Kapusons.Select 1.1.0

.NET 6.0 .NET Standard 2.0
dotnet add package Kapusons.Select --version 1.1.0
NuGet\Install-Package Kapusons.Select -Version 1.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Kapusons.Select" Version="1.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Kapusons.Select --version 1.1.0
#r "nuget: Kapusons.Select, 1.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Kapusons.Select as a Cake Addin
#addin nuget:?package=Kapusons.Select&version=1.1.0

// Install Kapusons.Select as a Cake Tool
#tool nuget:?package=Kapusons.Select&version=1.1.0

select-options (aka ks-select)


Augments linq IQueryable Select capabilities with configurable options to allow build composable projections, based on conditional constructs.

works virtually with any linq provider and linq-based framework (linq to objects, ef6, ef-core, etc.), because it simply generates an expression tree for the IQueryable Select method.

	query.Select<Product, ProductInfo>(options =>
		options.Include(it => it.Category, it => categoryQuery.Where(c => c.Id == it.CategoryId).Select(c => c.Name).FirstOrDefault());
		options.Exclude(it => it.Description);


Conditionally exclude or include columns

	if (excludeBinaryData) query = query.Select(options => { options.Exclude(it => it.BinaryData); });
	if (includeOrderCount) query = query.Select(options => { options.Include(it.OrderCount, it => orderQuery.Count(o => o.ProductId == it.Id)) });


	query = query.Select(options =>
		if (excludeBinaryData) options.Exclude(it => it.BinaryData);
		if (includeOrderCount) options.Include(it.OrderCount, it => orderQuery.Count(o => o.ProductId == it.Id));

The extra columns can be applied either to the original entity (usually those columns are not mapped to the data store and are marked with the [NotMapped] attribute) or to a distinct type (see the demo project for an example)

AutoMapper-like projection

Properties with a matching name are automatically mapped from the original type to the target type. Supports complex type properties.

Provider agnostic

Works virtually with any linq provider and linq-based framework (linq to objects, ef6, ef-core, etc.), because it simply generates an expression tree for the IQueryable Select method.

Scoping and Chaining

The target projection can be obtained through (multiple, chained) internal query tranformations without changing the type of the original IQueryable<T>:

	protected IQueryable<Book> ApplyFilter(IQueryable<Book> query, BookFilter parameters, SelectOptionsContext<Book> filterContext)
		if (parameters.IncludeAuthorName)
			var options = filterContext.UseSelectOptions();

			var authorsQuery = Context.GetAuthorsQuery();

			options.Include(it => it.AuthorName, it =>
				authorsQuery.Where(g => g.Id == it.AuthorId)
					.Select(it => it.FirstName + " " + it.LastName)

		if (parameters.IncludeAuthorInfo)
			filterContext.UseScoped<BookAuthorJoin>((options, q0) =>
				var joinedQuery = q0.Join(Context.GetAuthorsQuery(),
					b => b.AuthorId,
					a => a.Id,
					(b, a) => new BookAuthorJoin { Book = b, Author = a });
				options.Include(book => book.AuthorInfo, it => new AuthorInfo
					FirstName = it.Author.FirstName,
					LastName = it.Author.LastName,
					BookSells = Context.GetBooksQuery().Count(x => x.AuthorId == it.Author.Id),
				return joinedQuery;
			}, it => it.Book);

		// replace Title and Description fields with localized versions from BooksLocalization (demonstrated in the sample project)
		if (CultureInfo.CurrentUICulture.Name != DefaultLanguage)
			filterContext.UseScoped<BookLocalizationJoin>((options, q0) =>
				var joinedQuery = q0.Join(Context.GetBooksLocalizationQuery(),
					b => b.Id,
					l => l.BookId,
					(b, l) => new BookLocalizationJoin { Book = b, Localization = l });
				options.Include(book => book.Title, it => it.Localization.Title);
				options.Include(book => book.Description, it => it.Localization.Description);
				return joinedQuery;
			}, it => it.Book);

		// ...

		query = query.ApplySelectOptions(filterContext);

		return query;
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
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NuGet packages

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Version Downloads Last updated
1.1.0 92 5/18/2023
1.0.4 113 4/29/2023
1.0.3 117 4/14/2023
1.0.2 137 4/3/2023
1.0.1 167 3/12/2023
1.0.0 175 2/19/2023