將SQL轉換為LINQ查詢-組/聯接/過濾器

Question

我有以下查詢：

SELECT S.[FlowOrder], S.[DESCRIPTION], COUNT(I.ID)
FROM WorkFlowStatus AS S
INNER JOIN Item AS I
    ON S.ID = I.StatusID
WHERE I.Installation = '1'
GROUP BY S.[Description], S.[FlowOrder]
ORDER BY S.[FlowOrder]

這給了我一個項目的數量，按工作流程的外鍵分組，從我的FK表中輸出描述性名稱。

我已經在后台使用LINQ查詢（使用LINQ-to-SQL）進行了深入探討：

var items = from s in _entities.WorkflowStatus
    join i in _entities.Items on s.ID equals i.StatusId
    into Statuses
    orderby s.FlowOrder
    select new {s.Description, ItemCount = Statuses.Count() };

如何將SQL中的where子句添加到此LINQ查詢中？

Answer 1

這個怎么樣？

var items = from s in _entities.WorkflowStatus
    join i in _entities.Items.Where(item=>item. Installation == "1") on s.ID equals i.StatusId
    into Statuses
    orderby s.FlowOrder
    select new {s.Description, ItemCount = Statuses.Count() };