Unhandled exception. System.InvalidOperationException: no implementation of "GraphQL.Client.Abstractions.Websocket.IGraphQLWebsocketJsonSerializer" found

[pysiak]

Crazy! Before the weekend this:
GraphQLHttpClient gql = new GraphQLHttpClient(_config["API:Endpoint"]);
worked for me. Now I'm getting this:

Unhandled exception. System.InvalidOperationException: no implementation of "GraphQL.Client.Abstractions.Websocket.IGraphQLWebsocketJsonSerializer" found
   at GraphQL.Client.Abstractions.GraphQLJsonSerializerExtensions.EnsureAssigned[TSerializerInterface](TSerializerInterface jsonSerializer)
   at GraphQL.Client.Http.GraphQLHttpClient..ctor(GraphQLHttpClientOptions options, HttpClient httpClient)
   at GraphQL.Client.Http.GraphQLHttpClient..ctor(GraphQLHttpClientOptions options)
   at GraphQL.Client.Http.GraphQLHttpClient..ctor(Action`1 configure)
   at GraphQL.Client.Http.GraphQLHttpClient..ctor(Uri endPoint)
   at GraphQL.Client.Http.GraphQLHttpClient..ctor(String endPoint)
   at ConsoleApp1.Program.GetCourses() in C:\...
   at ConsoleApp1.Program.Main(String[] args) in C:\...
   at ConsoleApp1.Program.<Main>(String[] args)

I tried: restoring packages, uninstalling and installing. Any ideas?

[rose-a]

Ran into this myself, will be fixed in next release (292e7c6)...

In the meantime please configure the JSON serializer manually, i.e.

GraphQLHttpClient gql = new GraphQLHttpClient(o => {
    o.EndPoint = _config["API:Endpoint"];
    o.JsonSerializer = new NewtonsoftJsonSerializer();
});

The problem is the way I tried to discover a serializer if none is configured explicitly... so if you have got loads of statements like above it's sufficient to just "mention" NewtonsoftJsonSerializer anywhere, so it can be found via Reflection...

[pysiak]

Thanks, your fix worked. I just realized the last thing I did on Friday was to upgrade from 2.0.0 to 2.1.0.
This seems to break the previous invocation.

[rose-a]

I just realized the last thing I did on Friday was to upgrade from 2.0.0 to 2.1.0.
This seems to break the previous invocation.

Yep, the serializers were moved to separate packages in 2.1.0, I tried to implement a fallback, which is obviously borked at the moment 😉

[pysiak]

I see. I'll stick with 2.1.0 as I'm good now, thanks!

[clintmasden]

Ran into this today. Thanks for the 2.1 fix @rose-a.

[rose-a]

fixed in v2.1.2

[JensMeire]

Installed the 3.0.0 today and i encountered this issue

[rose-a]

the exception says no implementation of "GraphQL.Client.Abstractions.Websocket.IGraphQLWebsocketJsonSerializer" found, so please provide the one you prefer out of the two ones available at the moment!

citing the Release V3.0.0:

BREAKING CHANGE: Remove instanciating a default IGraphQLWebsocketSerializer if none has been provided

Which constructor are you using?

[JensMeire]

Oh, ok, my bad.
Didn't read the notes (fresh install), thought the bug could crawled back into the new release :)

[rose-a]

I guess the exception message should be reworded...

How did you even get there without receiving a compilation error, there is no constructor anymore which does not require an IGraphQLWebsocketJsonSerializer as a parameter....

[DZFLUX]

For those coming here from google searches, working on a new project using something along the lines of
var graphQLClient = new GraphQLHttpClient("https://api.example.com/graphql", new NewtonsoftJsonSerializer());

Ensure

1. nuget reference to GraphQL.Client.Serializer.Newtonsoft
2. using GraphQL.Client.Serializer.Newtonsoft;