public Mutation(IWishListService wishListService) { Name = "Mutation"; Field <IntGraphType>( "addToList", arguments: new QueryArguments( new QueryArgument <NonNullGraphType <ListItemInputType> > { Name = "listItem" }, new QueryArgument <NonNullGraphType <StringGraphType> > { Name = "shopperId" }, new QueryArgument <StringGraphType> { Name = "name" }, new QueryArgument <BooleanGraphType> { Name = "public" } ), resolve: context => { var listItem = context.GetArgument <ListItem>("listItem"); string shopperId = context.GetArgument <string>("shopperId"); string listName = context.GetArgument <string>("name"); bool isPublic = context.GetArgument <bool>("public"); return(wishListService.SaveItem(listItem, shopperId, listName, isPublic)); }); Field <BooleanGraphType>( "removeFromList", arguments: new QueryArguments( new QueryArgument <NonNullGraphType <IdGraphType> > { Name = "id" }, new QueryArgument <NonNullGraphType <StringGraphType> > { Name = "shopperId" }, new QueryArgument <StringGraphType> { Name = "name" } ), resolve: context => { int id = context.GetArgument <int>("id"); string shopperId = context.GetArgument <string>("shopperId"); string listName = context.GetArgument <string>("name"); return(wishListService.RemoveItem(id, shopperId, listName)); }); }