In the project, I tried to create a simple implementation for the whole Graphql in .Net7

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Defined GraphQL:

GraphQL is an open-source, flexible query language (“QL” stands for query language) for APIs, as well as a runtime for query execution on existing data

Used the following nuget package

Install GraphQL.

Install GraphQL.Server.Transports.AspNetCore

Install GraphQL.Server.Ui.Playground(UI to work with GraphQL and do tests)

Install GraphQL.SystemTextJson

The following items have been implemented in this project

Implement Query(Base and Read Data)

Mutation

Test and Call

Tech Specification:

Net7

EF7

Graphql(Fetch Data,Mutations)

Xunit(IntegrationTests)

In this section, a sample code for the implementation of reading data (the complete code is available in the project)

Creating GraphQL Specific Objects (Type, Query, Schema)

a) Declaring Type used to describe the kind of item that may be retrieved through your API.

 public class PersonType : ObjectGraphType<Person>
 {
    public PersonType()
    {
    Field(x => x.ID, type: typeof(IdGraphType)).Description("ID");
    Field(x => x.FirstName).Description("FirstName.");
    Field(x => x.LastName).Description("LastName.");
    Field(x => x.Email).Description("Email.");

    }
 }

b) Declaring Query (fetch the data)

public class PersonQuery : ObjectGraphType
{
   public PersonQuery(IUnitOfWork repository)
   {
   Field<ListGraphType<PersonType>>(
   "Persons",
   resolve: context => repository.Person.GetAll()
   );

    }
}

c) Declaring Schema

schema Include :Query(fetch the data) ,Mutations(Add/Edit/Delete),Subscriptions

public class Graphql_ExampleSchema : Schema
{
    public Graphql_ExampleSchema(IServiceProvider provider)
    : base(provider)
    {
    Query = provider.GetRequiredService<PersonQuery>(); 
    }
}