Question

我有以下查询

 var maListe = (from p in db.full
                       where ((p.acknowledge_by.Equals(..) && date>(new DateTime(2015,03,03)))

                       select new RequeteOptimise
                       {
                           objet = p.mc_object
                       }).ToList();

内部（...）我需要放一些不会影响查询的东西，结果应该就像我们运行这个查询一样

 var maListe = (from p in db.full
                       where ( date>(new DateTime(2015,03,03))

                       select new RequeteOptimise
                       {
                           objet = p.mc_object
                       }).ToList();

Answer 1

我会把它分开：

var queryBase = db.full.Where(p => date > (new DateTime(2015,03,03))).AsQueryAble();

然后如果你必须（例如在if块中）

queryBase = queryBase.Where(p => p.acknowledge_by.Equals( yourcriteria ));

然后实现：

var maListe = queryBase.Select(p => new RequeteOptimise{ objet = p.mc_object }).ToList();

一个Swing的替代方案：

var maListe = (from p in db.full
               where ( string.IsNullOrEmpty(yourcritera) || p.acknowledge_by.Equals(yourcriteria)) && date > new DateTime(2015,03,03)
               select new RequeteOptimise
               {
                   objet = p.mc_object
               }).ToList();

实体框架，其中列不相等

1 个答案: