Soenneker.Utils.AsyncSingleton 1.0.22

Prefix Reserved
.NET Standard 2.1 This package targets .NET Standard 2.1. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package Soenneker.Utils.AsyncSingleton --version 1.0.22
                    


                    

                
NuGet\Install-Package Soenneker.Utils.AsyncSingleton -Version 1.0.22
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="Soenneker.Utils.AsyncSingleton" Version="1.0.22" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Soenneker.Utils.AsyncSingleton" Version="1.0.22" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Soenneker.Utils.AsyncSingleton" />
                    


                            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 Soenneker.Utils.AsyncSingleton --version 1.0.22
                    


                    

                
#r "nuget: Soenneker.Utils.AsyncSingleton, 1.0.22"
#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 Soenneker.Utils.AsyncSingleton@1.0.22
#: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=Soenneker.Utils.AsyncSingleton&version=1.0.22
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Soenneker.Utils.AsyncSingleton&version=1.0.22
                    


                            Install as a Cake Tool

alternate text is missing from this package README image alternate text is missing from this package README image alternate text is missing from this package README image

alternate text is missing from this package README image Soenneker.Utils.AsyncSingleton

An externally initializing singleton that uses double-check asynchronous locking, with optional async and sync disposal

Installation

Install-Package Soenneker.Utils.AsyncSingleton

Example

The example below is a long-living HttpClient implementation using AsyncSingleton. It avoids the additional overhead of IHttpClientFactory, and doesn't rely on short-lived clients.

public class HttpRequester : IDisposable, IAsyncDisposable
{
    private readonly AsyncSingleton<HttpClient> _client;

    public HttpRequester()
    {
        // This func will lazily execute once it's retrieved the first time.
        // Other threads calling this at the same moment will asynchronously wait,
        // and then utilize the HttpClient that was created from the first caller.
        _client = new AsyncSingleton<HttpClient>(() =>
        {
            var socketsHandler = new SocketsHttpHandler
            {
                PooledConnectionLifetime = TimeSpan.FromMinutes(10),
                MaxConnectionsPerServer = 10
            };

            return new HttpClient(socketsHandler);
        });
    }

    public async ValueTask Get()
    {
        // retrieve the singleton async, thus not blocking the calling thread
        await (await _client.Get()).GetAsync("https://google.com");
    }

    // Disposal is not necessary for AsyncSingleton unless the type used is IDisposable/IAsyncDisposable
    public ValueTask DisposeAsync()
    {
        GC.SuppressFinalize(this);

        return _client.DisposeAsync();
    }

    public void Dispose()
    {
        GC.SuppressFinalize(this);
        
        _client.Dispose();
    }
}
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.  net9.0 was computed.  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 netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.1 is compatible. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen 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.

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GitHub repositories

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Version Downloads Last Updated
4.0.849 1,252 9/16/2026
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1.0.22 22,046 5/30/2023
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