linq按小時範圍？

Question

我組我的資料按小時是這樣的：

group c by new { date = new DateTime(Date.Year, Date.Month, Date.Day, Date.Hour, 5, 0), name = c.Name } into g 

我想是這樣的：10.05 - 11.05當我調試的代碼，日期返回喜歡我的預期。但數據仍然在10.00 - 11.00之間分組。

我希望我能解釋一下。這樣做的邏輯是什麼？

謝謝。

Answer 1

let offSetDate = Date.AddMinutes(-5) //shift back so that Year,Month,Day,Hour are all that matter. 
let groupKey = new { 
    date = new DateTime(offSetDate.Year, offSetDate.Month, offSetDate.Day, offSetDate.Hour, 5, 0), 
    name = c.Name 
} 
group c by groupKey into g 

Answer 2

var groups = dList.GroupBy(d => (d.Ticks - 5*TimeSpan.TicksPerMinute)/TimeSpan.TicksPerHour) 
       .Select(g => g.ToList()) 
       .ToList();