.net 在gridview中查看json数据

使用flatter和.NETAPI，我需要创建一些类似下图的东西

这是控制器代码

public List<Category> GetCategories()
    {
        List<Category> categories = (from x in db.Categories select x).ToList();
        return categories;
    }

这就是我在《颤栗》中要做的

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
class myHome extends StatefulWidget {
  @override
  _myHomeState createState() => _myHomeState();
}

class _myHomeState extends State<myHome> {
    Future GetCategories() async {
    var url = Uri.parse("http://192.168.1.8:90/api/values/GetCategories");
    var response = await http.get(url);
    var responsebody = jsonDecode(response.body);
    return responsebody;
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder(future:GetCategories() ,
     builder:(BuildContext context ,AsyncSnapshot snapshot){
       return GridView.builder(gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3)
     ,itemBuilder: ,)}
      ),
      
    );
  }
}

导入“包装：颤振/材料.省道”；
导入“dart:convert”；
将“package:http/http.dart”导入为http；
类myHome扩展了StatefulWidget{
@凌驾
_myHomeState createState（）=>\u myHomeState（）；
}
类myHomeState扩展状态{
Future GetCategories（）异步{
var url=Uri.parse（“http://192.168.1.8:90/api/values/GetCategories");
var response=wait http.get（url）；
var responsebody=jsonDecode（response.body）；
返回响应体；
}
@凌驾
小部件构建（构建上下文）{
返回脚手架(
正文：FutureBuilder（future:GetCategories（），
生成器：（BuildContext上下文，异步快照）{
返回GridView.builder（gridDelegate:SliverGridDelegateWithFixedCrossAxisCount（crossAxisCount:3）
，itemBuilder:，）}
),
);
}
}

我的问题是如何在gridview中查看json结果

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
class myHome extends StatefulWidget {
  @override
  _myHomeState createState() => _myHomeState();
}

class _myHomeState extends State<myHome> {
    Future GetCategories() async {
    var url = Uri.parse("http://192.168.1.8:90/api/values/GetCategories");
    var response = await http.get(url);
    var responsebody = jsonDecode(response.body);
    return responsebody;
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder(future:GetCategories() ,
     builder:(BuildContext context ,AsyncSnapshot snapshot){
       return GridView.builder(gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3)
     ,itemBuilder: ,)}
      ),
      
    );
  }
}