问题描述
在点表达式中使用与查询表达式中相同的匿名类型:
var qry = cust.GroupBy(cm => new { cm.Customer, cm.OrderDate },
(key, group) => new { Key1 = key.Customer, Key2 = key.OrderDate,
Count = group.Count() });
(在真正的IDE中,我将(key, group)
在该cm
参数下排队,但随后它将包裹在SO中。)
解决方法
例如2 以便按多列分组需要进行的更正是什么
例子1
var query = from cm in cust
group cm by new { cm.Customer,cm.OrderDate } into cms
select
new
{ Key1 = cms.Key.Customer,Key2=cms.Key.OrderDate,Count=cms.Count() };
示例2(不正确)
var qry =
cust.GroupBy(p => p.Customer,q => q.OrderDate,(k1,k2,group) =>
new { Key1 = k1,Key2 = k2,Count = group.Count() });