將sql更改爲linq

Question

嗨誰能建議如何將下面的SQL腳本更改爲linq？

SELECT *, CASE WHEN datepart(day, DateIssue)<27 THEN datepart(month,DateIssue) ELSE datepart(month,DateIssue) % 12 + 1 END as group_name FROM Payments;

感謝

Answer 1

假設你有一個名爲Payments付款清單：

var query = from p in Payments 
      let dateIssue = (DateTime)p["DateIssue"] 
      let gName = (dateIssue.Day < 27) ? (dateIssue.Month) : (dateIssue.Month % 12 + 1) 
      select new { payment = p, groupName = gName }; 

的Payments列表可以是任何東西，從可迭代

如果需要的話，你可以遍歷派生這樣：

foreach (var value in query) { 
    // value.payment the original item of Payments 
    // and value.groupName contains the other column 
} 

上帝保佑！