C# 按列表中的嵌套对象筛选

有人可以建议如何在LINQ中按嵌套对象进行过滤吗。 我有一个简单的1->多关系对象：

public class WaybillReferences
{
    public int WaybillID { get; set; }
    public string WaybillNo { get; set; }
    public DateTime? WaybillDate { get; set; }
    public string FromBCentre { get; set; }
    public string ToBCentre { get; set; }
    public string FromCustomer { get; set; }
    public string ToCustomer { get; set; }
    public DateTime? PODDate { get; set; }
    public string Signee { get; set; }
    public int? BillingCustomerID { get; set; }
    public List<Order> orderReferences { get; set; }
}

现在，我的目标是为将在WaybillReference.WaybillNo和List.Id中搜索该#值的用户提供一个过滤器 这就是我尝试过的：

 var data = (from w in _context.Waybill
            join fromCust in _context.Customer on w.PickupCustId equals fromCust.Id
            join toCust in _context.Customer on w.DeliverCustId equals toCust.Id
            join fromBC in _context.Bcentre on fromCust.Pcode equals fromBC.Id
            join toBC in _context.Bcentre on toCust.Pcode equals toBC.Id
            select new WaybillReferences
            {
                WaybillID = w.Id,
                WaybillNo = w.CourierWbno,
                WaybillDate = w.Date,
                PODDate = w.Poddate,
                Signee = w.Signee,
                FromCustomer = fromCust.Name,
                ToCustomer = toCust.Name,
                FromBCentre = fromBC.Name,
                ToBCentre = toBC.Name,
                BillingCustomerID = w.BillCust,
                orderReferences = _context.Order.Where(y => y.WaybillId == w.Id).ToList()
            }).Where(x => BillCustomers.Contains(x.BillingCustomerID)
                   && (fromDate == null || x.WaybillDate >= fromDate)
                   && (toDate == null || x.WaybillDate <= toDate)
                   && (FilterBy.Equals("#") || x.WaybillNo.StartsWith(FilterBy))
                   && (FilterBy.Equals("#") || x.orderReferences.Any(x=> x.Id.StartsWith(FilterBy))) /*Error Here*/
           )
         .OrderBy(z => z.WaybillDate)
         .Take(300);

        return await data.ToListAsync();

var数据=（来自w in _context.Waybill
在w上的_context.Customer中加入fromCust。PickupCustId等于fromCust.Id
在w.DeliverCustId等于cust.Id时加入到_context.Customer中
在fromCust.Pcode等于fromBC.Id的_context.bcenter中加入fromBC
在toCust.Pcode等于toBC.Id上的_context.Bcentre中加入toBC
选择新的路标参考
{
WaybillID=w.Id，
WaybillNo=w.CourierWno，
WaybillDate=w.日期，
PODDate=w.PODDate，
签字人=w.签字人，
fromcuster=fromcuster.Name，
ToCustomer=toCust.Name，
FromBCentre=fromBC.Name，
ToBCentre=toBC.Name，
BillingCustomerID=w.BillCust，
orderReferences=\u context.Order.Where（y=>y.WaybillId==w.Id）.ToList（）
}).Where（x=>BillCustomers.Contains（x.BillingCustomerID）
&&（fromDate==null | | x.WaybillDate>=fromDate）
&&（toDate==null | | x.WaybillDate x.Id.StartsWith（FilterBy））/*此处出现错误*/
)
.OrderBy（z=>z.WaybillDate）
.采取（300）；
返回wait data.toListSync（）；

感谢您的时间和帮助

编辑：我得到一个错误

InvalidOperationException:LINQ表达式“DbSet.Join（outer:DbSet，inner:w=>w.PickupCustId，outerKeySelector:c=>（可空）c.Id，innerKeySelector:（w，c）=>new transparentifier（outer=w，inner=c））.Join（outer:DbSet，inner:ti=>ti.outer.DeliverCustId，outerKeySelector:c0=>（可空）c0.Id，innerKeySelector:（ti，c0）=>新的透明标识符，客户>（Outer=ti，Inner=c0））.Join（Outer:DbSet，Inner:ti0=>ti0.Outer.Inner.Pcode，outerKeySelector:b=>b.Id，innerKeySelector:（ti0，b）=>新的透明标识符，客户>，Bcentre>（Outer=ti0，Inner=b））.Join（外部：DbSet，内部：ti1=>ti1.outer.inner.Pcode，outerKeySelector:b0=>b0.Id，innerKeySelector:（ti1，b0）=>新的透明标识符，Customer>，Bcentre>，Bcentre>（外部=ti1，内部=b0））。其中（ti2=>包含（ti2.outer.outer.outer.outer.outer.outer.outer.BillCust.BillCust）&&False|ti2.Outer.Outer.Outer.Outer.Date>=&uu from Date_1&&True&False|uu FilterBy_2==“ti2.Outer.Outer.Outer.Outer.CourierWbno！=null&&uu FilterBy_2！=null&&ti2.Outer.Outer.Outer.Outer.courierbno.StartsWith（u FilterBy| 2）和DbSet.Where（o=>o.billwayid==2.Outer.toll（））（c=>False | | | | | | | c.Id！=null和&&&&| u FilterBy | u 2！=null和&&c.Id.StartsWith（| u FilterBy | u 2）））无法翻译。请以可以翻译的形式重写查询，或者通过插入对AsEnumerable（）、asAsAsAsAsSyncEnumerable（）、ToList（）或ToListSync（）的调用，显式切换到客户端计算。有关详细信息，请参阅

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你的尝试有什么问题？你得到了什么错误？添加了错误。你的尝试有什么问题？你得到了什么错误？添加了错误。

 var data = (from w in _context.Waybill
            join fromCust in _context.Customer on w.PickupCustId equals fromCust.Id
            join toCust in _context.Customer on w.DeliverCustId equals toCust.Id
            join fromBC in _context.Bcentre on fromCust.Pcode equals fromBC.Id
            join toBC in _context.Bcentre on toCust.Pcode equals toBC.Id
            select new WaybillReferences
            {
                WaybillID = w.Id,
                WaybillNo = w.CourierWbno,
                WaybillDate = w.Date,
                PODDate = w.Poddate,
                Signee = w.Signee,
                FromCustomer = fromCust.Name,
                ToCustomer = toCust.Name,
                FromBCentre = fromBC.Name,
                ToBCentre = toBC.Name,
                BillingCustomerID = w.BillCust,
                orderReferences = _context.Order.Where(y => y.WaybillId == w.Id).ToList()
            }).Where(x => BillCustomers.Contains(x.BillingCustomerID)
                   && (fromDate == null || x.WaybillDate >= fromDate)
                   && (toDate == null || x.WaybillDate <= toDate)
                   && (FilterBy.Equals("#") || x.WaybillNo.StartsWith(FilterBy))
                   && (FilterBy.Equals("#") || x.orderReferences.Any(x=> x.Id.StartsWith(FilterBy))) /*Error Here*/
           )
         .OrderBy(z => z.WaybillDate)
         .Take(300);

        return await data.ToListAsync();