CoreCLR-NCalc.Unity 2.2.0

.NET Standard 1.3 .NET Framework 4.5
NuGet\Install-Package CoreCLR-NCalc.Unity -Version 2.2.0
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.
dotnet add package CoreCLR-NCalc.Unity --version 2.2.0
<PackageReference Include="CoreCLR-NCalc.Unity" Version="2.2.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add CoreCLR-NCalc.Unity --version 2.2.0
#r "nuget: CoreCLR-NCalc.Unity, 2.2.0"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install CoreCLR-NCalc.Unity as a Cake Addin
#addin nuget:?package=CoreCLR-NCalc.Unity&version=2.2.0

// Install CoreCLR-NCalc.Unity as a Cake Tool
#tool nuget:?package=CoreCLR-NCalc.Unity&version=2.2.0


Build status NuGet NuGet

⚠️ This repository is currently only passively maintained. If there are fully fledged PRs, I will occasional merge those in and publish new versions. If you would like to become a maintainer and work on some of the open issues, please reply here

A clone of NCalc from with the following changes:

  • added support for CoreCLR (.NET Standard 1.3+)
  • embedded portable version of Antlr (no extra library/dependency required)
  • added compilation of expressions to actual CLR lambdas


Simply install the package via NuGet

PM> Install-Package CoreCLR-NCalc

Creating Lambdas

Simple Expressions

var expr = new Expression("1 + 2");
Func<int> f = expr.ToLambda<int>();
Console.WriteLine(f()); // will print 3

Expressions with Functions and Parameters

class ExpressionContext
  public int Param1 { get; set; }
  public string Param2 { get; set; }
  public int Foo(int a, int b)
    return a + b;

var expr = new Expression("Foo([Param1], 2) = 4 && [Param2] = 'test'");
Func<ExpressionContext, bool> f = expr.ToLambda<ExpressionContext, bool>();

var context = new ExpressionContext { Param1 = 2, Param2 = "test" };
Console.WriteLine(f(context)); // will print True

Performance Comparison

The measurements were done during CI runs on AppVeyor and fluctuate a lot in between runs, but the speedup is consistently in the thousands of percent range. The speedup measured on actual hardware was even higher (between 10,000% and 35,000%).

Formula Description Expression Evaluations / sec Lambda Evaluations / sec Speedup
(4 * 12 / 7) + ((9 * 2) % 8) Simple Arithmetics 474,247.87 32,691,490.41 6,793.33%
5 * 2 = 2 * 5 && (1 / 3.0) * 3 = 1 Simple Arithmetics 276,226.31 93,222,709.05 33,648.67%
[Param1] * 7 + [Param2] Constant Values 707,493.27 21,766,101.47 2,976.51%
[Param1] * 7 + [Param2] Dynamic Values 582,832.10 21,400,445.13 3,571.80%
Foo([Param1] * 7, [Param2]) Dynamic Values and Function Call 594,259.69 17,209,334.34 2,795.93%
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
.NET Core netcoreapp1.0 netcoreapp1.1 netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard1.3 netstandard1.4 netstandard1.5 netstandard1.6 netstandard2.0 netstandard2.1
.NET Framework net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen30 tizen40 tizen60
Universal Windows Platform uap uap10.0
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.

NuGet packages

This package is not used by any NuGet packages.

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Version Downloads Last updated
2.2.0 95 7/6/2022