如何从LINQ获取实体的唯一值？

Question

我有 using (ProjectEntities myEntities = new ProjectEntities ()) { var q = (from c in myEntities.Customers orderby c.Name select c.Name); DropDownList1.DataSource = q.ToList(); DropDownList1.DataBind(); } 从此查询中获取数据：

ng-model

如何获得唯一的名称？

Answer 1

只需添加 Distinct

即可

 var q = (from c in myEntities.Customers orderby c.Name select c.Name);
 DropDownList1.DataSource = q.ToList().Distinct();

或查询本身，

 var q = (from c in myEntities.Customers orderby c.Name select c.Name).Distinct();

Answer 2

您可以对从当前linq表达式获得的结果调用Distinct()方法。

var q = (from c in myEntities.Customers orderby c.Name select c.Name).Distinct();

或

var q = myEntities.Customers.OrderBy(s=>s.Name).Select(f=>f.Name).Distinct();