C# 将 JSON 文件反序列化为数组

Question

如何在 C# 中将 JSON 反序列化为数组，我想创建具有 JSON 属性的图像。我当前的JSON 文件看起来像这样......

{
  "test":[
    {
      "url":"150.png",
      "width":"300",
      "height":"300"
    },
    {
      "url":"150.png",
      "width":"300",
      "height":"300"
    },
    {
      "url":"150.png",
      "width":"300",
      "height":"300"
    }
  ]
}

我的 Form1 有一个 Picture1，我试图用 Newtonsoft.json 反序列化，但我不知道如何将我的 JSON 对象反序列化为数组。（我是开发初学者）

这是我当前的 Form1 代码

using System;
using System.Windows.Forms;
using System.Collections.Generic;

using System.Globalization;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System.IO;
using System.Linq;
using System.Drawing;

namespace viewer_mvc
{

    public partial class Index : Form
    {
        string url;
        int width, height;

        public Index()
        {
            InitializeComponent();
        }

        private void Index_Load(object sender, EventArgs e)
        {
            /*using (StreamReader file = File.OpenText("ultra_hardcore_secret_file.json"))
            {
                JsonSerializer serializer = new JsonSerializer();
                Elements img = (Elements)serializer.Deserialize(file, typeof(Elements));

                url = "../../Resources/" + img.url;
                width = img.width;
                height = img.height;
            }

            pictureBox1.Image = Image.FromFile(url);
            pictureBox1.Size = new Size(width, height);*/
            var json = File.ReadAllText("ultra_hardcore_secret_file.json");
            RootObject obj = JsonConvert.DeserializeObject<RootObject>(json);

            button1.Text = obj.test.ToString();

        }


        public class Elements
        {
            public string url { get; set; }
            public string width { get; set; }
            public string height { get; set; }
        }
        public class RootObject
        {
            public List<Elements> test { get; set; }
        }
    }
}

Answer 1

你可以尝试JObject和JArray解析JSON文件

using (StreamReader r = new StreamReader(filepath))
{
       string jsonstring = r.ReadToEnd();
       JObject obj = JObject.Parse(jsonstring);
       var jsonArray = JArray.Parse(obj["test"].ToString());

       //to get first value
       Console.WriteLine(jsonArray[0]["url"].ToString());

       //iterate all values in array
       foreach(var jToken in jsonArray)
       {
              Console.WriteLine(jToken["url"].ToString());
       }
}