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。

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

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);
    }

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

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

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.