c# - 按定制订单订购商品

Question

我有一个插入数据库的列表:

List<House> houses = new List<House> {
  new House { Id = 1, Type = "A" },
  new House { Id = 2, Type = "B" },
  new House { Id = 3, Type = "C" }
  new House { Id = 4, Type = "B" }
}

使用 Linq to Entities 我需要按类型排序房屋，但它应该是:

 Houses of Type C
 Houses of Type A
 Houses of Type B

如何做到这一点？

Answer 1

你可以链接吗？ : 操作符创建一个自定义排序，如下所示:

var query = from h in context.Houses
            orderby h.Type == "C" ? 0 : (h.Type == "A" ? 1 : 2)
            select h;

或者方法语法

var query = context.Houses.OrderBy(h => h.Type == "C" ? 0 : (h.Type == "A" ? 1 : 2))