Linq select more than one column

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August undefined, 2024

Nettet19. jan. 2024 · Solution 1 C# ListOfFruits.FirstOrDefault (x => x.Name == "Apple" ).ID You could also load the FirstOrDefault into an object and check for null before trying to access the id. As suggested, in order to avoid a NullRef exception you can do a couple of things: If you are using a version of VS with the Roslyn compiler: C# NettetYou can select to an anonymous type, for example. var dataset2 = (from recordset in entities.processlists where recordset.ProcessName == processname select new { …

Select multiple columns in a LINQ query - codecompiled.com

Nettet10. okt. 2009 · Simple Linq question: How to select more than one column? Ask Question Asked 13 years, 6 months ago Modified 13 years, 6 months ago Viewed 19k times 10 my code is: List users = (from a in dc.Benutzer select a).ToList (); … Nettet15. jul. 2024 · Select is a LINQ functionality to define a data format of the query results. Each of below examples is presented in C# with both Lambda and Query expression. Let’s create a Person class. 1 2 3 4 5 6 public class Person { public string Forename { get; set; } public string Surname { get; set; } public DateTime DateOfBirth { get; set; } } gotham media group

Select multiple columns in a LINQ query - codecompiled.com

NettetHere’s the SQL we want to duplicate in LINQ: SELECT Author, Category, COUNT (ID) As RecipeCount FROM Recipes GROUP BY Author, Category This will create the following output: [table id=4 /] In order to group by multiple columns, the structure of our queries is basically the same as before. Nettet16. jul. 2024 · But if now we want to select multiple Dept and Name fields then we can not use this since this will be invalid syntax in LINQ: var selectedLst=from item in … NettetThis can be done by using the GroupBy method in LINQ (Language Integrated Query) to group data from a database table based on one or more columns. The grouped data can then be used for further processing, such as aggregating the … chiffre bpco

Selecting multiple columns with linq query and lambda expression

LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?

Nettet14. feb. 2024 · LINQ Distinct by Field If you want to achieve the distinct values for a specific field in the list, you can use the following two methods: 1. Using GroupBy and Select functions In this approach, you need to use two LINQ functions i.e., GroupBy and Select to get the list of unique field values. Nettet7. okt. 2024 · LINQ to SQL join 3 tables and select multiple columns Archived Forums 1-20 > ADO.NET, Entity Framework, LINQ to SQL, Nhibernate Question 0 Sign in to vote User1848768891 posted hi i have three tables, Stock, InStock, OutStock tables columns: - Stock: IdStock,CodeStock, Date - InStock: Id_InStock, IdStock, mount_InStock chiffre cabinet occurrenceNettetI need to do a LINQ2DataSet query that does a join on more than one field (as var result = from x in entity join y in entity2 on x.field1 = y.field1 and x.field2 = y.field2 I have yet … chiffre but

"Nettet8. mar. 2011 · Given the two classes above, I would like to use LINQ to create a List from the List, grouped by the School, Friend and FavoriteColor properties. Is this possible … " - Linq select more than one column

Linq select more than one column

C# LINQ: How to select multiple field and return list

Nettet10. aug. 2014 · Selecting multiple columns with linq query and lambda expression. I'm new to C# ASP.NET, and am working on my first application. I'm trying to create a linq … Nettet18. jul. 2024 · Or use a subquery to find the accounts that have more than one occurrences and then join to the table: select t.* from ( select account_id from …

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Nettet15. mar. 2011 · ColumnC. I have SQL query where TABLE_1 joins on itself twice based off of ColumnA, ColumnB, ColumnC. The query might look something like this: Select … Nettet30. sep. 2013 · You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. If you want to avoid this anonymous …

NettetI have to select specific column from my DataTable using linq I am using this code. ds.Table[0].AsEnumerable().Where(r=>r.Field("productID")==23).CopyToDataTable(); … Nettet11. mai 2009 · For Group By Multiple Columns, Try this instead... GroupBy(x=> new { x.Column1, x.Column2 }, (key, group) => new { Key1 = key.Column1, Key2 = …

Nettet21. sep. 2024 · Between the first from clause and the last select or group clause, it can contain one or more of these optional clauses: where, orderby, join, let and even additional from clauses. You can also use the into keyword to enable the result of a join or group clause to serve as the source for additional query clauses in the same query … Nettetproduct.Select(m => new {m.CategoryId, m.CategoryName}).Distinct(); which logically it should create an anonymous object with CategoryId and CategoryName as properties. …

Nettet25. jan. 2014 · 9. var items = db.tblPosts .GroupBy (x => x.UserId) .Select (g => new { UserId = g.Key, Title = g.FirstOrDefault ().Title }) .ToList (); It will return first Title for …

Nettet31. jul. 2011 · LINQ to Entities cannot understand this, so it has no idea that we are only using a fraction of the information it is bringing back. This brings us back to using a Select statement that LINQ to Entities is happy with. I’m going to use an anonymous type for that. The code then changes to this: gotham medical associatesNettet25. aug. 2024 · I've written a LINQ query shown below : List actions = resourceActions.Actions.Select(s => s.ActionName).ToList(); How do I give for … chiffre cancer 2022Nettet5. nov. 2013 · I need to find data from data table with multiple values from one column only. Below is an example: var Value = (from r in datatable.AsEnumerable () where … chiffre burn out parentalNettetSelect query in LINQ Select method is used to select one or more items from collection or list object, here we see some example of linq select statement . variableName.Select (s => s.Name); There are various ways we can select some records or single record from a collection object. chiffre burn out france 2022 chiffre calligraphieNettet29. mar. 2013 · Try can also try grouping personnel into a single query. var groups = (from p in Personnel group p by p.CountryId into g select new { CountryId = g.Key … gotham medical associates nycNettet23. mar. 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip (second, (f, s) => new Type [] {a, b}) .SelectMany (x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany. chiffre cancer 2020