How to pack method parameters

[georghinkel]

I am trying to create an LSP server in C#. I have come across the LspTypes package that defines all the types of LSP 3.16. Slightly strange that there is no more up to date package for this, but that's a side note, I suppose (suggestions welcome).

Now the issue is, when I define for instance the Initialize method as InitializeResult Initialize(InitializeParams @params), I get an error saying that the client provided eight arguments while the method can only accept a single. How can I specify that the parameter denotes the entire request and the library should instead bundle all of the eight parameters into a single InitializeParams?

I tried setting UseSingleObjectParameterDeserialization = true but it does not seem to work, I still get the error message that the method only accepts a single argument but 8 were provided.

I am using StreamJsonRPC version 2.19.27.

[AArnott]

Good question.

The initial problem comes of the fact that LSP isn't actually JSON-RPC. JSON-RPC would mandate that the form of requests LSP uses actually be interpreted as 8 individual parameters rather than as one object. It's a shame, because LSP could have been designed as a proper JSON-RPC use by simply adding [ ] around the JSON object it currently sets to the params property. But oh well...

Your attempt to use UseSingleObjectParameterDeserialization = true on the RPC method should have worked. We added that to StreamJsonRpc specifically to allow for the LSP variant of JSON-RPC. Are you sure your method takes exactly 1 parameter (plus an optional CancellationToken parameter)? If it takes any more than that, the attribute property will be ignored.