摘要：1.计数var q = from p in db.Products group p by p.CategoryID into g select new { g.Key, NumProducts = g.Count() }; 语句描画：Linq运用Group By和Count失掉每个Cat... 阅读全文

摘要：1、左连接：var LeftJoin = from emp in ListOfEmployeesjoin dept in ListOfDepartmenton emp.DeptID equals dept.ID into JoinedEmpDeptfrom dept in JoinedEmpDept... 阅读全文

摘要：class ClientStruct { public string ID = "ID"; public string Name = "Name"; public string Company = "Co... 阅读全文

摘要：var re = from t in datatablegroup t by new {t.a,t.b,t.c,t.d} into gselect new {g.key,e=g.Sum(k => k.a)}; 阅读全文