C# 在列表中返回列表时出现Linq错误

我有一个定义如下的类：

public class SearchResult
{
    public Customer Customer { get; set; }
    public Receipt Receipt { get; set; }
    public IEnumerable<ReceiptDetail> ReceiptDetail { get; set; }
}

我得到“找不到源类型ReceiptDetail‘Select’notfound的查询模式的实现”

---

我做错了什么？

嗯，

recdet

来自这里：

join recdet in dbContext.ReceiptDetails on rec.IdReceipt equals recdet.IdReceipt

这意味着它是一个单一的收据细节。然后，您尝试在此处将其用作集合：

我怀疑你真的想要加入一个团体：

join recdet in dbContext.ReceiptDetails on rec.IdReceipt equals recdet.IdReceipt
  into recdets
...
ReceiptDetail = (from  r1 in recdets select r1).ToList()

或者更简单地说，对于后一部分：

ReceiptDetail = recdets.ToList()

join recdet in dbContext.ReceiptDetails on rec.IdReceipt equals recdet.IdReceipt
  into recdets
...
ReceiptDetail = (from  r1 in recdets select r1).ToList()

ReceiptDetail = recdets.ToList()