GraphQL.Client

A GraphQL Client for .NET Standard over HTTP.

Provides the following packages:

Package	Downloads	Nuget Latest
GraphQL.Client
GraphQL.Client.Abstractions
GraphQL.Client.Abstractions.Websocket
GraphQL.Client.LocalExecution
GraphQL.Client.Serializer.Newtonsoft
GraphQL.Client.Serializer.SystemTextJson
GraphQL.Primitives

Specification:

The Library will try to follow the following standards and documents:

• GraphQL Specification
• GraphQL HomePage

Usage:

Create a GraphQLHttpClient

// To use NewtonsoftJsonSerializer, add a reference to NuGet package GraphQL.Client.Serializer.Newtonsoft
var graphQLClient = new GraphQLHttpClient("https://api.example.com/graphql", new NewtonsoftJsonSerializer());

Create a GraphQLRequest:

Simple Request:

var heroRequest = new GraphQLRequest {
    Query = @"
    {
        hero {
            name
        }
    }"
};

OperationName and Variables Request:

var personAndFilmsRequest = new GraphQLRequest {
    Query =@"
    query PersonAndFilms($id: ID) {
        person(id: $id) {
            name
            filmConnection {
                films {
                    title
                }
            }
        }
    }",
    OperationName = "PersonAndFilms",
    Variables = new {
        id = "cGVvcGxlOjE="
    }
};

Be careful when using byte[] in your variables object, as most JSON serializers will treat that as binary data! If you really need to send a list of bytes with a byte[] as a source, then convert it to a List<byte> first, which will tell the serializer to output a list of numbers instead of a base64-encoded string.

Execute Query/Mutation:

public class ResponseType 
{
    public PersonType Person { get; set; }
}

public class PersonType 
{
    public string Name { get; set; }
    public FilmConnectionType FilmConnection { get; set; }    
}

public class FilmConnectionType {
    public List<FilmContentType> Films { get; set; }    
}

public class FilmContentType {
    public string Title { get; set; }
}

var graphQLResponse = await graphQLClient.SendQueryAsync<ResponseType>(personAndFilmsRequest);

var personName = graphQLResponse.Data.Person.Name;

Using the extension method for anonymously typed responses (namespace GraphQL.Client.Abstractions) you could achieve the same result with the following code:

var graphQLResponse = await graphQLClient.SendQueryAsync(personAndFilmsRequest, () => new { person = new PersonType()} );
var personName = graphQLResponse.Data.person.Name;

Use Subscriptions

public class UserJoinedSubscriptionResult {
    public ChatUser UserJoined { get; set; }

    public class ChatUser {
        public string DisplayName { get; set; }
        public string Id { get; set; }
    }
}

Create subscription

var userJoinedRequest = new GraphQLRequest {
    Query = @"
    subscription {
        userJoined{
            displayName
            id
        }
    }"
};

IObservable<GraphQLResponse<UserJoinedSubscriptionResult>> subscriptionStream 
    = client.CreateSubscriptionStream<UserJoinedSubscriptionResult>(userJoinedRequest);

var subscription = subscriptionStream.Subscribe(response => 
    {
        Console.WriteLine($"user '{response.Data.UserJoined.DisplayName}' joined")
    });

End Subscription

subscription.Dispose();

Useful Links:

• StarWars Example Server (GitHub)

• StarWars Example Server (EndPoint)

• GitHub GraphQL API Docs

• GitHub GraphQL Explorer

• GitHub GraphQL Endpoint

Blazor WebAssembly Limitations

Blazor WebAssembly differs from other platforms as it does not support all features of other .NET runtime implementations. For instance, the following WebSocket options properties are not supported and will not be set:

• ClientCertificates
• UseDefaultCredentials