FastGenericNew 3.1.0-preview1

This is a prerelease version of FastGenericNew.
dotnet add package FastGenericNew --version 3.1.0-preview1
NuGet\Install-Package FastGenericNew -Version 3.1.0-preview1
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="FastGenericNew" Version="3.1.0-preview1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FastGenericNew --version 3.1.0-preview1
#r "nuget: FastGenericNew, 3.1.0-preview1"
#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 FastGenericNew as a Cake Addin
#addin nuget:?package=FastGenericNew&version=3.1.0-preview1&prerelease

// Install FastGenericNew as a Cake Tool
#tool nuget:?package=FastGenericNew&version=3.1.0-preview1&prerelease

FastGenericNew V3 Tests alternate text is missing from this package README image alternate text is missing from this package README image

The ultimate fast alternative to Activator.CreateInstance<T> / new T()


  • The best CreateInstance ever

    • Up to 50x faster than Activator.CreateInstance<T>
    • Generic Parameters Support
    • Zero boxing/unboxing
    • TryGetValue-like TryFastNew API
    • Link Mode PublishTrimmed Support
    • Non-Public Constructor Support
    • No Generic Constraints
    • Compatible with .NET Standard 2.0
  • Modern Compiler Integration

    • Source Generator v2 (Incremental Generator)
    • Highly Configurable (Props)
    • Multi-threaded Generation
  • Lastest C# Features Support


You should only use one of them

Pre-Compiled Version

dotnet add package FastGenericNew --version 3.1.0-preview1
  <PackageReference Include="FastGenericNew" Version="3.1.0-preview1" />

SourceGenerator Version

dotnet add package FastGenericNew.SourceGenerator --version 3.1.0-preview1
  <PackageReference Include="FastGenericNew.SourceGenerator" Version="3.1.0-preview1" />

.NET Standard 2.0 & C# 8.0 or above is required for SourceGenerator version


using FastGenericNew;

var obj = FastNew.CreateInstance<T>();

// With parameter(s)
var obj2 = FastNew.CreateInstance<T, string>("text");
var obj3 = FastNew.CreateInstance<T, string, int>("text", 0);

// Try
if (FastNew.TryCreateInstance<T, string>("arg0", out T result));
    // ...


With .NET Framework, Activator.CreateInstance<T>() invokes the parameterless constructor of ValueType if
the constraint is where T : new() but appears to ignore the parameterless constructor if the constraint is where T : struct.
But FastNew.CreateInstance<T>() will always invoke the parameterless constructor if it's available.

If you don't want to invoke the parameterless constructor of ValueType.
Consider to use FastNew.NewOrDefault<T>() which will never invoke the parameterless constructor of ValueType



BenchmarkDotNet=v0.13.1, OS=Windows 10.0.22000
AMD Ryzen 9 3900X, 1 CPU, 24 logical and 12 physical cores
.NET SDK=6.0.200-preview.22055.15
  [Host]             : .NET 6.0.2 (, X64 RyuJIT
  .NET 5.0           : .NET 5.0.14 (5.0.1422.5710), X64 RyuJIT
  .NET 6.0           : .NET 6.0.2 (, X64 RyuJIT
  .NET Framework 4.8 : .NET Framework 4.8 (4.8.4470.0), X64 RyuJIT

Reference Types

Benchmark Result of Reference Types

Value Types

Benchmark Result of Value Types


FastGenericNew is licensed under the MIT license.

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 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 is compatible.  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

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
3.1.0-preview1 7,465 3/18/2022
3.0.0-preview2.1 126 3/12/2022
3.0.0-preview2 124 3/6/2022
3.0.0-preview1 115 3/5/2022