Datatable group by multiple columns c#
http://duoduokou.com/csharp/17561482170751830840.html WebJan 27, 2012 · var query = orders.AsEnumerable () .GroupBy (t => new {CountryCode= t.Field ("CountryCode"), CustomerName=t.Field ("CustomerName"), (key, group)=> new {CountryCode = key.CountryCode,CustomerName=key.CustomerName}) .Select (t => new {t.CountryCode, t.CustomerName}); Share Improve this answer Follow …
Datatable group by multiple columns c#
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WebDec 29, 2024 · A single student can have multiple addresses that's why after fetching the data from excel into data table I am first applying group by and then converting it into a dictionary. I have applied the group by on 2 columns StudentId and StudentTempId. Because of which two keys are getting created when converting to a dictionary. WebFeb 18, 2024 · The following example shows how to group source elements by using something other than a property of the object for the group key. In this example, the key is the first letter of the student's last name. C#. var groupByFirstLetterQuery = from student in students group student by student.LastName [0]; foreach (var studentGroup in ...
WebJul 13, 2014 · c # using linq to group by multiple columns in a datatable. Ask Question. Asked 11 years, 9 months ago. Modified 8 years, 8 months ago. Viewed 80k times. 7. I have three columns in a datatable: string, DateTime, and decimal. I want to group by the … WebDec 14, 2015 · In that case all you need (assuming your C# entities maps 1:1 with DB columns): var result = db.GroupBy (x => x.Type) .Select (x => new { Type = x.Key, Count = x.Sum (y => y.Count) }); Share Improve this answer edited Dec 16, 2015 at 7:36 answered Dec 14, 2015 at 16:20 Adriano Repetti 10.4k 1 21 46 I'm open to database changes as well
WebSep 23, 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. WebDec 9, 2014 · You can use this:-DataTable countriesTable = dt.AsEnumerable().GroupBy(x => new { CountryId = x.Field("CountryId"), CityId = x.Field("CityId") }) .Select(x ...
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 ...
WebMay 12, 2016 · A group by might be more suited to this scenario. It will group the columns into distinct rows and return a count if desired. i.e. var groups = table.GroupBy (_ => new {_.Key1, _.Key2, _.KeyN}) .Select (_ => new { key = _.Key, count = _.Count ()); This is untested code, but should help point you in the correct direction. green staff medical halifaxWebNov 5, 2016 · Either a (very) old version of data.table, or there was some other error. ?data.table says: " by - A single unquoted column name, a list () of expressions of column names, a single character string containing comma separated column names, or a character vector of column names." fnaf coffee potWebC# Datatable使用行修改列,c#,datatable,multiple-columns,C#,Datatable,Multiple Columns,我想在Datatable中修改我的表。 我知道我必须使用linq并对结果进行分组。 fnaf collection texture and sonudWebApr 9, 2024 · Into Group Select Group (0)).ToArray ().CopyToDataTable () Create a Create a List of strings ListA= (From p In DT1.AsEnumerable () Group By x= New With { Key.a =p.Item (“OrderID”),Key.b=p.Item (“SerialNo”)} Into GroupA= Group Select Convert.ToString (GroupA.Sum (Function (x) Convert.ToDouble (x.Item (“Amount”).ToString)))).ToList () fnaf coffin memeWebDec 22, 2010 · RowGroup provides the ability to group data a multiple levels. This example shows the rowGroup.dataSrc option being used as an array to specify the Office as the top level group and Position as the second level. A little CSS is used to indent the first column to reflect the visual nesting of data (click the "CSS" tab below to view). fnaf coffeeWebMar 16, 2013 · var result = from r in dtResults.AsEnumerable () group r by r.Field ("ID") into IdGroup let row = IdGroup.First () select new { ID = IdGroup.Key, Age = row.Field ("Age"), LastName = row.Field ("Last_Name"), FirstName = row.Field ("First_Name"), MotherName = row.Field ("Mother_Name"), FatherName = row.Field ("Father_Name"), Marks = … greenstaff medical loginWebApr 25, 2013 · The DataTable.Select returns an array of DataRow so providing that your columns exist in your DataTable then you will return all the columns in that row anyway. The .Select is to be used with a WHERE clause so you can do something like this: DataRow [] rows = ProductRangesDt.Select ("PROVIDER_ID = " + PROVIDER_ID); fnaf clothing for kids