graphql-query-resolver.cs

public class BranchesResolver : IBranchesResolver
{
    private readonly IBranchesService _branchesService;

    public BranchesResolver(IBranchesService branchesService)
    {
        _branchesService = branchesService;
    }

    public void Resolve(GraphQLQuery graphQLQuery)
    {
        graphQLQuery.Field<ResponseGraphType<BranchType>>(
            "branch",
            arguments: new QueryArguments(
                new QueryArgument<NonNullGraphType<StringGraphType>> { Name = "projectId", Description = "id of the project" },
                new QueryArgument<NonNullGraphType<StringGraphType>> { Name = "branchName", Description = "name of the branch" }
            ),
            resolve: context => { 
                var projectId = context.GetArgument<string>("projectId");
                var branchName = context.GetArgument<string>("branchName");
                var branch = _branchesService.GetBranchAsync(projectId, branchName).GetAwaiter().GetResult();

                if(branch == null) 
                {
                    return new Response("NotFound", "Resource not found");
                }

                return new Response(branch);
            }
        );
    }
}