在Linq中对Sql进行求和和减法

Question

大家好我想要实现像Linq到Sql的SQL Select语句。任何帮助将不胜感激。

SELECT SUM(Debit-Credit) AS LBalance FROM dbo.LeaveLedger
WHERE StaffId =1 AND LYEAR='2000'

Answer 1

假设实体框架：

Context.Table.Where(x => x.StaffId == 1 and x.LYEAR == "2000")
   .Sum(y => (y.Debit - y.Credit));

Answer 2

这样的东西？

var sum = 
    db.LeaveLedger
      .Where(ll => ll.StaffId == 1 and ll.LYEAR == "2000")
      .Sum(ll => (ll.Debit - ll.Credit))

Answer 3

由于Mansfield已经显示了表达式语法，我将使用经典查询：

var LBalance = (from p in dbo.LeaveLedger
                where p.StaffId == 1 && p.LYEAR == "2000"
                select (p.Debit - p.Credit).Sum();