WebYou can use the GroupBy method in LINQ with C# to group elements in a collection based on multiple columns. Here's an example: Suppose you have a collection of objects … WebApr 12, 2015 · var result = tstPData.GroupBy (x => new { x.PersonnelId, x.Name , x.Position }) .Select (x => new { PersonnelId = x.Key.PersonnelId, Name = x.Key.Name, Position = x.Key.Position , JobCount = x.Count (), DaysCount = x.Count () }); Finally you can enumerate over the result and assign to your Model. Update:
LINQ GroupBy multiple columns and Count - Stack Overflow
WebJul 1, 2024 · Group by Multiple Columns in LINQ Queries Using C#. In the same way, we can also group the data based on some attribute. This is done using the GroupBy clause … WebMar 7, 2011 · C# Linq Group By on multiple columns [duplicate] Ask Question Asked 12 years, 1 month ago. Modified 2 years, 3 months ago. Viewed 752k times ... C# Linq Join 2 tables on multiple columns and GROUP BY for count. 3. Selecting "custom distinct" … rodrigo santoro hoje
Group query results (LINQ in C#) Microsoft Learn
WebJul 14, 2014 · var objectTable = new DataTable (); objectTable.Columns.Add ("resource_name",typeof (string)); objectTable.Columns.Add ("day_date",typeof (DateTime)); objectTable.Columns.Add ("actual_hrs",typeof (decimal)); objectTable.Rows.Add (1, DateTime.Today, 1); objectTable.Rows.Add (2, … WebMay 20, 2016 · Sorted by: 42 It seems to me that you just need a projection from "entry" to "effective fee" which you can sum - something like: var result = source .GroupBy (x => x.Currency) .Select (g => new { Currency = g.Key, Total = g.Sum (x => x.FeesCustom > 0 ? x.FeesCustom : x.FeesNormal) }); That's equivalent to: WebMay 10, 2009 · Though this question is asking about group by class properties, if you want to group by multiple columns against a ADO object (like a DataTable), you have to … rodrigo tx dgk
C# list group by multiple columns
WebMulti-Group Column Count Linq. Conceptually, this is similar to a two column SQL Table with columns A, B. I'm trying to create a linq expression that would produce the three column result set of this T-SQL on such a conceptual table: var result = from MyObjs in MyList group MyObjs by new { MyObjs.A, MyObjs.B } into g select new { g.Key.A, g.Key ...
WebMar 20, 2024 · 2 Answers Sorted by: 2 First try to get the columns you need projecting the result in an anonymous type: var query= from r in output let columns= r.Split (';') select new { c1 =columns [0], c2 =columns [1], c3 = columns [2] ,c5=columns [4]}; And then create the groups but now using the anonymous object you define in the previous query: WebDec 14, 2015 · First and most obvious issue is usage of ToList(), it's not required and you force creation of multiple (and possibly big) lists moreover you're repeating almost same …
WebNov 23, 2016 · 2 Answers Sorted by: 15 Books = g.ToList () //Actually this line of is not working Probably because Books property is type of List, not List. Can you please try this query, I added b.Select (bn => bn.BookName).ToList () to extract only names of books: WebI have a list of this class: List persons; And this list can have multiple instances with same PersonID s, for example: persons [0] = new Person { PersonID = 1, car = "Ferrari" }; persons [1] = new Person { PersonID = 1, car = "BMW" }; persons [2] = new Person { PersonID = 2, car = "Audi" };
WebI have an object that looks something like this: public class Student { public string Name { get; set; } public int Grade { get; set; } } I would like to create the following query: group grades by student name, order each student group by grades, and order groups by max grade in each group. WebDec 29, 2024 · Below code I have written to fill all the excel data in an object: Dictionary, List> StudentDetailList = dataTable.AsEnumerable () .GroupBy (row => Tuple.Create ( row.Field ("StudentId"), row.Field ("StudentTempId") )).
WebNov 20, 2015 · That one is using multiple columns and selecting the group into a new one, I need to group using the list values. I did try grouping using some ideas from there however, couldn't make it work. ... C# Linq Group By on multiple columns. 67. Getting hash of a list of strings regardless of order. 0. Using LINQ GroupBy to group by …
WebMay 4, 2024 · var group1 = from a in context.asset group a by new { a.hq_org_id, a.command_org_id, a.region_org_id, a.installation_org_id, a.site_org_id // I am not sure how to get the count } into asset select new { // I cannot figure out how to join } rodrigo tenorioWebThe GroupBy (IEnumerable, Func) method returns a collection of IGrouping objects, one for each distinct key … rodrigo trevino goldman sachsWebDec 8, 2024 · Answers ( 11) Android Write and Read Text File in C#. When adding PK column in group by multiple column duplicate data linq. rodrigo varandaWebApr 23, 2024 · This post show you how to use linq group by multiple columns in c#. var result = from o in db group o by (o.Column1, o.Column2) into g select new (g.Key.Column1, g.Key.Column2, Total: g.Sum(o => o.Quantity)); or you can write linq group by multiple columns to list in c# as shown below. tesla zulassungWebJul 18, 2014 · LINQ : Group by Multiple Columns with Maximum for one column. I have query below in SQL. Tried using different options in linq to get the exact matching result from SQL to my Center code, here is my code using linq. But could not get it. Select prdCode, Max (prdID) from products GROUP BY prdCode order by prdCode. tesla x suv redWebMar 4, 2014 · List result = pr .GroupBy (g => new Tuple (g.Title, g.Price)) .Select (x => new ProductGroup () { Title = x.Key.Item1, Price = x.Key.Item2, Colors = x.Value.Select (y => y.Color) }) .ToList (); Share Improve this answer Follow answered Mar 4, 2014 at 20:15 JoeBrockhaus 2,735 2 40 64 tesla xt mini manualWebMar 25, 2013 · C# Linq Group By on multiple columns [duplicate] (2 answers) Closed 10 years ago. I have a collection of items, here it is: AgencyID VendorID StateID Amount Fee 1 1 1 20.00 5.00 1 1 1 10.00 2.00 1 1 1 30.00 8.00 2 2 1 20.00 5.00 2 2 1 5.00 5.00 1 1 2 20.00 5.00 2 2 2 20.00 5.00 2 2 2 40.00 9.00 1 2 2 35.00 6.00 1 2 2 12.00 3.00 tesla 改色