如何使用內連接和子查詢將 SQL 查詢轉換為 LINQ lambda 表達式

Question

我想將以下 SQL 查詢轉換為 LINQ lambda 表達式。

SELECT Hod.* 
FROM (SELECT * FROM tbLease_Approval
      WHERE (UserRole='HOD' and IsApproved=1)) Pm 
INNER JOIN (SELECT * FROM tbLease_Approval
            WHERE UserRole='Finance' and IsApproved=0) Hod 
ON Pm.LeaseNo=Hod.LeaseNo

Answer 1

我沒有測試過這個，但它應該是這樣的：

var qry= tbLease_Approval
             .Join(tbLease_Approval, hod => hod.LeaseNo, fin => fin.LeaseNo, (hod, fin) => new { Hod = hod, Finance = fin })
             .Where(joined => joined.Hod.UserRole.Equals("Hod")
                           && joined.Hod.IsApproved == 1
                           && joined.Finance.UserRole.Equals("Finance")
                           && joined.Finance.IsApproved == 0);