问题:LINQ Group By Multiple fields -Syntax help 答案: LINQ(Language Integrated Query)是一种集成在.NET Framework和.NET Core中的查询语言,可以用来执行基于集合的操作,如对数组、列表、集合、字典、文件等数据源进行查询、过滤、排序、分组、聚合等操作。 LINQ Group By Multiple fields语法可以帮助您...
Order By (with multiple fields)ThenBy Order By … Descending (with multiple fields)ThenByDescending SelectSelect SkipSkip TakeTake Take WhileTakeWhile WhereWhere Creating Sequences The Enumerable class provides several Shared methods that are not extension methods but exist for you to create new sequence...
string[] lines = File.ReadAllLines("spreadsheet1.csv");// Create the query. Put field 2 first, then// reverse and combine fields 0 and 1 from the old fieldIEnumerable<string> query =fromlineinlinesletfields = line.Split(',')orderbyfields[2]select$"{fields[2]},{fields[1]}...
Order By OrderBy Order By … Descending OrderByDescending Order By (with multiple fields) ThenBy Order By … Descending (with multiple fields) ThenByDescending Select Select Skip Skip Take Take Take While TakeWhile Where WhereCreating SequencesThe...
string[] lines = File.ReadAllLines("spreadsheet1.csv");// Create the query. Put field 2 first, then// reverse and combine fields 0 and 1 from the old fieldIEnumerable<string> query =fromlineinlinesletfields = line.Split(',')orderbyfields[2]select$"{fields[2]},{fields[1...
C# Linq Group By on multiple columns C# LINQ List<KeyValuePair<string, KeyValuePair<int, int>>> Group by to List<KeyValuePair<string, List<KeyValuePair<int, int>>> C# LINQ one condition, return multiple columns and rows C# LINQ order by not working for a SQL table with a primary ke...
Order of Operations The LinqDataSource control applies data operations in the following order: Where (specify which data records to return). Order By (sort). Group By (aggregate data records that share values). Order Groups By (sort grouped data). Select (specify which fields or properties to...
var contacts = from a in context.Addresses orderby a.Contact.LastName select new {a.Contact.LastName, a.Contact.FirstName, a.Street1, a.City}; This will result in a single type with four properties, but contacts with multiple addresses will appear multiple times, as you can see in this...
ORDER BY [t0].[ProductName]',N'@p0 nvarchar(9)',@p0=N'Beverages' The profiler window should be like this diagram: From the profiler, we know under the hood that LINQ actually calledsp_executesql, and it also used a left outer join to get the categories of products. ...
It has aDELETE CASCADEfrom Books to BookAuthors so deleting a book deletes its authors, but no otherCASCADEs so you can't delete an Author or Category if it has any books. All fields require values except forBooks.Category, which can benull. ...