如何使用内连接和子查询将 SQL 查询转换为 LINQ lambda 表达式

Question

I want to convert following SQL query into LINQ lambda expression.

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

I have not tested this, but it should be something like:

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);