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C# list group by multiple columns

WebApr 23, 2024 · or you can write linq group by multiple columns to list in c# as shown below. var result = from o in db group o by (o.Column1, o.Column2) into g select new { … 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 ...

c # using linq to group by multiple columns in a datatable

WebDec 13, 2024 · SelectMany collapse the nested sequences into a IEnumerable Update: Given your edit, you're looking for: var myList = uData.GroupBy (x => new {x.Input, x.CreatedBy}) .SelectMany (x => x.GroupBy (z => z.Output).Skip (1)) .SelectMany (x => x); Share Improve this answer Follow edited Dec 13, 2024 at 19:38 answered Dec 13, 2024 … 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 … fonehotmail https://esuberanteboutique.com

c# - Linq order by, group by and order by each group? - Stack Overflow

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" }; WebOct 30, 2014 · // as per OP, the list of columns to group by will be generated at runtime IEnumerable columnsToGroupBy = ...; you can use the NTuple class to group by those columns like this: var groups = dt.AsEnumerable () .GroupBy (r => new NTuple (from column in columnsToGroupBy select r [column])); Here's the beef:WebApr 23, 2024 · or you can write linq group by multiple columns to list in c# as shown below. var result = from o in db group o by (o.Column1, o.Column2) into g select new { …WebJul 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.WebFeb 22, 2014 · The table has 40+ columns consisting of invoice details. Each row is a separate line item within an invoice, which can consist of 1 to n rows. The query is used to group the invoice details into a single row per invoice, …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 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 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.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, …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 ...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 …WebHow to dynamically group list by multiple columns and create pivot table with NReco PivotData .NET library. ... NReco.PivotData can group any .NET collection and …WebMar 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 64WebJan 7, 2008 · The first query is used to force a simple select query on the database and return only the records that you want to group. Generally group by queries call the database multiple times so querying in this way is usually much faster.WebOct 10, 2015 · I need to group by two of the columns, whilst then concatenating the other two fields with a ', ' separator. The basis for the grouping is the same for the two tables however groups on different sets of columns, so I am assuming I can apply the solution to one instance to the other as well. I have the following DataTable in code: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" …WebApr 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.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: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 …WebDec 13, 2024 · SelectMany collapse the nested sequences into a IEnumerable Update: Given your edit, you're looking for: var myList = uData.GroupBy (x => new {x.Input, x.CreatedBy}) .SelectMany (x => x.GroupBy (z => z.Output).Skip (1)) .SelectMany (x => x); Share Improve this answer Follow edited Dec 13, 2024 at 19:38 answered Dec 13, 2024 …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 }WebLINQ Group By into a Dictionary Object. I am trying to use LINQ to create a Dictionary> from a List. I can get this to work using "var", but I don't want to use anonymous types. Here is what I have. var x = (from CustomObject o in ListOfCustomObjects group o by o.PropertyName into t select …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 …WebFunction with multiple return values; Functional Programming; Garbage Collector in .Net; Generating Random Numbers in C#; Generic Lambda Query Builder; Generics; Getting …WebMar 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 3.00WebJun 20, 2024 · 4. DataTable dt = GetDataTableFromExcel (); List dts = dt.AsEnumerable () .GroupBy (row => row.Field ("OUTLET NAME ")) .Select (g …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" };WebDec 8, 2024 · Answers ( 11) Android Write and Read Text File in C#. When adding PK column in group by multiple column duplicate data linq.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 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 … fone headset usb h390 logitech

Group By multiple Columns in DataTable using LINQ in C

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C# list group by multiple columns

c# - LINQ : Group by Multiple Columns with Maximum for one column …

WebJul 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. WebOct 10, 2015 · I need to group by two of the columns, whilst then concatenating the other two fields with a ', ' separator. The basis for the grouping is the same for the two tables however groups on different sets of columns, so I am assuming I can apply the solution to one instance to the other as well. I have the following DataTable in code:

C# list group by multiple columns

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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 … WebFeb 22, 2014 · The table has 40+ columns consisting of invoice details. Each row is a separate line item within an invoice, which can consist of 1 to n rows. The query is used to group the invoice details into a single row per invoice, …

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, … 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.

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:

WebFunction with multiple return values; Functional Programming; Garbage Collector in .Net; Generating Random Numbers in C#; Generic Lambda Query Builder; Generics; Getting … eigrp peer termination receivedWebMar 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 fone hopeWebDec 8, 2024 · Answers ( 11) Android Write and Read Text File in C#. When adding PK column in group by multiple column duplicate data linq. f-one high modulus carbon mastWebJul 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 … fone hospital cemaWebYou 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 … eigrp path costWebApr 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. eigrp path selectionWebMay 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: eigrp path manipulation