需要 linq 帮助：尝试向 master 添加详细信息

Question

我没有做太多处理标题和详细记录的工作。我需要创建一个订单对象 并将 IList 我要做的就是在标头有效负载中填充我的“IList”。我不断收到“查询正文必须以选择结尾”并且不知道如何完成。我确定有更好的方法 使用连接，但如果我能让它工作，我会很激动。

var orderHeaderRecords = ctx.sparGetOrderConfirmationRecords_WED(runDate).ToList();
var orderDetailRecords = ctx.sparGetOrderConfirmationRecordsDetail_WED(runDate).ToList();

var order = (from o in orderHeaderRecords
//gave up on join
//join od in orderDetailRecords on new { o.RecordType, o.OrderNumber } equals new { od.RecordType, //od.OrderNumber }
  
 select new OrderConfirmation()
 {
    BillAddr1 = o.BillToAddr1,
    BillAddr2 = o.BillToAddr2,
    IsOfficeOrder = Convert.ToBoolean(o.IsOfficeOrder),
    OrderConfirmationType = EnumHelper.GetValueFromDescription<ConfirmationType>(o.RecordType),
    LineItems = new List<LineItem>()
 }).ToList();
 
order.ForEach(or =>
                    
                    {   or.LineItems.AddRange((from line in orderDetailRecords.Where(x => 
                        x.RecordType == or.OrderConfirmationType.ToDescription() 
                        && x.OrderNumber == or.OrderNumber).Select(od =>

                        new LineItem(
                          {
                             Desc = od.Description,
                             ExtAmt = od.ExtPrice.Value,
                            ItemId = od.Item                                                  } 
                          ).Select(rec => rec).ToList()); //.ToList()));

                    });
```
The last line of code (body must end with a select or group by)  
I just need to get the detail records in the "List" on the master record.  

Answer 1

order.ForEach(or =>                    
{   or.LineItems.AddRange(
    orderDetailRecords
    .Where(x => x.RecordType == or.OrderConfirmationType.ToDescription() && x.OrderNumber == or.OrderNumber)
    .Select(od =>
        new LineItem(
            {
                Desc = od.Description,
                ExtAmt = od.ExtPrice.Value,
                ItemId = od.Item                                                  } 
            )).ToList());
});