如何从Web服务的JSON数组或对象反序列化？ [英] How to Deserialize from web service JSON array or object?

问题描述

我创建了一个Web服务应用程序的Windows Phone 7，这是来自敬爱URI JSON数组获得。 ...[{"id":4,"name":"Bangalore"},{"id":1,"name":"Chennai"},{"id":3,"name":"Hyderabad"},{"id":2,"name":"Mumbai"}]...

列表项=（名单）ds.ReadObject（msnew）; 在这一行一个错误（它说，同时运行）。 有一个错误在反序列化根级别type.Data的对象是无效的。行1，位置1。

编码：

MainPage的公（）         {             的InitializeComponent（）;         }

  [DataContract]
    公共类项目
    {

        [数据成员]
        公众诠释ID
        {
            得到;
            组;
        }

        [数据成员]
        公共字符串名称
        {
            得到;
            组;
        }
    }
    私人无效PhoneApplicationPage_Loaded（对象发件人，RoutedEventArgs E）
    {
        Web客户端WC =新的Web客户端（）;
        wc.DownloadStringAsync（新的URI（http://75.101.161.83:8080/CityGuide/Cities?authId=CITY4@$pir*$y$t*m$13GUID*5））;
        wc.DownloadStringCompleted + =新DownloadStringCompletedEventHandler（wc_DownloadStringCompleted）;
    }

    无效wc_DownloadStringCompleted（对象发件人，DownloadStringCompletedEventArgs E）
    {
       字符串MyJsonString = e.Result;
      //的MessageBox.show（e.Result）;
       DataContractSerializer的DS =新的DataContractSerializer（typeof运算（项目））;
       MemoryStream的msnew =新的MemoryStream（Encoding.UTF8.GetBytes（MyJsonString））;
       名单＆LT;项目＆GT;项目=（名单＆LT;项目＆GT;）ds.ReadObject（msnew）;
    }
 

解决方案

有在你想要做什么，2失误。

1. 您使用的是的DataContractSerializer 而不是 DataContractJsonSerializer 。你要使用的人期待XML，JSON不是。

2. 您正在试图反序列化到一个项目，然后将其转换为名单，其中;项目＆GT; ，而不是一个数组，这是JSON包含的内容。

试试这个来代替：

 变种DS =新DataContractJsonSerializer（typeof运算（第[]））;
  VAR msnew =新的MemoryStream（Encoding.UTF8.GetBytes（MyJsonString））;
  项目[]项目=（项目[]）ds.ReadObject（msnew）;
 

如果你以后想，你可以在阵列转换到一个列表。

I created one web service application in windows phone 7. this is JSON array get from belowed uri. ...[{"id":4,"name":"Bangalore"},{"id":1,"name":"Chennai"},{"id":3,"name":"Hyderabad"},{"id":2,"name":"Mumbai"}]...

List item = (List)ds.ReadObject(msnew); In this line one bug(it says while run). There was an error deserializing the object of type.Data at the root level is invalid. Line 1, position 1.

coding:

public MainPage() { InitializeComponent(); }

    [DataContract]
    public class Item
    {           

        [DataMember]
        public int id
        {
            get;
            set;
        }

        [DataMember]
        public string name
        {
            get;
            set;
        }
    }
    private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
    {
        WebClient wc = new WebClient();
        wc.DownloadStringAsync(new Uri("http://75.101.161.83:8080/CityGuide/Cities?authId=CITY4@$pir*$y$t*m$13GUID*5"));
        wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
    }

    void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
       string MyJsonString = e.Result;
      // MessageBox.Show(e.Result);
       DataContractSerializer ds = new DataContractSerializer(typeof(Item));
       MemoryStream msnew = new MemoryStream(Encoding.UTF8.GetBytes(MyJsonString));
       List<Item> item = (List<Item>)ds.ReadObject(msnew);
    }

解决方案

There are 2 mistakes in what you're trying to do.

1. You're using DataContractSerializer instead of DataContractJsonSerializer. The one you're trying to use is expecting XML, not JSON.

2. You're trying to deserialize to a single Item and then convert that to a List<Item>, rather than an array, which is what json contains.

Try this instead:

  var ds = new DataContractJsonSerializer(typeof(Item[]));
  var msnew = new MemoryStream(Encoding.UTF8.GetBytes(MyJsonString));
  Item[] items = (Item[])ds.ReadObject(msnew);

If you later wanted to, you could convert the array to a list.

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