Gapotchenko.FX.Collections 2022.2.7

The ID prefix of this package has been reserved for one of the owners of this package by Prefix Reserved
dotnet add package Gapotchenko.FX.Collections --version 2022.2.7
NuGet\Install-Package Gapotchenko.FX.Collections -Version 2022.2.7
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="Gapotchenko.FX.Collections" Version="2022.2.7" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Gapotchenko.FX.Collections --version 2022.2.7
#r "nuget: Gapotchenko.FX.Collections, 2022.2.7"
#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 Gapotchenko.FX.Collections as a Cake Addin
#addin nuget:?package=Gapotchenko.FX.Collections&version=2022.2.7

// Install Gapotchenko.FX.Collections as a Cake Tool
#tool nuget:?package=Gapotchenko.FX.Collections&version=2022.2.7


The module was started by borrowing an implementation of ConcurrentHashSet<T> from Mr. Bar Arnon.

Other than that, the module provides polyfills for missing functionality in .NET.


ConcurrentHashSet<T> provided by Gapotchenko.FX.Collections is a thread-safe implementation of HashSet<T>.

AssociativeArray<TKey, TValue>

AssociativeArray<TKey, TValue> provided by Gapotchenko.FX.Collections is a drop-in replacement for Dictionary<TKey, TValue> that can handle null keys.

In contrast, stock Dictionary<TKey, TValue> cannot work with null keys and throws an exception whenever a null key is encountered. Due to such an artificial narrowing of the key space, it becomes hardly possible to solve some kinds of tasks with Dictionary<TKey, TValue>.

AssociativeArray<TKey, TValue> resolves that by supporting a full space of keys without opinionated exclusions.

AddRange<T>(IEnumerable<T>) for Collections

AddRange is a highly demanded operation that allows to add a sequence of elements to the end of a collection. Like this:

using Gapotchenko.FX.Collections.Generic;

var collection = new Collection<int>();
collection.AddRange(numbers.Where(x => x % 2 == 0)); // add even numbers

IsNullOrEmpty() for Containers

System.String class provides a convenient IsNullOrEmpty primitive.

Gapotchenko.FX.Collections extends availability of that primitive by providing IsNullOrEmpty() extension method for other container types. Here is an example:

using Gapotchenko.FX.Collections.Generic;

class Method
    List<Argument> m_Arguments;

    public bool HasArguments => !m_Arguments.IsNullOrEmpty();


The use of an extension method for a null check may look controversial at first, but since the method starts with IsNull… prefix, it immediately communicates its purpose and function. Other benefits include automatic type inference and semantic locality.


KeyValuePair Polyfill

.NET provides a versatile KeyValuePair<TKey, TValue> struct and suggests a default way for its instantiation:

new KeyValuePair<TKey, TValue>(key, value)

Which is, well, not handy as it often comes to this:

new KeyValuePair<BindingManagerDataErrorEventHandler, ICom2PropertyPageDisplayService>(key, value)

Gapotchenko.FX.Collections provides a better way to instantiate a KeyValuePair<TKey, TValue> struct:

using Gapotchenko.FX.Collections.Generic;

KeyValuePair.Create(key, value)

It leverages the automatic type inference provided by some .NET languages like C#.

PriorityQueue polyfill

PriorityQueue<TElement, TPriority> provided by Gapotchenko.FX.Collections module is an implementation of the prioritized queue introduced since .NET 6. The polyfill makes it available to all supported .NET versions.


Gapotchenko.FX.Collections module comes with a function for KeyValuePair<TKey, TValue> deconstruction, so you can write this:

using Gapotchenko.FX.Collections.Generic;

void ProcessMap(IDictionary<string, int> map)
    foreach (var (key, value) in map)

instead of a more verbose variant:

void ProcessMap(IDictionary<string, int> map)
    foreach (var i in map)
        var key = i.Key;
        var value = i.Value;

A little detail, but sometimes it matters a lot when you are amid the heat of the code.

Commonly Used Types

  • Gapotchenko.FX.Collections.Concurrent.ConcurrentHashSet
  • Gapotchenko.FX.Collections.Generic.AssociativeArray

Other Modules

Let's continue with a look at some other modules provided by Gapotchenko.FX:

Or look at the full list of modules.

Product Compatible and additional computed target framework versions.
.NET net5.0 is compatible.  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 was computed.  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 is compatible.  netcoreapp2.1 is compatible.  netcoreapp2.2 was computed.  netcoreapp3.0 is compatible.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net46 is compatible.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 is compatible.  net472 is compatible.  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)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (4)

Showing the top 4 NuGet packages that depend on Gapotchenko.FX.Collections:

Package Downloads
Gapotchenko.FX.Profiles.Core The ID prefix of this package has been reserved for one of the owners of this package by

Represents the Core profile of Gapotchenko.FX.

Gapotchenko.FX.Math.Geometry The ID prefix of this package has been reserved for one of the owners of this package by

The module provides primitives and operations for geometry math.

Gapotchenko.FX.Math.Combinatorics The ID prefix of this package has been reserved for one of the owners of this package by

The module provides the math operations for combinatorics.

Gapotchenko.FX.Math.Topology The ID prefix of this package has been reserved for one of the owners of this package by

The module provides data structures and primitives for working with abstract topologies.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
2022.2.7 1,569 5/1/2022
2022.2.5 1,404 5/1/2022
2022.1.4 1,420 4/6/2022
2021.2.21 1,491 1/21/2022
2021.2.20 1,447 1/17/2022
2021.1.5 753 7/6/2021
2020.2.2-beta 350 11/21/2020
2020.1.15 683 11/5/2020
2020.1.9-beta 446 7/14/2020
2020.1.8-beta 439 7/14/2020
2020.1.7-beta 467 7/14/2020
2020.1.1-beta 502 2/11/2020
2019.3.7 757 11/4/2019
2019.2.20 736 8/13/2019
2019.1.151 805 3/30/2019