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

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Nyrest/FastGenericNew

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✨ Features

  • ✔️The bestCreateInstance ever

    • Up to 50x faster thanActivator.CreateInstance<T>
    • Generic Parameters Support
    • Zero boxing/unboxing
    • TryGetValue-like TryFastNew API
    • Link ModePublishTrimmed Support
    • Non-Public Constructor Support
    • No Generic Constraints
    • Compatible with .NET Standard 2.0
    • Multiple backend implementations
    • Heavily tested on Win/Mac/Linux

  • 🪛Modern Compiler Integration

    • Source Generator v2 (Incremental Generator)
    • Highly Configurable (Props)
    • Multi-threaded Generation

  • 🔥Latest C#/.NET Features Support

🔧 Installation

You should only use one of them

Pre-Compiled Version

dotnet add package FastGenericNew--version3.3.1
<ItemGroup>  <PackageReferenceInclude="FastGenericNew"Version="3.3.1" /></ItemGroup>

SourceGenerator Version

dotnet add package FastGenericNew.SourceGenerator--version3.3.1
<ItemGroup>  <PackageReferenceInclude="FastGenericNew.SourceGenerator"Version="3.3.1" /></ItemGroup>

SourceGeneratorV2 requires

.NET Standard 2.0 or above
C# 8.0 or above
Roslyn 4.0.1 or above
Modern IDE(Optional) [VS2022, Rider, VSCode]

📖 Examples

usingFastGenericNew;// Simply replace 'Activator' to 'FastNew'varobj=FastNew.CreateInstance<T>();// With parameter(s)varobj2=FastNew.CreateInstance<T,string>("text");varobj3=FastNew.CreateInstance<T,string,int>("text",0);// Try pattern// NOTE: The try pattern will only check if the constructor can be called.//       It will not catch or handle any exceptions thrown in the constructor.if(FastNew.TryCreateInstance<T,string>("arg0",outTresult));{// ...}

Notes

With .NET Framework,Activator.CreateInstance<T>() invokes the parameterless constructor ofValueType if
the constraint iswhere T : new() but appears toignore the parameterless constructor if the constraint iswhere T : struct.
ButFastNew.CreateInstance<T>() will always invoke the parameterless constructor if it's available.

If you don't want to invoke the parameterless constructor ofValueType,consider usingFastNew.NewOrDefault<T>() whichwill never invoke the parameterless constructor ofValueType

🚀 Benchmark

Check the full benchmark results here:
https://github.com/Nyrest/FastGenericNew/blob/main/benchmark_results.md

Environment

BenchmarkDotNet v0.14.0, Windows 11 (10.0.22631.3958/23H2/2023Update/SunValley3)AMD Ryzen 9 3900X, 1 CPU, 24 logical and 12 physical cores.NET SDK 9.0.100-preview.7.24407.12  [Host]     : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2  Job-GFVMQQ : .NET 5.0.17 (5.0.1722.21314), X64 RyuJIT AVX2  Job-FGYWFO : .NET 6.0.33 (6.0.3324.36610), X64 RyuJIT AVX2  Job-LODQQQ : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2  Job-NXJWMD : .NET 9.0.0 (9.0.24.40507), X64 RyuJIT AVX2  Job-VBBRLS : .NET Framework 4.8.1 (4.8.9256.0), X64 RyuJIT VectorSize=256

Reference Types

Benchmark Result of Reference Types

Value Types

Benchmark Result of Value Types

📜 License

FastGenericNew is licensed under theMIT license.

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