Select more than one column in linq c#

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WebJul 19, 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 table_name group by account_id -- having count (1) > 1 having min (id) <> max (id) -- variation with same result ) as c join table_name as t on t.account_id = c.account_id ; Share Improve this answer WebApr 11, 2024 · You have ASP.NET and C# in your tags. Considering that what you intend to do is a presentational issue, do it in the presentation layer (i.e. with C#) and not in the data layer (i.e. with SQL). That's a lot easier, too. For example, like shown here: Use LINQ to concatenate multiple rows into single row (CSV property)

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WebOct 10, 2009 · List users = (from a in dc.Benutzer select new Benutzer{ myCol= a.myCol, myCol2 = a.myCol2 }).ToList(); I think that's what you want if you want to make … WebNov 5, 2013 · 2. 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 r.Field (ColumnName).Contains ("test1,test2") select r ).ToList (); Here ColumnName is my Datatable's column name and "test1, test2" are different values ( number of values … cruise ships venice 2015

c# - linq group by and select multiple columns not in group by

WebSyntax of LINQ Select It is used to select one or more items from the list of items or all the items in the collection. Let’s see the syntax of both in Query and Method types as follows: … WebSelect operator is mainly used to retrieve all properties or only a few properties which we need to display. It is used to select one or more items from the list of items or from the collection. We can retrieve the result as per our requirement using LINQ Select. By using the Select operator, we can shape the data as per our needs. WebApr 14, 2024 · The logic to transform the data into an List of Expando objects is implemented in the two private methods of my data access layer (see below). The public interface just contains parameterized methods to fetch the data (which is the way I usually write this sort of thing anyway). build wall cabinets for garage

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LINQ Select How Select Works in LINQ with Examples?

WebApr 14, 2024 · The logic to transform the data into an List of Expando objects is implemented in the two private methods of my data access layer (see below). The public … WebJul 18, 2016 · 4. I'm trying to select multiple columns not in a group by using linq - c#. Using linq, I'm trying to group by ISNULL (fieldOne,''),ISNULL (fieldTo,'') and then select field_One, field_Two, field_Three for each group. So for each row that the group by would return, I want to see numerous rows. So far I have the following, but can't seem to ... build walletWebDec 6, 2024 · The first output table is the first input table with one extra column (STATUS) from the 2nd input table with values mentioned only for rows in which there is a match (i.e. LEFT JOIN) The 2nd output table it’s INNER JOIN on PLCNO, DDNO and EML columns. RQUIRED Separate LINQ queries for both outputs cruise ships vancouver to alaska

"WebNov 30, 2013 · SELECT count (*), article_title FROM articles GROUP BY article_title HAVING COUNT (*) > 1; Adding columns to the SELECT and GROUP BY clauses allow you to locate duplicates based on a composite key of multiple columns. Share Improve this answer Follow answered Nov 30, 2013 at 5:28 sqlreader 686 4 5 2 " - Select more than one column in linq c#

Select more than one column in linq c#

c# - linq group by and select multiple columns not in group by

WebDec 23, 2015 · Multiple values in 1 parameter using LINQ. i have a List "_DataInfo" i need to filter it with only those id's which is in the string "_id", please help me to write a query using linq to get the result. Are you looking for x.ID == "111,222,333" or x.ID == "111" or "222" or "333". If the former, then you already have it right. WebNote that the Select method returns a new sequence and does not modify the original collection. If you want to modify the original collection, you can use the ForEach method instead of Select. More C# Questions. Programmatically Open Word Document Located in the Computer in C#

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WebOct 7, 2024 · According to your description and code, you could refer to the following code to select some columns. public class MYRInfo { public string Month; public string Year; public string ReportType; } return custQuery.Select (item => new MYRInfo { Month = item.Month, Year = item.Year, ReportType = item.ReportType, } ).ToList (); WebFeb 18, 2024 · Grouping is one of the most powerful capabilities of LINQ. The following examples show how to group data in various ways: By a single property. By the first letter …

WebSep 22, 2024 · SELECT multiple columns from DataTable using LINQ in C# and VB.Net A function named GetData is used to fetch the records from the Customers table and return … WebRemoving the use of SingleOrDefault shouldn't change the nature of the code, since the Distinct on the LINQ already prevents any duplicate values. Also, by using a HashSet, this should be quite quick. As to your primary concern, the list of valid types is now only in one line (or block) of code, rather than spread across the entire method.

WebYou 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 type here is the … WebYou can use LINQ to select all Parent objects where any Child object has a specific name, like this: csharpList parents = GetParents(); // Method to retrieve parent objects string childName = "Alice"; List result = parents.Where(p => p.Children.Any(c => c.Name == childName)).ToList(); In this example, the parents collection is ...

WebSelect 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.

WebSep 21, 2016 · One of the biggest problems that I’ve seen developers make is retrieving too many columns in a call to the database. I know what you’re thinking, “Why in the world would they retrieve more columns than they need?” Well, because it’s easy. Let’s try and get all of the rows in a table using Entity Framework. 1 2 3 4 5 6 cruise ships visiting greenockWebAbove, the first statement uses the ARRAY constructor to construct an array and insert data into the Person table.. The array can be added using curly braces { }.In second statement, … cruise ships visiting greenock 2022WebThis 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 … build wall mexico military budgetWebJun 27, 2024 · In UI layer I populate combobox - ComboBox1.ItemsSourse = units. But I would like to specify ComboBox by: ComboBox.DisplayMemberPath = units SelectValuePath = unitId Binding Path = unitId For that I would like to retrieve two columns from this method. Thanks. Edited by zleug Thursday, June 25, 2024 10:08 PM Thursday, June 25, 2024 10:03 … cruise ships virtual tourWebFeb 18, 2024 · Grouping is one of the most powerful capabilities of LINQ. The following examples show how to group data in various ways: By a single property. By the first letter of a string property. By a computed numeric range. By Boolean predicate or other expression. By a compound key. build wall mounted bookcaseWebAbove, the first statement uses the ARRAY constructor to construct an array and insert data into the Person table.. The array can be added using curly braces { }.In second statement, an array is added using curly braces. When you use curly braces, use single quotes ' ' to enclose the array and double quotes " "to wrap text items.. The third statement adds a single value … build wall length desk cruise ship surge protector