Struggling to get this to work. Code doesn't compile

[NickAyesha]

Hi all,

I’ve been trying to get started with CSnakes but running into roadblocks. I downloaded the repo and first tried to compile the SimpleSample project, then the WebApp project in the Simple folder. Neither will compile in Visual Studio 2022 targeting .NET 8.

I also tried setting up CSnakes.SourceGeneration, but it doesn’t seem to be generating any extension methods (e.g., the expected extension method is missing).

Has anyone else run into this, or could point me in the right direction? I’d really appreciate any help getting this up and running.

Thanks!

[tonybaloney]

The most common reason for this that any Python files are missing the "Additional File" tag in the csproj:

https://tonybaloney.github.io/CSnakes/v1.2.1/getting-started/first-example/#step-2-configure-the-project-file

[NickAyesha]

Thanks for replying, Tony. I had to clear the NuGet cache and restore the packages, which took a while to figure out. After that, I closed and reopened VS 2022, and I was finally able to compile the project—it runs! My next task is to replicate what I see in the sample in my actual .NET 9 project. Wish me luck!

[NickAyesha]

@tonybaloney Can you help me with this issue? It seems like the analyzer isn’t running to process the Python scripts and generate the extension methods. The methods don’t show up in IntelliSense, and when I compile the C# project that references the CSProj containing the scripts, I get the following error: 'IPythonEnvironment' does not contain a definition for 'ObjectProcessor' and no accessible extension method 'ObjectProcessor' accepting a first argument of type 'IPythonEnvironment' could be found (are you missing a using directive or an assembly reference?) . 'ObjectProcessor' is the file name of the python script.
Thank you

[tonybaloney]

Did you check the link I mentioned about the Additional Files? You need to do that for every Python file you want it to analyse. If you can share snippets for C# and the Python code, or the structure that would help

[NickAyesha]

I initially thought I only needed to add the Python files that are directly called from C#, but now I realize I probably need to include all of my .py files as additional files. That might be why things were breaking down.

On my Python CsProj file I have the following configuration:

<PropertyGroup>
	<TargetFramework>net9.0</TargetFramework>
	<ImplicitUsings>enable</ImplicitUsings>
	<Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
	<PackageReference Include="CSnakes.Runtime" Version="1.2.1" />
</ItemGroup>

<ItemGroup>
	<None Remove="ObjectProcessor.py" />
</ItemGroup>

<ItemGroup>
	<AdditionalFiles Include="ObjectProcessor.py">
		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
	</AdditionalFiles>
</ItemGroup>

<ItemGroup>
	<PackageReference Include="CSnakes.Runtime" Version="1.*" />
</ItemGroup>

[tonybaloney]

You have the nuget package reference twice, I don't know how nuget would handle that, but to be safe remove one of them. Also CSnakes will handle the naming from a snake-case filename that Python uses to a C#-friendly one. So I'd rename your file object_processor.py and it'll generate a class ObjectProcessor anyway.

You can use a wildcard for the AdditionalFiles tag:

<PropertyGroup>
	<TargetFramework>net9.0</TargetFramework>
	<ImplicitUsings>enable</ImplicitUsings>
	<Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
	<PackageReference Include="CSnakes.Runtime" Version="1.2.1" />
</ItemGroup>

<ItemGroup>
	<AdditionalFiles Include="*.py">
		<CopyToOutputDirectory>Always</CopyToOutputDirectory>
	</AdditionalFiles>
</ItemGroup>

[NickAyesha]

I'll do that now. Thank you!

[NickAyesha]

Hi,
Here's a quick update:
I've finally got the build to work! I was away doing some other work, but started working on the project last night and again today. It compiles, sees my python CSPROJ project and python files. I'm really relieved. Thanks for your help.