Linq.Expression.Optimizer 1.0.13

.NET Standard 1.6 .NET Framework 3.5
There is a newer version of this package available.
See the version list below for details.
dotnet add package Linq.Expression.Optimizer --version 1.0.13
NuGet\Install-Package Linq.Expression.Optimizer -Version 1.0.13
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="Linq.Expression.Optimizer" Version="1.0.13" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Linq.Expression.Optimizer --version 1.0.13
#r "nuget: Linq.Expression.Optimizer, 1.0.13"
#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 Linq.Expression.Optimizer as a Cake Addin
#addin nuget:?package=Linq.Expression.Optimizer&version=1.0.13

// Install Linq.Expression.Optimizer as a Cake Tool
#tool nuget:?package=Linq.Expression.Optimizer&version=1.0.13

Issue Stats Issue Stats


Lightweight optimizer of System.Linq.Expression expressions. Just basic boolean algebra and reductions, constant and tuple/anonymous type eliminations. For side-effect free Expressions. No compilation-subjective optimizations. This is meant to be used with expressions that are not compiled but transferred to other domain.

Supported frameworks: Net 3.5, Net 4.5-... (and Mono), .NET Standard 1.6 (so also .NET Core)

Supported optimizations

Example as a quote. There are various other cases also.

  • Replace constants comparisons: 3 < 4 -> true
  • Remove anonymous types: new AnonymousObject(Item1 = x, Item2 = "").Item1 --> x
  • Cut not used condition: if false then x else y -> y
  • Remove not: not(false) -> true
  • Binary tree balancing: a or (b or (c or (d or (e or (f or (g or h)))))) -> ((a or b) or (c or d)) or ((e or f) or (g or h))
  • Captured closure constant ("free variable") evaluation: y = 3 and (y + x) -> (3 + x)
  • Execute simple math: 5 * 3 -> 15
  • Boolean algebra reductions:
    • gather (x or y) and (x or z) -> x or (y and z)
    • identity false or y -> y
    • annihilate true or x -> true
    • absorb x and (x or y) -> x
    • idempotence y or y -> y
    • complement x and not(x) -> false
    • doubleNegation not(not(y)) -> y
    • deMorgan not(x) and not(y) -> not(x or y)


This is a side-track from SQLProvider, excelent tool that is kind of OR-mapper with auto-generated objects, so it compiles any databases to .NET-language, and works fast on design time in Visual Studio or other editors.

But I needed better SQL-queries. So this optimses .NET LINQ-expressions. These expressions were not ment to be compiled so Nessos LinqOptimizer was not the right tool. I thought that .NET would optimize these automatically, but no.

Read the Getting started tutorial to learn more.



If you want more optimizations, please feel free to send PRs!

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp1.0 netcoreapp1.1 netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard1.6 netstandard2.0 netstandard2.1
.NET Framework net35 net40 net403 net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48 net481
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen30 tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

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XSpecification is an implementation of Specification pattern for Linq and Elasticsearch

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LINQKit is a free set of extensions for LINQ to SQL and Entity Framework power users.
Version Downloads Last updated
1.0.15 118 3/7/2023
1.0.13 148,421 5/27/2019
1.0.12 31,857 8/31/2018
1.0.11 26,420 1/1/2018
1.0.10 866 1/1/2018
1.0.9 23,290 6/5/2017
1.0.8 1,025 5/10/2017
1.0.7 28,317 10/7/2016
1.0.6 890 10/6/2016
1.0.5 851 10/5/2016
1.0.4 1,026 10/3/2016
1.0.3 1,050 8/30/2016
1.0.2 872 8/30/2016
1.0.1 833 8/30/2016
1.0.0 908 8/27/2016

Look inside a WhereSelectEnumerableIterator, #9