泛型/JSON JavaScriptSerializer C#

Posted 2023-02-19

【中文标题】泛型/JSON JavaScriptSerializer C#

【英文标题】：Generics / JSON JavaScriptSerializer C#

【发布时间】：2010-09-23 04:13:41

【问题描述】：

我正在使用 VS2008Express 在 NET3.5SP1 中构建一个 winForms 应用程序。我正在尝试使用 System.Web.Script.Serialization 库反序列化对象。

错误是：类型'jsonWinForm.Category'不支持数组的反序列化。

干杯！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Web;
using System.Net;
using System.IO;
using System.Web.Script.Serialization;

namespace jsonWinForm 
    public class Category
    
        public int categoryid;
        public string name;
        public int serverimageid;
        public DateTime dateuploaded;
        public bool enabled;
    

    public partial class Form1 : Form
    
        public Form1()
        
            InitializeComponent();
        

        private void button1_Click(object sender, EventArgs e)
        
            using (WebClient client = new WebClient())
            
                //manipulate request headers (optional)
                client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
                string targetUri = "http://www.davemateer.com/ig/genius/category.php";

                //execute request and read response as string to console
                using (StreamReader reader = new StreamReader(client.OpenRead(targetUri)))
                
                    string s = reader.ReadToEnd();
                    textBox1.Text = s;

                    Category cat = new Category();
                    javascriptSerializer serializer = new JavaScriptSerializer();

                    // this fails with a 
                    //Type 'jsonWinForm.Category' is not supported for deserialization of an array.
                    serializer.Deserialize<Category>(s);
                
            
        
    

【参考方案1】：

我发现我的错误..应该是：

干杯

JavaScriptSerializer serializer = new JavaScriptSerializer();

// create a generic list of categories
List<Category> listOfCategories = new List<Category>();

// deserialize as a list of Categories, and put into listOfCategories
listOfCategories = serializer.Deserialize<List<Category>>(s);

//iterate through list and display in text box
foreach (Category item in listOfCategories)

    textBox2.Text += item.categoryid.ToString() + "\r\n";
    textBox2.Text += item.name.ToString() + "\r\n";
    textBox2.Text += item.serverimageid.ToString() + "\r\n";
    textBox2.Text += item.dateuploaded.ToString() + "\r\n";
    textBox2.Text += item.enabled.ToString() + "\r\n";

【讨论】：

如果你要用Deserialize的返回结果替换它，你不需要将listOfCategories初始化为一个新的List()。

【参考方案2】：

很高兴您发现了错误。如果您正在寻找另一种用于 JSON 序列化的工具，您可能想尝试JSON.Net。