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linq to sql 联合查询

var q= from n in db.NewsModel join b in db.BigClassModel on n.BigClassID equals b.BigClassID join s in db.SmallClassModel on n.SmallClassID equals s.SmallClassID orderby n.AddTime descending select new { n.NewsID, n.BigClassID,...

var expected = yourlist.Select(x=>new{id=x.id,name=x.name,name1 = yourlist.First(y=>y.id==x.id).name}纯手打 你自己看着调

var ns=(from n in news join c in comment on n.id equals c.nid).Take(5);

sql = "select * from t where 1=1"; //姓名不为空就把姓名加入where条件 if (!string.IsNullOrEmpty(this.txtName.Text.Trim())) { sql = sql + string.Format(" and name like '%{0}%'", this.txtName.Text.Trim()); } //身份证号不为空就把身...

当然可以,不要被楼上的误导了。所有的直接或间接继承自ICollection, IList 接口的集合类均可以作为DataGridView的数据源。 linq to sql 查询出来的,可以不用创建对应的entity. 返回匿名类型也可以。

from A in DFZFORMT055 join B in FM_CODE_LIST on A.MoneyType = B.ITEM_VALUE AND B.FORM_KIND = 'DFZ.FORM.T055' AND B.FIELD_NAME= 'MoneyType' join C in JOIN FM_CODE_LIST on A.PayMentType = C.ITEM_VALUE AND C.FORM_KIND = 'DFZ.FORM....

很简单,可以做类似SQL的拼接方法: dim iQuery= from a in b select a if aa.length >0 then iQuary = iQuary.Where(function(w) w.o1 = aa) if bb.length >0 then iQuary = iQuary.Where(function(w) w.o2 = bb) .........

1.多表复合查询的话建议做成视图就比较方便,要不然通过linq来处理复合查询是比较麻烦的。 2. SQL:select * from A,B where A.cpID=B.cpID and A.cbID=B.cbID LINQ:var p = from t1 in a from t2 in b from t3 in c where t1.cpid equal t2.cpid...

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