microsoft/TypeAgent

# .NET 8.0 Upgrade Report

## Project target framework modifications

| Project name      | Old Target Framework | New Target Framework | Commits                                              |
|:------------------|:--------------------:|:--------------------:|:-----------------------------------------------------|
| autoShell.csproj  | net48                | net8.0-windows       | 8535806a, 872e2361, 1a5fd106, 68cf297b, 6265eccb     |

## NuGet Packages

| Package Name                        | Old Version | New Version | Commit Id   |
|:------------------------------------|:-----------:|:-----------:|:------------|
| AudioSwitcher.AudioApi              | 3.0.0       | (removed)   | 872e2361    |
| AudioSwitcher.AudioApi.CoreAudio    | 3.0.3       | (removed)   | 872e2361    |
| Newtonsoft.Json                     | 13.0.3      | 13.0.4      | 872e2361    |

## All commits

| Commit ID   | Description                                                                                      |
|:------------|:-------------------------------------------------------------------------------------------------|
| 86a0cbb2    | Commit upgrade plan                                                                              |
| 8535806a    | Migrate autoShell project to SDK-style and .NET 8                                                |
| 872e2361    | Update dependencies in autoShell.csproj                                                          |
| 1a5fd106    | Removed AudioSwitcher.AudioApi.CoreAudio using directive                                         |
| 68cf297b    | Re-add AudioSwitcher.AudioApi.CoreAudio using directive with GetDefaultDevice method             |
| c178dfa4    | Remove misplaced using directive and fully qualify AudioSwitcher types                           |
| 188289ae    | Comment out AudioSwitcher code with instructions to restore                                      |
| 6265eccb    | Store final changes for step 'Upgrade autoShell.csproj'                                          |

## Project feature upgrades

### autoShell.csproj

Here is what changed for the project during upgrade:

- **Project format conversion**: Converted from legacy .NET Framework 4.8 project format to modern SDK-style project
- **Target framework update**: Changed from `net48` to `net8.0-windows`
- **AudioSwitcher API replacement**: Replaced incompatible AudioSwitcher.AudioApi and AudioSwitcher.AudioApi.CoreAudio packages with Windows Core Audio COM interop implementation
  - Added new file `CoreAudioInterop.cs` with COM interface definitions for `IMMDeviceEnumerator`, `IMMDevice`, and `IAudioEndpointVolume`
  - Refactored `SetMasterVolume`, `RestoreMasterVolume`, and `SetMasterMute` methods to use native Windows Core Audio API
- **Assembly references cleanup**: Removed legacy assembly references that are now implicit in SDK-style projects (System, System.Core, System.Data, etc.)
- **Package update**: Updated Newtonsoft.Json from 13.0.3 to 13.0.4

## Next steps

- Test the audio volume control functionality to ensure the Windows Core Audio COM interop implementation works as expected
- Consider adding error handling for edge cases in audio device enumeration