【LINQ】指定的 LINQ 表达式包含对与不同上下文关联的查询的引用

通过把两个实体放到同一个上下文

关键字 ObjContext(不能跨库使用)

使用前

 OrderParentService orderParentService = new OrderParentService();
 OrderItemService orderItemService = new OrderItemService();

 var platform = Platform.EBay.ToString();
 var datetime= DateTime.Now.AddMonths(-1);
 //订单主表
 var orderParentList = orderParentService.FindAll(p => p.PLATFORM == platform && p.ORDER_INSERT_DATE >= datetime).Select(p => p.ORDER_ID);
 //订单详情
 var orderItemList = orderItemService.FindAll(p => orderParentList.Contains(p.ORDER_ID) && p.ASIN == null);

使用后

OrderParentService orderParentService = new OrderParentService();
var op = orderParentService.ObjContext;
OrderItemService orderItemService = new OrderItemService();
orderItemService.ObjContext = op;

var platform = Platform.Amazon.ToString();
var datetime= DateTime.Now.AddMonths(-1);
//订单列表
var orderParentList = orderParentService.FindAll(p => p.PLATFORM == platform && p.ORDER_INSERT_DATE >= datetime).Select(p => p.ORDER_ID);
//订单详情
var orderItemList = orderItemService.FindAll(p => orderParentList.Contains(p.ORDER_ID) && p.ASIN == null);

完美解决【撒花~】