VSCode-insiders no longer loads the solution when a folder is opened.

[mcNets]

When a solution folder is opened the solution is no longer loaded.

That's the Platform Uno output:

[Info] Launching XAML language server c:\Users\mcnets\.vscode-insiders\extensions\unoplatform.vscode-0.18.5\bin\lshost\net9.0\Uno.LSP.Host.dll
[Info] Found 'ms-dotnettools.csharp' version 2.58.20.
[Info] Found 'ms-dotnettools.csdevkit' version 1.14.12.
[Info] C# extension onServerStateChange API is available.
[Info] Running in Dev Kit mode
[Info] Uno Platform "dotnet new" templates are already installed. The templates may be updated by running "dotnet new install Uno.Templates"

And that's the error that appears in the C# Dev kit output:

Starting Spawn .NET server...
Starting opening a solution...
Starting processing the solution file "c:\Work\OsmoConsole\OsmoConsole.sln" in Dev Kit server...
Using preinstalled .NET runtime at "C:\Program Files\dotnet\dotnet.exe" to load Dev Kit processes.
Found installed dotnet location "C:\Program Files\dotnet\dotnet.exe" to load projects.
Project system hosting process will use runtime installed in SDK.
.NET server started and IPC established in 878ms
Completed Spawn .NET server (1203ms)
Failed at 'processing the solution file "c:\Work\OsmoConsole\OsmoConsole.sln" in Dev Kit server' (1747ms) with error: Error: An item with the same key has already been added. Key: 02ea681e-c7d8-13c7-8484-4ac65e1b71e8
Failed at 'opening a solution' (1750ms) with error: SolutionOpenError: Run into errors while opening the solution: Error: An item with the same key has already been added. Key: 02ea681e-c7d8-13c7-8484-4ac65e1b71e8
Failed to open solution SolutionOpenError: Run into errors while opening the solution: Error: An item with the same key has already been added. Key: 02ea681e-c7d8-13c7-8484-4ac65e1b71e8

[jeromelaban]

Thanks for the report. Is it VS Code that does this, or an update in csharp devkit? If you rollback C# devkit, does it still fail?

[spouliot]

You might also want to try to downgrade the C# extension - as the C# features are split between the two MS extensions.

If that does not work try opening a different .sln to see if it works.

If it does then try opening your (failing) .sln inside the editor and check if the errors are true.

If the GUID 02ea681e-c7d8-13c7-8484-4ac65e1b71e8 is used for multiple items then it's an invalid solution. It could be that something else went wrong with some tool (merge?) that write to the .sln file and this only got detected later when you opened that solution inside VS Code.

[jeromelaban]

Update: We're not able to reproduce on our end.

[mcNets]

@jeromelaban @spouliot
It seems this guid belongs to the Tests folder in the solution. Deleting it did the job. This solution has been generated as a new 'Uno platform project' using Visual Studio and I have changed nothing.

Tanks for your help.

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.13.35507.96 d17.13
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OsmoConsole", "OsmoConsole\OsmoConsole.csproj", "{278A700A-4E1B-4101-A903-E4128DA4C01F}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{02EA681E-C7D8-13C7-8484-4AC65E1B71E8}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OsmoConsole.Tests", "OsmoConsole.Tests\OsmoConsole.Tests.csproj", "{1062F5E2-31F3-6025-9211-79BDEE60C9D0}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{02EA681E-C7D8-13C7-8484-4AC65E1B71E8}"
	ProjectSection(SolutionItems) = preProject
		.gitignore = .gitignore
		Directory.Build.props = Directory.Build.props
		Directory.Build.targets = Directory.Build.targets
		Directory.Packages.props = Directory.Packages.props
		global.json = global.json
	EndProjectSection
EndProject
Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
		Debug|Any CPU = Debug|Any CPU
		Release|Any CPU = Release|Any CPU
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
		{278A700A-4E1B-4101-A903-E4128DA4C01F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{278A700A-4E1B-4101-A903-E4128DA4C01F}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{278A700A-4E1B-4101-A903-E4128DA4C01F}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
		{278A700A-4E1B-4101-A903-E4128DA4C01F}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{278A700A-4E1B-4101-A903-E4128DA4C01F}.Release|Any CPU.Build.0 = Release|Any CPU
		{278A700A-4E1B-4101-A903-E4128DA4C01F}.Release|Any CPU.Deploy.0 = Release|Any CPU
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0}.Release|Any CPU.Build.0 = Release|Any CPU
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0}.Release|Any CPU.Deploy.0 = Release|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
		HideSolutionNode = FALSE
	EndGlobalSection
	GlobalSection(NestedProjects) = preSolution
		{1062F5E2-31F3-6025-9211-79BDEE60C9D0} = {02EA681E-C7D8-13C7-8484-4AC65E1B71E8}
	EndGlobalSection
	GlobalSection(ExtensibilityGlobals) = postSolution
		SolutionGuid = {75D0CE91-32E7-4EBC-A66E-8FF18D509EED}
	EndGlobalSection
EndGlobal