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如何解码c#中的json响应？

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

错误是:类型'jsonWinForm.Category'不支持反序列化数组.

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) …