c# – 将SQL转换为Linq查询
发布时间:2020-12-15 20:47:38 所属栏目:百科 来源:网络整理
导读:我对 Linq查询很新,我只想将我的数据库查询转换为Linq. 这是我简单的SQL查询: var query = "SELECT EnrollmentDate,COUNT(*) AS StudentCount " + "FROM Person " + "WHERE EnrollmentDate IS NOT NULL " + "GROUP BY EnrollmentDate";var data = db.Databa
我对
Linq查询很新,我只想将我的数据库查询转换为Linq.
这是我简单的SQL查询: var query = "SELECT EnrollmentDate,COUNT(*) AS StudentCount " + "FROM Person " + "WHERE EnrollmentDate IS NOT NULL " + "GROUP BY EnrollmentDate"; var data = db.Database.SqlQuery<EnrollmentDateGroup>(query); 它运行正常,但是怎么可能在Linq中编写这个查询,我只是无法将group by语句转换为Linq.转换成Linq似乎有些棘手. 谁能帮我这个? 解决方法var result = db.Person .Where(r=> r.EnrollmentDate != null) .GroupBy(r=> r.EnrollmentDate) .Select( group=> new { EnrollmentDate = group.Key,Count = group.Count() }); (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |