Existential.Net 3.1.1

dotnet add package Existential.Net --version 3.1.1
NuGet\Install-Package Existential.Net -Version 3.1.1
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="Existential.Net" Version="3.1.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Existential.Net --version 3.1.1
#r "nuget: Existential.Net, 3.1.1"
#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 Existential.Net as a Cake Addin
#addin nuget:?package=Existential.Net&version=3.1.1

// Install Existential.Net as a Cake Tool
#tool nuget:?package=Existential.Net&version=3.1.1

About Existential.NET

Existential is a utility library that contains parameter validation methods, a Maybe monad, and more. Full documentation can be found at existential.ggreig.com.

It can be used to:

It reduces the code you need to write for basic null checks by providing validation techniques or - even better - using the Maybe<T> monad can just help you not to care!

Other classes in Existential help you to avoid constantly reinventing the wheel for common problems such as writing text to multiple outputs, converting an IEnumerable to an IEnumerable<T>, getting the name of the current method or negating a Predicate.

These solutions aren't innovative in themselves - plenty code examples exist out there - but Existential brings them together into one tested library so you don't have to.

To get started:


Azure DevOps Status:

Azure DevOps builds (branch) Azure DevOps releases


SonarCloud Status:

Reliability Rating Maintainability Rating Security Rating

Lines of Code Coverage


Publication Status:

Documentation site Nuget


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.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-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 was computed. 
.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)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
3.1.1 424 12/21/2023
3.1.0 93 12/21/2023
3.0.0 265 3/24/2023
2.0.0 1,416 4/21/2022
1.4.0 420 4/5/2022
1.3.1 342 11/12/2021
1.3.0 399 10/8/2021
1.2.1 1,852 3/15/2021
1.2.0 323 3/14/2021
1.1.0 494 11/29/2020
1.0.0 3,449 10/26/2020
0.0.0-alpha.0.230 270 10/23/2020
0.0.0-alpha.0.229 181 10/22/2020
0.0.0-alpha.0.219 252 10/14/2020
0.0.0-alpha.0.184 199 10/12/2020

## In this version (3.1.1):
- Minor but high profile formatting fix to package ReadMe.

## In previous version (3.1.0):

**New features:**
- Added support for .Net 8.0
- By default, if exception filter logging fails, a `Trace` message (at `Error` level) will be created instead.
- Added `MultiTextWriter`, a `TextWriter` implementation that can write the same string to multiple outputs.
- Added `IWriteStrategy`, an interface consumed by `MultiTextWriter`.
- Added extension methods for IEnumerable to safely use a non-generic IEnumerator:
 - `UsingNonGenericEnumerator(this IEnumerable, Action<IEnumerator>)`
 - `UsingNonGenericEnumerator<TResult>(this IEnumerable, Func<IEnumerator, TResult>)`

**Other Improvements:**
- Documentation improvements:
 - API documentation reviewed and improved
 - Added "exceptions thrown" to documentation throughout
 - Updated to DocFX "modern" template
- Migrated test mocks from Moq to NSubstitute

**Deprecated:**
- Marked redundant method as **obsolete**. Will be removed in a future version.
 - `TypeExtension.IsInstanceOfType<T>(this T, Type)` - prefer the C# `is` operator
- Removed the deprecated serialisation constructor from ArgumentTypeException for .Net 8.0:
 - `ArgumentTypeException(SerializationInfo,StreamingContext)`

Fuller history of changes at https://existential.ggreig.com/articles/version_history.html