LINQ Group通过匿名键入并选择+/-一分钟以内的时间戳

Question

我有一个答案列表，我通过将FormId，ProductInstance和最后由TimeStamp匹配来进行分组，如下所示：

var groups = answersForCustomerList.GroupBy(x => new { x.FormId, x.ProductInstance, x.TracingData.Timestamp });

这给了我这样的团体：

FormId = {97748e5e-be41-4d53-9ef8-f0dc150e58b6}, ProductInstance = "kontot", Timestamp = {2016-12-20 16:00:00}
FormId = {87dd356b-2770-4427-89d2-7503ee80bb1c}, ProductInstance = "Lån", Timestamp = {2016-12-20 16:02:00} 
FormId = {87dd356b-2770-4427-89d2-7503ee80bb1c}, ProductInstance = "Lån", Timestamp = {2016-12-20 16:01:00} 
FormId = {97748e5e-be41-4d53-9ef8-f0dc150e58b6}, ProductInstance = "Konto", Timestamp = {2016-12-20 15:00:00}
FormId = {87dd356b-2770-4427-89d2-7503ee80bb1c}, ProductInstance = "Lån", Timestamp = {2016-12-20 15:59:00}

但是我需要做的事情似乎无法弄清楚如何将+/- 1分钟以内的时间戳分组到同一组中。 因此，具有相同FormId和ProductInstance但具有TimeStamp 16:01:00或15:59:00的答案与16:00:00组处于同一组。

Answer 1

我设法得到了我想要的东西：

 var groups = answersForCustomer
            .GroupBy(x =>
            {
                var stamp = x.TracingData.Timestamp;
                stamp = stamp.AddMinutes(-(stamp.Minute % 2));
                stamp = stamp.AddMilliseconds(-stamp.Millisecond - 1000 * stamp.Second);
                return new { stamp, x.FormId, x.ProductInstance };
            });

这使我可以提前2分钟到达小组，感谢所有答案！