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AutoInvoke.Generator by Patrick Kranz

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Name: AutoInvoke.Generator

A generator that invokes a specified Metohd for ever Type in your Project that sattisfis a defined constraint

Author: Patrick Kranz


You can find more details at

Source :

Original Readme


NuGet GitHub license


This Generator let you anotate an Parameterless Generic Method with exactly one TypeArgument.

It will then generate a method with the same name and no type arguments that calls your anotated method for every (non static) Type decleared in your project, that satisfies the type constraints.


Assume you have the following Interface:

internal interface IFileLoder {
public abstract static IFileLoder Init(string path);
public abstract static string FileExtension { get; }

This describes a File loader for different types in our project.

And following implementation:

internal class AudioLoader : IFileLoder {
public static string FileExtension => ".mp3";

public static IFileLoder Init(string Path) {
return new AudioLoader(path);
// the rest of the code...

Which defines how we want to load mp3 files.

We now want to automaticly get a list of all IFileLoader so we know what files we can handle, and we do not want to manualy handel such a list.

An Implementation could look like this:

internal delegate IFileLoder LoadFile(string path);
internal partial class FileHandler {
private readonly Dictionary<string, LoadFile> loaders = new();

public FileHandler() {

public void LoadFile(string file) {
if (loaders.TryGetValue(Path.GetExtension(file), out var loaderFactory)) {
var loader = loaderFactory(file);
// use loader to do things

public void LoadLoaders<T>() where T : IFileLoder {
this.loaders.Add(T.FileExtension, T.Init);

The field loaders will have all extensions our code can handle, and has to every extension the corresponding Init-Method.

The Generated code will look like this:

partial class FileHandler {
private void LoadLoaders() {

Featurs and limitations

  • You can control wich type of types shold get called. E.g. by default no calls are generated for abstract classes or types defined in referenced Assemblys. But you can overide this setting
  • The anotated method can be static
  • If the anotated method has parameters the generated method has the same parametrs
  • If the return type is not void the generated methods returntype is an array of the return type of the attributed method


  • When using multiple Type Parameters, one Type Parameter must contain all others (transitiv) like Foo<T1, T2, T3>() where T1: IComparable<T2> where T2 : IComparable<T3>
  • You can't call static Types. Generics do not allow this.



Finding all implementation of an interface/class and invoke them.

How to use

Example ( source csproj, source files )

This is the CSharp Project that references AutoInvoke.Generator

<Project Sdk="Microsoft.NET.Sdk">


<PackageReference Include="AutoInvoke.Generator" Version="0.0.9">
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>


Generated Files

Those are taken from $(BaseIntermediateOutputPath)\GX

// <auto-generated/>
#nullable enable

namespace AutoInvoke;
[System.AttributeUsage(System.AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
internal sealed class FindAndInvokeAttribute : System.Attribute
#pragma warning disable CS0169 // Remove unused parameter

#pragma warning disable IDE0060 // Remove unused parameter

#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

public FindAndInvokeAttribute()

public FindAndInvokeAttribute(string pattern)

public bool ScanExternalAssamblies { get; set; }
public string MethodName { get; set; }
public bool CallForAbstractClasses { get; set; }
public bool CallForInterfaces { get; set; }
public bool CallForStructs { get; set; }
public bool CallForClasses { get; set; }
public bool CallForRecords { get; set; }
#pragma warning restore CS0169 // Remove unused parameter

#pragma warning restore IDE0060 // Remove unused parameter

#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.



Download Example (.NET C# )

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