{ pkgs ? import <nixpkgs> {} }:

pkgs.symlinkJoin {
  name = "dotnet-pack";
  paths = [ pkgs.dotnet-sdk_8 pkgs.dotnet-sdk_7 pkgs.dotnet-sdk ];
  postBuild = ''
    rm -rfv $out/bin
    rm -rfv $out/dotnet
    cp -rv ${pkgs.dotnet-sdk_8}/dotnet $out/
    cp -rv ${pkgs.dotnet-sdk_8}/bin $out/
  '';
}

wanted to share this derivation incase anyone ever needed to use multiple dotnet versions at once

[Rory@Rory-desktop:/Rory-Open-Architecture]$ dotnet --list-sdks
6.0.414 [/nix/store/g0j4gcarcbqkxl3i14h4ls3qsmyjdc2m-dotnet-pack/sdk]
7.0.401 [/nix/store/g0j4gcarcbqkxl3i14h4ls3qsmyjdc2m-dotnet-pack/sdk]
8.0.100-rc.1.23455.8 [/nix/store/g0j4gcarcbqkxl3i14h4ls3qsmyjdc2m-dotnet-pack/sdk]

Unhandled exception: System.ComponentModel.Win32Exception (2): An error occurred trying to start process '/home/Rory/git/DotnetManifestsToNix/DotnetManifestsToNix/bin/Debug/net7.0/DotnetManifestsToNix' with working directory '/home/Rory/git/DotnetManifestsToNix/DotnetManifestsToNix'. No such file or directory

i wonder what causes this when using dotnet run

Converting workload microsoft.net.workload.mono.toolchain version 6.0.5
Workload wasm-tools description .NET WebAssembly build tools
Workload wasm-tools pack Microsoft.NET.Runtime.WebAssembly.Sdk
Workload wasm-tools pack Microsoft.NETCore.App.Runtime.Mono.browser-wasm
Workload wasm-tools pack Microsoft.NETCore.App.Runtime.AOT.Cross.browser-wasm
Workload wasm-tools extend microsoft-net-runtime-mono-tooling
Workload wasm-tools extend microsoft-net-sdk-emscripten
Workload wasm-tools platform win-x64
Workload wasm-tools platform linux-x64
Workload wasm-tools platform osx-x64
Workload wasm-tools platform osx-arm64
Workload microsoft-net-runtime-android description Android Mono Runtime