解析JSON到C＃的Windows Phone 8

Question

正在此異常：

類型的異常 'System.Reflection.TargetInvocationException' 發生在System.ni.dll但在用戶代碼中沒有處理

我的代碼：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Navigation; 
using Microsoft.Phone.Controls; 
using Microsoft.Phone.Shell; 
using trialss.Resources; 
using System.IO; 
using Newtonsoft.Json; 

namespace trialss 
{ 
public class Token 
{ 
    public string Token_No { get; set; } 
    public string Transaction_Date { get; set; } 
    public string Transaction_Amount { get; set; } 
    public string Purchased_Units { get; set; } 
} 

public class RootObject 
{ 
    public List<Token> Token { get; set; } 
    public int success { get; set; } 
} 

public partial class MainPage : PhoneApplicationPage 
{ 
    // Constructor 
    public MainPage() 
    { 
     InitializeComponent(); 

     // Sample code to localize the ApplicationBar 
     //BuildLocalizedApplicationBar(); 
    } 

    private void clikeed(object sender, RoutedEventArgs e) 
    { 
     WebClient webClient = new WebClient(); 
     webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted); 
     webClient.DownloadStringAsync(new Uri("my link")); 

    } 
    void webClient_DownloadStringCompleted(object sender,   DownloadStringCompletedEventArgs e) 
    { 
     var rootObject = JsonConvert.DeserializeObject<RootObject>(e.Result); 

     foreach (var book in rootObject.Token) 
     { 

     } 

    } 
} 
} 

我怎樣才能解決這個問題？

Answer 1

你爲什麼不嘗試使用Windows.Data.Json？我用HttpClient下載Stream。然後我使用一些具有上述名稱空間的類（取決於需求）解析它。