請大家審閱以下程式碼：

 1  [Route("/crmorders/gettomonthtotal")]
 2 public string GetOrdersToMonthTotal(string monStr, string sdept,int page=1,int limit= 20)
 3 {
 4 using (var db = new hibiContext())
 5 {
 6 var dateMonthFD = monStr.ToDateTime().GetMonthFirstDay();
 7 var dateMonthLD = monStr.ToDateTime().GetMonthLastDay();
 
 8 //獲取資料集的總條數
 9 var count = db.BivCrmProdordersOri.Count();
10 ​
11 //linq表示式的正確寫法
12 var dataLinq01 = (from o in db.BivCrmProdordersOri
13 where o.DictDtlNameBus == sdept && o.AcceptDate >= dateMonthFD && o.AcceptDate <= dateMonthLD
14 orderby o.AcceptDate
15 select o).Skip((page - 1
 
) * limit).Take(limit).ToList();
16 //linq表示式的錯誤寫法
17 var dataLinq02 = (from o in db.BivCrmProdordersOri
18 where o.DictDtlNameBus == sdept && o.AcceptDate.Value.ToString("yyyy-MM") == monStr
19 orderby o.AcceptDate
20 select o).Skip((page - 1) * limit).Take(limit).ToList();
21 
22 //lambda表示式的正確寫法
 

23 var dataLambda01 = db.BivCrmProdordersOri
24 .Where(o => o.DictDtlNameBus == sdept && o.AcceptDate >= dateMonthFD && o.AcceptDate <= dateMonthLD)
25 .OrderByDescending(o => o.AcceptDate)
26 .Skip((page - 1) * limit)
27 .Take(limit)
28 .Select(o=>o)
29 .ToList();
30 
31 //lambda表示式的錯誤寫法
32 var dataLambda02 = db.BivCrmProdordersOri
33 .Where(o => o.DictDtlNameBus == sdept && o.AcceptDate.Value.ToString("yyyy-MM") == monStr)
34 .OrderByDescending(o => o.AcceptDate)
35 .Skip((page - 1) * limit)
36 .Take(limit)
37 .Select(o => o)
38 .ToList();
39 ​
40 var ret = new { code = 0, msg = "", count = count, data = data3};
41 var json = Newtonsoft.Json.JsonConvert.SerializeObject(ret);
42 return json;
43 }
44 }

更應該建議使用下列值型別比較的方法來達到目的。