AlastairLundy.DotPrimitives.Collections 3.3.0

Prefix Reserved
.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. 
dotnet add package AlastairLundy.DotPrimitives.Collections --version 3.3.0
                    


                    

                
NuGet\Install-Package AlastairLundy.DotPrimitives.Collections -Version 3.3.0
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="AlastairLundy.DotPrimitives.Collections" Version="3.3.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="AlastairLundy.DotPrimitives.Collections" Version="3.3.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="AlastairLundy.DotPrimitives.Collections" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add AlastairLundy.DotPrimitives.Collections --version 3.3.0
                    


                    

                
#r "nuget: AlastairLundy.DotPrimitives.Collections, 3.3.0"
#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. 
#:package AlastairLundy.DotPrimitives.Collections@3.3.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=AlastairLundy.DotPrimitives.Collections&version=3.3.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=AlastairLundy.DotPrimitives.Collections&version=3.3.0
                    


                            Install as a Cake Tool

DotPrimitives.Collections

A collection primitives/utilities library for .NET.

Supported TFMs: .NET Standard 2.0, .NET Standard 2.1, .NET 8.0, .NET 9.0

Features

  • CachedEnumerable
    Caches an IEnumerable's values for inexpensive re-use when required.

  • RefreshableCachedEnumerable
    Like CachedEnumerable, but allows cache invalidation, along with the ability to update the cache.

  • GroupEnumerable<TKey, TElement>
    Deferred grouping of a sequence by key without intermediate collections

Getting Started

Install via NuGet:

dotnet add package AlastairLundy.DotPrimitives.Collections

Usage Examples

using AlastairLundy.DotPrimitives.Collections.Groupings;
using AlastairLundy.DotPrimitives.Collections.HashMaps;
using AlastairLundy.DotPrimitives.Collections.CachedEnumerables;


// CachedEnumerable
var source = Enumerable.Range(1, 5);
var cached = new CachedEnumerable<int>(source);
foreach (var x in cached) Console.WriteLine(x);  // Source is enumerated once
foreach (var x in cached) Console.WriteLine(x);  // Call the cached results without enumerating the IEnumerable again!

// RefreshableCachedEnumerable
var refreshable = new RefreshableCachedEnumerable<int>(source);

source = source.Select(x => x + 1);
// Refresh the cache when the IEnumerable<T> contents changes.
refreshable.RefreshCache(source);

// Then call the cached results whilst avoiding multiple enumeration!
foreach (var x in refreshable) Console.WriteLine(x);

// GroupByEnumerable
var items = new[] { ("a", 1), ("b", 2), ("a", 3) };
var groups = new GroupEnumerable<string, (string, int)>(
    items, item => item.Item1, item => item.Item2
);
foreach (var group in groups)
{
    Console.WriteLine($"Key: {group.Key}");
    foreach (var value in group) Console.WriteLine($"  {value}");
}

License

This project is licensed under the Mozilla Public License 2.0.
See the LICENSE text for more details.

Acknowledgements

Thanks to the following projects for their great work:

  • Polyfill for simplifying .NET Standard 2.0 support
  • Microsoft's Microsoft.Bcl.HashCode for providing a backport of the HashCode class and static methods to .NET Standard 2.0
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  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 was computed.  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.  net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-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)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (3)

Showing the top 3 NuGet packages that depend on AlastairLundy.DotPrimitives.Collections:

Package Downloads
AlastairLundy.EnhancedLinq.MsExtensions

LINQ style Deferred and Immediate enumeration mode extension methods for StringSegments and potentially other Microsoft.Extension.* packages in the future .
AlastairLundy.EnhancedLinq.Memory

LINQ style Immediate enumeration mode extension methods for Spans and Memory.
AlastairLundy.EnhancedLinq

Additional LINQ style Deferred and Immediate enumeration mode extension methods for .NET .

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
3.3.0 339 9/15/2025
3.2.0 461 8/29/2025
3.1.0 321 8/18/2025
3.0.0 227 7/26/2025
2.1.0 657 7/19/2025
2.0.0 432 7/5/2025

## Changes since 3.2.0

## 🚀 Features

- Add ``AsGrouping`` and ``AsGroupingCollection`` extension methods to DotPrimitives.Collections @alastairlundy (#35)
- Add ``CustomEnumeratorEnumerable`` to DotPrimitives.Collections @alastairlundy (#34)