C# 更新作为参数传递给方法的实体对象的值

我有一个传递给方法的查询对象

using (var ctx = new AH_ODS_DBEntities1())
{
    var orlist =  ctx.Collections.Where(x => x.AQ_PostStatus == 0).GroupBy(x => x.SourceOR).Select(x => new { Key = x.Key }).ToList();
    foreach(var ordocnumber in orlist) // navigate the list of OR's
    {
        Console.WriteLine(ordocnumber.Key);//+"\n"+fatnotes+"\n");                    
        var orcontents = ctx.Collections.Where(dx => dx.SourceOR == ordocnumber.Key).ToList().Select(dx =>
            new Collection
            {   
                AmountPaid = dx.AmountPaid,
                ApplicationDate = dx.ApplicationDate,
                AQ_Branch = dx.AQ_Branch,
                AQ_PostStatus = dx.AQ_PostStatus,
                AQ_StatusDate = dx.AQ_StatusDate,
                CashAccount = dx.CashAccount,
                CustomerCode = dx.CustomerCode,
                Description = dx.Description,
                DocumentType = dx.DocumentType,
                DTS = dx.DTS,
                ExtSerial = dx.ExtSerial,
                PaymentMethod = dx.PaymentMethod,
                Serial = dx.Serial,
                SourceBranch = dx.SourceBranch,
                SourceInvoice = dx.SourceInvoice,
                SourceOR = dx.SourceOR,
                TotalAmountPaid = dx.TotalAmountPaid,
                Type = dx.Type

            });

        AQEngine2(context, orcontents);   // i will do some stuff here   
        ctx.SaveChanges();
    }
}

O将Or内容传递给方法AQEngine2（上下文，Or内容）。在方法内部，我浏览对象并更新其属性：

public static void AQEngine2(KDICOLLECTIONS.Screen context,  IEnumerable<Collection> orcontents){

    Boolean HasError = false;
    foreach (var subitem2 in orcontents) // naviagte through the selected OR and fill-up the stuff for AQ
    {

        if (HasError)
        {
            subitem2.AQ_PostStatus = -1;
        }
    }
}

publicstaticvoidaqengine2（KDICOLLECTIONS.Screen上下文、IEnumerable或contents）{
布尔hasrerror=false；
foreach（orcontents中的var子项2）//导航选定的OR并填充AQ的内容
{
if（hasrerror）
{
子项2.AQ_PostStatus=-1；
}
}
}

我希望更新能够反映回呼叫过程。我试着添加ref-IEnumerable或content，但它不起作用

返回值的正确方法是什么

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谢谢，

如果理解问题背后的问题，那么这个问题已经有答案了：谢谢@OgnyanDimitrov