WebDec 14, 2016 · Group byしてSum。 var query = from x in db.TableA group x by x.GroupName into A select new { A.Key, sum = A.Sum(a => (int)a.Price) }; JOINして複数キーでGroup ByしてSum いろいろな書き方出来ますが、例えば下記のような感じ。 FirstOrDefault ()の使い方がポイント。 WebDec 22, 2015 · このクラスのGroupByメソッドにリストを引数として渡すと アイテム名とサイズでGroupByを行いリストで返却するように作ってあります。 「group a by new { a.ItemName, a.Size }」の「 a.ItemName, a.Size 」の箇所に グループ化したい項目を記述していく感じになります。 実際にサンプルデータを作成してメソッドを実行した場合 …
C# - LINQ GroupBy Examples - CSharp Academy
WebJun 23, 2014 · GroupBy (m => m.PersonType). Select (c => new { Type = c.Key, Count = c.Count (), Total = c.Sum (p => p.BusinessEntityID) }); } public void GroupBy9 () { var … WebMay 1, 2011 · 2 Answers Sorted by: 34 Replace First () with Take (2) and use SelectMany (): List yetAnotherList = list.GroupBy (row => row.TourOperator) .SelectMany (g => g.OrderBy (row => row.DepDate).Take (2)) .ToList (); … software that boost fps
C# Language Tutorial => GroupBy Sum and Count
Web1. This will turn you list into a dictionary mapping from the first value to the sum of the second values with the same first value. var result = olst.GroupBy (entry => … WebSelect Department, SUM (Salary) as TotalSalary from Employee Group by Department Linq Query: var results = from r in Employees group r by r.Department into gp select new { … WebJan 25, 2024 · from entry in MyTable group entry by entry.Id into g select new { Id = g.Key, Sum = g.Sum(e => e.Value) }; Or, if you prefer a method chaining syntax: … software that allows conversion to vgz
C# list sum group by
WebFeb 22, 2014 · //group the invoices by invoicenumber and sum the total //Zoho has a separate record (row) for each item in the invoice //first select the columns we need into an anon array var invoiceSum = DSZoho.Tables ["Invoices"].AsEnumerable () .Select (x => new { InvNumber = x ["invoice number"], InvTotal = x ["item price"], Contact = x ["customer … WebFor grouping by hour you need to group by the hour part of your timestamp which could be done as so: var groups = from s in series let groupKey = new DateTime (s.timestamp.Year, s.timestamp.Month, s.timestamp.Day, s.timestamp.Hour, 0, 0) group s by groupKey into g select new { TimeStamp = g.Key, Value = g.Average (a=>a.value) }; Share
WebOct 22, 2015 · public static IQueryable GroupByColumns (this IQueryable source, bool includeVariety = false, bool includeCategory = false) { var columns = new List (); if (includeVariety) columns.Add ("Variety"); if (includeCategory) columns.Add ("Category"); return source.GroupBy ($"new ( {String.Join (",", columns)})", "it"); } WebTo group a list of items by month in C#, you can use the LINQ GroupBy method and the DateTime.Month property to extract the month number from a DateTime object. Here's an example: Here's an example: csharp var items = new List(); // assume this list contains items with a "Date" property var groupedItems = items.GroupBy(item => …
WebSep 15, 2024 · Grouping refers to the operation of putting data into groups so that the elements in each group share a common attribute. The following illustration shows the results of grouping a sequence of characters. The key for each group is the character. The standard query operator methods that group data elements are listed in the following … WebMay 1, 2015 · What I'm wanting to do is create a new list from the main list where I select a particular month, and the resulting list is now grouped by contactId and the duration is …
WebDec 20, 2024 · Use Sum () List foo = new List (); foo.Add ("1"); foo.Add ("2"); foo.Add ("3"); foo.Add ("4"); Console.Write (foo.Sum (x => Convert.ToInt32 (x))); … WebMay 4, 2009 · GroupBy (hit => hit.ItemID). Select (group => new Hit { ItemID = group.Key, Score = group.Sum (hit => hit.Score) }). OrderByDescending (hit => hit.Score); Share Improve this answer Follow answered May 4, 2009 at 15:33 Daniel Brückner 58.7k 16 98 143 Add a comment Your Answer Post Your Answer
WebOct 18, 2013 · You might want to get the list of distinct Group values from the DataTable first. Then loop through the list of Groups and call the function for each Group: dt.Compute ("Sum (Convert (Rate, 'System.Int32'))", "Group = '" + Group + "'"); Share Improve this answer Follow answered Oct 12, 2011 at 7:57 Fun Mun Pieng 6,681 3 28 30 Add a …
WebApr 11, 2024 · 今天需要在django上实现group by但是网上的例子在我的电脑上怎么都试不出来 例子： sql语句 select name,count(id) as counts from foo_personmodel group by name; django实现语句 PersonModel.objects.values("name").annotate(counts=Count(id)) 虽然语句是对的但是一直报错NameError: name 'Count' is not defined 然后才发现是少了 software that brings photos to lifeWebFeb 18, 2024 · Group by single property example. The following example shows how to group source elements by using a single property of the element as the group key. In … software that blocks websitesWebApr 1, 2024 · A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. software that boost gaming performanceWebDec 12, 2008 · var sums = Orders .GroupBy (x => new { x.CustomerID, x.ProductID }) .Select (group =>new {group.Key, ProductCount = group.Sum (x => x.ProductCount)}); … software that can download bank accountsWebBut you can use navigation property to perform join implicitly: db.ReturnRequests .Where (rr => rr.orderNumber == "1XX") .SelectMany (rr => rr.returnItems) .GroupBy (ri => ri.item) … slow moving road signWebDec 7, 2012 · List groupedList = TypeAList .GroupBy (a => a.identifierA) .Select (g => new TypeA () { identierA = g.Key, number = g.Sum (a => a.number) nestedList = g.SelectMany (a => a.nestedList) .GroupBy (b => b.identifierB) .Select (g2 => new TypeB () { identifierB = g2.Key, otherNumber = g2.Sum (b => b.otherNumber) } } Share software that can be used to create a wbsWebOct 20, 2009 · SELECT [cnt]=COUNT (*), [colB]=SUM (colB), [colC]=SUM (colC), [colD]=SUM (colD) FROM myTable This is an aggregate without a group by. I can't seem to find any way to do this, short of issuing four separate queries (one Count and three Sum). Any ideas? linq-to-sql Share Improve this question Follow asked Oct 20, 2009 at 20:42 … software that can be modified by the user