handling
            string messages = string.Join("; ", ModelState.Values
                                                          .SelectMany(x => x.Errors)
                                                          .Select(x => x.ErrorMessage));
            SendEmail.ErrorMail("Error Creating Substat: " + messages, SecurityRules.GetUserName(User));
            msg = "Error creating substat. IT has been informed and will respond shortly.";
        }

        return msg;
    }

那条线

AgentTransmission sub = master;

…不会将

master

复制到

sub

，而是将其分配给

sub

，因为

AgentTransmission

是一种引用类型。因此，您对

sub

所做的一切都是对

master

所做的

您必须将

master

克隆到

sub

（创建一个新对象并复制其属性），或者在调用

CreateSubStat

后从数据库重新获取master对象