using System.Linq;//引入命名空間
查詢
var result = from l in list(查詢的集合)
where l.property對比條件
select l;
排序
var result = from l in list
where 條件
orderby 排序的屬性,屬性,屬性(字符串也可以排序) descending(降序)
select l;
聯合查詢
var resultb = from l1 in list1
from l2 in list2
where 條件
select new{l1,l2}
join on
var resultb = from l1 in list1
join l2 in list2 on l1.?? equals l2.?? 連接條件
where 條件
select new{l1,l2}