Raiqub.ImplicitGenerics 1.1.0

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dotnet add package Raiqub.ImplicitGenerics --version 1.1.0                
NuGet\Install-Package Raiqub.ImplicitGenerics -Version 1.1.0                
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="Raiqub.ImplicitGenerics" Version="1.1.0" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Raiqub.ImplicitGenerics --version 1.1.0                
#r "nuget: Raiqub.ImplicitGenerics, 1.1.0"                
#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 Raiqub.ImplicitGenerics as a Cake Addin
#addin nuget:?package=Raiqub.ImplicitGenerics&version=1.1.0

// Install Raiqub.ImplicitGenerics as a Cake Tool
#tool nuget:?package=Raiqub.ImplicitGenerics&version=1.1.0                

Implicit Generics

GitHub license Nuget Nuget

Provides a mechanism that allows generic type parameter to be inferred implicitly.

🏃 Quickstart   |   📗 Guide   |   📦 NuGet

<hr />

Sometimes when developing generic methods extensions it needs additional generic parameter types, and when any of types can not be inferred then all generic parameter types must be specified.

This library brings interfaces and factories listed below IOutParam<out T> interface and OutParam class to help developers create method parameters that lets the compiler infer the type of the generic parameter.

  • IOutParam<out T> interface and OutParam factory class for covariant parameters;
  • IInParam<out T> interface and InParam factory class for contravariant parameters;
  • ITypeParam<out T> interface and TypeParam factory class for non-variant parameters;


Raiqub.ImplicitGenerics is currently compatible with the following frameworks:

  • .NET Standard >= 1.0
  • .NET 6.0


  1. Reference the package <br/> Add the package to your project, for example via:

    Install-Package Raiqub.ImplicitGenerics
    dotnet add package Raiqub.ImplicitGenerics
  2. Add using <br/> To use the types provided by this library add using on top of .cs file:

    using Raiqub.ImplicitGenerics

You should now be ready to use the library types on your project.


To understand the scenarios covered by this library, some examples are given.

Registering adapter on the dependency injector

Take an example of a method that registers an adapter:

public static IServiceCollection AddAdapter<TIn, TOut, TAdapter>(
    this IServiceCollection services)
    where TAdapter : class, IAdapter<TIn, TOut> =>
    services.AddSingleton<IAdapter<TIn, TOut>, TAdapter>();

To call this method all three parameters must be specified:

services.AddAdapter<int, float, Int32ToFloatAdapter>()

But, using the type provided by this library:

public static IServiceCollection AddAdapter<TIn, TOut>(
    this IServiceCollection services,
    IOutParam<IAdapter<TIn, TOut>> outParam) =>
    services.AddSingleton(typeof(IAdapter<TIn, TOut>), outParam.Type);

Then the call is just:

using Raiqub.ImplicitGenerics;


Down casting dictionary values

Take another example of a method that down-cast the values of a dictionary:

public static IDictionary<TKey, TOther> DownCastValues<TKey, TValue, TOther>(
    this IDictionary<TKey, TValue> dictionary)
    where TKey : notnull
    where TValue : class
    where TOther : class, TValue =>
        .Select(it => (it.Key, Value: (TOther)it.Value))
        .ToDictionary(it => it.Key, it => it.Value);

And to call this method:

IDictionary<string, string> result = dict.DownCastValues<string, object, string>();

But, using the provided ITypeParam<out T> interface:

public static IDictionary<TKey, TOther> DownCastValues<TKey, TValue, TOther>(
    this IDictionary<TKey, TValue> dictionary,
    ITypeParam<TOther> typeParam)
    where TKey : notnull
    where TValue : class
    where TOther : class, TValue =>
        .Select(it => (it.Key, Value: (TOther)it.Value))
        .ToDictionary(it => it.Key, it => it.Value);

Finally, the call is:

using Raiqub.ImplicitGenerics;

IDictionary<string, string> result = dict.DownCastValues(TypeParam.Of<string>());

More examples

You can find more examples going to the test project: ParamTest.cs.


If something is not working for you or if you think that the source file should change, feel free to create an issue or Pull Request. I will be happy to discuss and potentially integrate your ideas!


See the LICENSE file for details.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  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 netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.0 is compatible.  netstandard1.1 was computed.  netstandard1.2 was computed.  netstandard1.3 was computed.  netstandard1.4 was computed.  netstandard1.5 was computed.  netstandard1.6 was computed.  netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net45 was computed.  net451 was computed.  net452 was computed.  net46 was computed.  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 tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Universal Windows Platform uap was computed.  uap10.0 was computed. 
Windows Phone wp8 was computed.  wp81 was computed.  wpa81 was computed. 
Windows Store netcore was computed.  netcore45 was computed.  netcore451 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

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Version Downloads Last updated
1.1.0 3,368 4/2/2023
1.0.0 1,128 7/26/2022

Add IInParam and ITypeParam