JanusGraph Load an existing graph with Gremlin.Net and Docker-Compose

Question

I'm currently working with janusgraph and gremlin via a docker-compose:

version: "3.9"

services:
  janusgraph:
    image: docker.io/janusgraph/janusgraph:latest
    container_name: jce-janusgraph
    environment:
      JANUS_PROPS_TEMPLATE: cql-es
      janusgraph.storage.hostname: jce-cassandra
      janusgraph.index.search.hostname: jce-elastic
    ports:
      - "8182:8182"
    networks:
      - jce-network
    volumes:
      - ./mydata:/opt/janusgraph/mydata
    healthcheck:
      test: ["CMD", "bin/gremlin.sh", "-e", "scripts/remote-connect.groovy"]
      interval: 10s
      timeout: 30s
      retries: 3

  cassandra:
    image: cassandra:3
    container_name: jce-cassandra
    ports:
      - "9042:9042"
      - "9160:9160"
    networks:
      - jce-network

  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.6.0
    container_name: jce-elastic
    environment:
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - "http.host=0.0.0.0"
      - "network.host=0.0.0.0"
      - "transport.host=127.0.0.1"
      - "cluster.name=docker-cluster"
      - "xpack.security.enabled=false"
      - "discovery.zen.minimum_master_nodes=1"
    ports:
      - "9200:9200"
    networks:
      - jce-network

networks:
  jce-network:
volumes:
  janusgraph-default-data:

Inside /mydata I have a graphml that I'd like to load in order to using it in my .net 6 web api. In gremlin console I'm able to load that graph. I searched online but I have not found anything on how to load a graph with Gremlin.Net.

I was thinking to create a Seed class with a static method that load the graph and then call in Program

Edit

I create Seed.cs:

public static class Seed
    {
        public static void LoadGraph(GraphTraversalSource g)
        {

           //g.Io<Graph>("C:\\Users\\ext-azanetti\\Desktop\\janusgraph\\mydata\\air-routes.graphml");
           g.Io<Graph>("http://jce-janusgraph:8182/opt/janusgraph/mydata/air-routes.graphml");

        }
    }

Then i call seed in my Program.cs:

...
builder.Services.AddSingleton<GremlinClient>((serviceProvider) =>
{
    var gremlinServer = new GremlinServer(
        hostname: "localhost",
        port: 8182,
        enableSsl: false,
        username: null,
        password: null
        );

    var connectionPoolSettings = new ConnectionPoolSettings
    {
        MaxInProcessPerConnection = 32,
        PoolSize = 4,
        ReconnectionAttempts = 4,
        ReconnectionBaseDelay = TimeSpan.FromSeconds(1),
    };

    return new GremlinClient(
        gremlinServer: gremlinServer,
        messageSerializer: new GraphSON3MessageSerializer(new GraphSON3Reader(), new GraphSON3Writer()),
        connectionPoolSettings: connectionPoolSettings
        );
});

builder.Services.AddSingleton<GraphTraversalSource>((serviceProvider) =>
{
    GremlinClient gremlinClient = serviceProvider.GetService<GremlinClient>();
    var driverRemoteConnection = new DriverRemoteConnection(gremlinClient, "g");
    return AnonymousTraversalSource.Traversal().WithRemote(driverRemoteConnection);
});
...
try
{
    var g = app.Services.GetService<GraphTraversalSource>();
    if (g != null) Seed.LoadGraph(g);
    else throw new Exception("Cannot get service GraphTraversalSource to load data");
}
catch (Exception ex)
{
    throw new Exception("Fail to load the graph", ex);
}
...

It doesn't work. And it doesn't throw any execption.

Update

I delete the Seed.cs and in put all inside Program.cs:

builder.Services.AddSingleton<GremlinClient>((serviceProvider) =>
{
    var gremlinServer = new GremlinServer(
        hostname: "localhost",
        port: 8182,
        enableSsl: false,
        username: null,
        password: null
        );

    var connectionPoolSettings = new ConnectionPoolSettings
    {
        MaxInProcessPerConnection = 32,
        PoolSize = 4,
        ReconnectionAttempts = 4,
        ReconnectionBaseDelay = TimeSpan.FromSeconds(1),
    };

    return new GremlinClient(
        gremlinServer: gremlinServer,
        messageSerializer: new GraphSON3MessageSerializer(new GraphSON3Reader(), new GraphSON3Writer()),
        connectionPoolSettings: connectionPoolSettings
        );
});

builder.Services.AddSingleton<GraphTraversalSource>((serviceProvider) =>
{
    GremlinClient gremlinClient = serviceProvider.GetService<GremlinClient>();
    var driverRemoteConnection = new DriverRemoteConnection(gremlinClient, "g");
    var g = AnonymousTraversalSource
            .Traversal()
            .WithRemote(driverRemoteConnection);
    
    // ##### CODE ADDED IN UPDATE ######
    g.Io<Graph>("/opt/janusgraph/mydata/air-routes.graphml")
        .With(IO.reader, IO.graphml);
    return g;
});

Now it's throw InvalidRequestArguments: The traversal source [g] for alias [g] is not configured on the server. Now I'm trying to figure out how to solve this exception.