///<summary>///linq///</summary>publicclassLinq{///<summary>///测试///</summary>publicstaticvoidTest(){Aggregate1();Aggregate2();Aggregate...

varquery=fromainthis.ObjectContext.siteInfojoinbinthis.ObjectContext.shopInfoona.siteIDequalsb.siteIDgroupnew{a,b}bynew{a.Lon,a.Lat,a.siteID,b.date}intogselectn...

1、左连接：varLeftJoin=fromempinListOfEmployeesjoindeptinListOfDepartmentonemp.DeptIDequalsdept.IDintoJoinedEmpDeptfromdeptinJoinedEmpDept.DefaultIfEmpty()selectnew{...

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本篇介绍Linq的Group和Join操作，继续使用《Linq学习(3)语法结构》中介绍的数据源。GroupGroup是进行分组操作，同SQL中的GroupBy类似。原型如下：public static IEnumerable<IGrouping<TKey,TSource>>...

Linq使用GroupBy11.简单形式：varq=frompindb.Productsgrouppbyp.CategoryIDintogselectg;语句描述：Linq使用GroupBy按CategoryID划分产品。说明：frompindb.Products表示从表中将产品对象取出来。grouppbyp.Cate...

Linq中按照多个值进行分组(GroupBy).GroupBy(x=>new{x.Age,x.Sex})groupempbynew{emp.Age,emp.Sex}intog//实现多key分组的扩展函数版本varsums=empList.GroupBy(x=>new{x.Age,x.Sex}).Selec...

varids=(fromidined_ProjectClass.ValuesselectGuid.Parse(id)).ToArray();Entity.ProjectClassCollection.Where(p=>ids.Contains(p.Id)==false).ToList().ForEach(p=&g...

Linq动态查询与模糊查询（带源码示例）继LINQ动态组合查询PredicateExtensions讲解 -----在用上面的方法时遇到了些问题 解决LINQtoEntities不支持LINQ表达式节点类型“Invoke”LINQtoEntities不支持LINQ表达式节点类...

1.VIEW页面显示代码<linkhref="~/Content/bootstrap.css"rel="stylesheet"/><divclass="well"><tableclass="table"><tr><th>用户名</th><th...

DBML：[Function(Name="dbo.p_GetStudyStageSubjectGroup")]publicISingleResult<STUDYSTAGE_SUBJECTGROUP__QRM>p_GetStudyStageSubjectGroup([Parameter(Name="TimeP...

LINQ系列  学习篇1学习篇2...

Asaresponseforcustomer'squestion,IdecidedtowriteaboutusingLikeOperatorinLinqtoSQLqueries.StartingfromasimplequeryfromNorthwindDatabase;varquery=fromcinctx.Custo...

 SupposeyouhaveatblRoomandtblUserInfo.Now,youneedtoselectalltheroomsregardlessofwhethertheroomhasuserinformationornot.ThiscallsforaLEFTJOINwhichwillselecte...

linqtosql实现左（右）连接，那个方法是对的varquery2=fromtb0indb.table_0 jointb1indb.table_1ontable_0.关联键equalstable_1.关联键 intoall fromtb2inall.DefaultIfEmpty()&nb...