一.投影操作符 1. Select Select操作符对单个序列或集合中的值进行投影.下面的示例中使用select从序列中返回Employee表的所有列: //查询语法 var query = from e in db.Employees where e.FirstName.StartsWith("M") select e; 生成的sql:SELECT [Extent1].[EmployeeID] AS [EmployeeID], [Extent1].[LastName…
//SelectMany List<List<int>> Numbers = new List<List<int>>() { new List<int>{1,2,3}, new List<int>{4,5,6}, new List<int>{7,8,9} }; var result = Numbers.SelectMany(a => a); foreach (var nubers in result) { Conso…
沿用之前某一篇文章的实体类与EF操作类代码.数据库中增加几条数据 Linq 的排序方式,下面例子是根据RoleId 升序,Name降序 EFContext<Member> efMemberContext = new EFContext<Member>(); var memberSet = efMemberContext.Set<Member>().Include("Role"); var memberList = from m in memberSe…