srigumm/graphql-dotnetcore-example

Building a GraphQL API with .Net Core.

Add package

      dotnet add package HotChocolate
dotnet add package HotChocolate.AspNetCore
dotnet add package HotChocolate.AspNetCore.Playground
(or)
<PackageReference Include="HotChocolate.AspNetCore" Version="0.8.2" />
<PackageReference Include="HotChocolate.AspNetCore.GraphiQL" Version="0.8.2" />
<PackageReference Include="HotChocolate.AspNetCore.Playground" Version="0.8.2" />
<PackageReference Include="HotChocolate.AspNetCore.Authorization" Version="0.8.2" />
<PackageReference Include="HotChocolate.Subscriptions.InMemory" Version="0.8.2" />

Define Schema file. (schema.graphql)

      type Query {
        cards: [CreditCard!]!
        card(Id: ID!): CreditCard
      }

      type CreditCard {
        id: ID!
        name: String!
        IssuedBy: String
      }

Configure middleware

      using HotChocolate;
      using HotChocolate.AspNetCore;
      using HotChocolate.Execution.Configuration;

       // this enables you to use DataLoader in your resolvers.
        services.AddDataLoaderRegistry();

        // Add GraphQL Services
        var queryExecutionOptions = new QueryExecutionOptions
        {
            TracingPreference = TracingPreference.OnDemand
        };

        if (_environment.IsDevelopment())
        {
            queryExecutionOptions.TracingPreference = TracingPreference.Always;
            queryExecutionOptions.IncludeExceptionDetails = true;
            _logger.LogInformation(" *** LogInformation: In DEV Environment");

        }
      // Create our schema
      var schemaDef = File.ReadAllText("schema.graphql");
      var schema = Schema.Create(schemaDef, ConfigureSchema);

      services.AddGraphQL(schema, queryExecutionOptions);



      app.UseGraphQL();
      app.UsePlayground();

Launch playground and test queries

  {
    cards{
      id
      name
    }
    card(Id:2){
      id
      name
    }
  }