Fields

Let's look at the following query:

{
  hero {
    name
    # Queries can have comments!
    friends {
      name
    }
  }
}

The expected result looks as follows:

{
  "data": {
    "hero": {
      "name": "R2-D2",
      "friends": [
        {
          "name": "Luke Skywalker"
        },
        {
          "name": "Han Solo"
        },
        {
          "name": "Leia Organa"
        }
      ]
    }
  }
}

Assuming we have the following data models:

 class Context
{
    public Character Hero { get; set; }
}

class Character
{
    public string Name { get; set; }
    public IEnumerable<Character> Friends { get; set; }
}

... and the following data:

var context = new Context
  {
      Hero = new Character
      {
          Name = "R2-D2",
          Friends = new List<Character>
              {
                  new Character {
                    Name = "Luke Skywalker"
                  },
                  new Character {
                    Name = "Han Solo"
                  },
                  new Character {
                    Name = "Leia Organa"
                  }
              }
      }
  };

The GraphQL.Net schema definition could look like this:

 var schema = GraphQL<Context>.CreateDefaultSchema(() => context);
schema.AddType<Character>().AddAllFields();
schema.AddField("hero", c => c.Hero);

schema.Complete();

var gql = new GraphQL<Context>(schema);

Let's run the query:

 var queryResult = gql.ExecuteQuery(
    @"{
        hero {
            name,
            friends {
                name
            }
        }
      }"
    );

See examples/01-simple-query/ for the code.

Note on list fields and AddAllFields

AddAllFields does not support list fields of type array, they have to be of type IEnumerable. If we define the property Character.Friends as:

public Character[] Friends { get; set; }

We will get the following Exception on execution gql.ExecuteQuery:

GraphQL.Parser.ValidationException : Unsupported CLR type ``Character''