BidirectionalDictionary 1.3.0

dotnet add package BidirectionalDictionary --version 1.3.0
NuGet\Install-Package BidirectionalDictionary -Version 1.3.0
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="BidirectionalDictionary" Version="1.3.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add BidirectionalDictionary --version 1.3.0
#r "nuget: BidirectionalDictionary, 1.3.0"
#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.
// Install BidirectionalDictionary as a Cake Addin
#addin nuget:?package=BidirectionalDictionary&version=1.3.0

// Install BidirectionalDictionary as a Cake Tool
#tool nuget:?package=BidirectionalDictionary&version=1.3.0

NuGet Downloads License


Proper implementation of a bidirectional dictionary, also known as "BiMap" or "Two-way dictionary", for .NET Standard 2.0.

Example of usage

using System.Collections.Generic;

var countryCapitalDictionary = new BidirectionalDictionary<string, string>()
    ["Italy"] = "Rome",
    ["India"] = "New Delhi",
    ["USA"]   = "Washington, D.C.",

Console.Write(countryCapitalDictionary["Italy"]); // "Rome"
Console.Write(countryCapitalDictionary.Inverse["Rome"]); // "Italy"

Read-only support

If you need an read-only version of the bidirectional dictionary, the library provides an easy way to achieve this.

Use for BidirectionalDictionary:

var readOnlyDictionary = dictionary.AsReadOnly();

Use IBidirectionalDictionary:

using System.Collections.ObjectModel;

var readOnlyDictionary = new ReadOnlyBidirectionalDictionary<string, string>(dictionary);


This library provides the following interfaces for greater flexibility:

  • IBidirectionalDictionary
  • IReadOnlyBidirectionalDictionary

Both BidirectionalDictionary and ReadOnlyBidirectionalDictionary implement these interfaces, making it easier for you to work with various levels of abstractions.


The library is licensed under the MIT license.

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 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 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 is compatible. 
.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.
  • .NETStandard 2.0

    • No dependencies.
  • .NETStandard 2.1

    • No dependencies.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on BidirectionalDictionary:

Package Downloads

A Windows TaskDialog wrapper that also supports navigation and hyperlinks.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
1.3.0 1,357 8/11/2023
1.2.0 542 3/17/2023
1.1.1 579 8/27/2022
1.1.0 398 8/26/2022
1.0.1 359 8/24/2022
1.0.0 365 8/24/2022