WebSep 1, 2024 · LINQ GroupBy operators create a result of type IGrouping where TKey and TElement could be any arbitrary type. Furthermore, IGrouping implements IEnumerable, which means you can compose over it using any LINQ operator after the grouping. Web回想一下，由GroupBy調用形成的每個組都是一個IGrouping ，它實現了IEnumerable 。 在此處閱讀有關IGrouping更多信息。 您可以訂購這些並選擇第一個：
How to use order by, group by in c#? - TutorialsPoint
Webvar summaryApproach1 = transactions.GroupBy (t => t.Category) .Select (t => new { Category = t.Key, Count = t.Count (), Amount = t.Sum (ta => ta.Amount), }).ToList (); Console.WriteLine ("-- Summary: Approach 1 --"); summaryApproach1.ForEach ( row => Console.WriteLine ($"Category: {row.Category}, Amount: {row.Amount}, Count: … Web如果你把orderby放在groupby之后有关系吗？MSDN显示的是 Datetime.Month 是一个数字，因此应该正确使用该数字进行订购。很抱歉，我原来的LINQ代码不正确。已更新月份名称很重要。它显示在我的XAML中。我有一个绑定到组的ListView，该键被用作组头。 systems people
C# LINQ orderby和组_C#_Linq - 多多扣
WebJun 2, 2024 · group stu by stu.standard into egroup orderby egroup.Key select new { Key = egroup.Key, studentobj = egroup.OrderBy (g => g.name) }; foreach (var group in resultorderbyelement) { … WebJust call the OrderBy () method and supply the object or the member of the object to sort by, and a sorted list will be returned. And of course you can do it just as easy with strings, as we'll see in the next example, but let's get the items in descending (from largest to smallest/from Z to A) order: List cityNames = new List () { WebNov 29, 2024 · So we have a three-step LINQ query, where we group, and then sort each group, and then sort the groups. var results = data.GroupBy (x => x.Name) // group by name .Select (g => g.OrderBy (x => x.Time)); // sort each group .OrderBy (g => g.First … systems painters new ulm texas