LINQ to GraphQL - Strongly typed GraphQL queries with LINQ query syntax.
You must regenerate your client code with GraphQLinq.Scaffolding after updating GraphQLinq.Client to a newer version
This library is not maintained any more. For a similar LINQ style GraphQL syntax library check out ZeroQL
GraphQLinq is a .NET tool for generating C# classes from a GraphQL endpoint and a .Net Standard library for writing strongly typed GraphQL queries with LINQ.
With GraphQLinq you will:
- Write strongly typed queries with LINQ.
- Have your queries checked by the compiler.
- Run queries and deserialize JSON response into strongly typed classes in a single method call.
- View queries generated by LINQ to GraphQL.
Before you starting writing queries, you need to generate classes from GraphQL types. This is done by GraphQLinq.Scaffolding, a .NET tool that is part of this project.
To get the tool, open your favourite command shell and run
dotnet tool install --global --version 1.1.0-beta GraphQLinq.ScaffoldingRunning this command will install the GraphQLinq.Scaffolding tool and make it available globally for all projects.
Next, navigate to the project where you want to add the classes and scaffold the client code. In this example, I will use the SpaceX GraphQL Api so run the following command:
graphqlinq-scaffold https://api.spacex.land/graphql -o SpaceX -n SpaceXThe o option specifies the output directory for generated classes, and n specifies the namespace of the classes.
Before writing the queries, you need to install the LINQ to GraphQL client library from NuGet. Run the following command to install it in the current project:
dotnet add package GraphQLinq.Client --version 1.1.0-betaThe scaffolding tool generates classes for types available in the GraphQL type system and a QueryContext class that serves as an entry point for running the queries. GraphQLinq supports running different kinds of queries.
To query all properties of a type, simply run a query like this:
var spaceXContext = new QueryContext();
var company = await spaceXContext.Company().ToItem();
RenderCompanyDetails(company);This will query all primitive and string properties of Company, but it won't query nested properties or collection type properties. Here is the output of the code snippet:
┌───────────┬──────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Property │ Value │
├───────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Name │ SpaceX │
│ Ceo │ Elon Musk │
│ Summary │ SpaceX designs, manufactures and launches advanced rockets and spacecraft. The company was founded in │
│ │ 2002 to revolutionize space technology, with the ultimate goal of enabling people to live on other │
│ │ planets. │
│ Founded │ 2002 │
│ Founder │ Elon Musk │
│ Employees │ 7000 │
└───────────┴──────────────────────────────────────────────────────────────────────────────────────────────────────────┘If you want to query specific properties, including a navigation property, you can specify it with the Select method. You either map the projection to an existing type or an anonymous object (Headquarters is a nested property):
var companySummaryAnonymous = await spaceXContext.Company().Select(c => new { c.Ceo, c.Name, c.Headquarters }).ToItem();
//Use data class to select specific properties
var companySummary = await spaceXContext.Company().Select(c => new CompanySummary
{
Ceo = c.Ceo,
Name = c.Name,
Headquarters = c.Headquarters
}).ToItem();
RenderCompanySummary(companySummary);This will result in the following output:
┌──────────────┬─────────────────┐
│ Property │ Value │
├──────────────┼─────────────────┤
│ Name │ SpaceX │
│ Ceo │ Elon Musk │
│ Headquarters │ ┌─────────────┐ │
│ │ │ California │ │
│ │ │ Hawthorne │ │
│ │ │ Rocket Road │ │
│ │ └─────────────┘ │
└──────────────┴─────────────────┘You can also query navigation properties using the Include method. You can include several properties if you need, and you can also Include nested navigation properties:
var companyWithHeadquartersAndLinks = await spaceXContext.Company()
.Include(info => info.Headquarters)
.Include(info => info.Links).ToItem();
RenderCompanyDetailsAndLinks(companyWithHeadquartersAndLinks);If the query has parameters, the generated method will have a parameter for each query parameter.
This code will query for all Missions that included Orbital ATK as a manufacturer. It also builds a new query over the existing one that
includes Payloads in the result.
var missionsQuery = spaceXContext.Missions(new MissionsFind { Manufacturer = "Orbital ATK" }, null, null)
.Include(mission => mission.Manufacturers);
var missions = await missionsQuery.ToEnumerable();
RenderMissions(missions);
var missionsWithPayloads = await missionsQuery.Include(mission => mission.Payloads).ToEnumerable();
RenderMissions(missionsWithPayloads, true);The Include method allows quering for multi-level nested properties too. For example, here is how to query for Launches and include Rocket's second stage payload manufacturer:
//Launch_date_unix and Static_fire_date_unix need custom converter
spaceXContext.JsonSerializerOptions.Converters.Add(new UnixEpochDateTimeConverter());
var launches = await spaceXContext.Launches(null, 10, 0, null, null)
.Include(launch => launch.Links)
.Include(launch => launch.Rocket)
.Include(launch => launch.Rocket.Second_stage.Payloads.Select(payload => payload.Manufacturer))
.ToEnumerable();
RenderLaunches(launches);You can view the GraphQL query and variables by using the Query and Variables property of the GraphQuery class. The ToString() method of the GraphQuery class returns the query and the variables combined:
var missionsQuery = spaceXContext.Missions(new MissionsFind { Manufacturer = "Orbital ATK" }, null, null)
.Include(mission => mission.Manufacturers);
var query = missionsQuery.Query;
var fullQuery = missionsQuery.ToString();If you run the above code query will be equal to
query ($find: MissionsFind) { result: missions (find: $find) {
description
id
name
twitter
website
wikipedia
manufacturers
}}and the content of fullQuery will be:
{"query":"query ($find: MissionsFind) { result: missions (find: $find) {
description
id
name
twitter
website
wikipedia
manufacturers
}}","variables":{"find":{"manufacturer":"Orbital ATK"}}}See the open issues for a list of proposed features and known issues.
If you encounter a bug or have a feature request, please use the Issue Tracker. The project is also open to contributions, so feel free to fork the project and open pull requests.
Copyright © Giorgi Dalakishvili
Distributed under the Apache License. See License for more information.
