具有多个OR条件的Linq到实体联接表

Question

我需要编写一个Linq实体状态，该状态可以获得以下SQL查询。

SELECT  RR.OrderId
FROM    dbo.TableOne RR
        JOIN dbo.TableTwo  M ON RR.OrderedProductId = M.ProductID OR RR.SoldProductId= M.ProductID
WHERE   RR.StatusID IN ( 1, 4, 5, 6, 7 )

我被以下语法困住了

 int[] statusIds = new int[] { 1, 4, 5, 6, 7 };
            using (Entities context = new Entities())
            {
                var query = (from RR in context.TableOne
                             join M in context.TableTwo on new { RR.OrderedProductId, RR.SoldProductId} equals new { M.ProductID }
                             where RR.CustomerID == CustomerID 
                             && statusIds.Any(x => x.Equals(RR.StatusID.Value))
                             select RR.OrderId).ToArray();
            }

这给了我以下的错误

错误50联接子句中的一个表达式的类型不正确。类型推断在调用'Join'.时失败

如何对表执行多个条件联接。

Answer 1

您不必使用联接语法。在where子句中添加谓词具有相同的效果，您可以添加更多条件：

var query = (from RR in context.TableOne
             from M in context.TableTwo 
             where RR.OrderedProductId == M.ProductID
                   || RR.SoldProductId == M.ProductID // Your join
             where RR.CustomerID == CustomerID 
                   && statusIds.Any(x => x.Equals(RR.StatusID.Value))
             select RR.OrderId).ToArray();

Answer 2

将查询语法从使用join更改为使用附加的from子句

  var query = (from RR in context.TableOne
               from M in context.TableTwo.Where(x => x.ProductID == RR.OrderedProductId || x.ProductID == RR.SoldProductId)
               where statusIds.Any(x => x.Equals(RR.StatusID.Value))
               select RR.OrderId).ToArray();

Answer 3

多重连接：

var query = (from RR in context.TableOne
             join M in context.TableTwo on new { oId = RR.OrderedProductId,  sId = RR.SoldProductId} equals new { oId = M.ProductID, sId = M.ProductID }
             where RR.CustomerID == CustomerID 
             && statusIds.Any(x => x.Equals(RR.StatusID.Value))
             select RR.OrderId).ToArray();