How can I asynchronously parse JSON data from a URL on a Windows phone and display it in a

Question

How can I asynchronously parse JSON data from a URL on a Windows phone and display it in a

As an Android developer exploring the world of Windows Phone for the first time, I came across this resource on how to handle list boxes in Windows Phone 7/8. However, my challenge now is parsing JSON from a URL instead of XML as shown in the example. While the provided code snippet was helpful for working with XML asynchronously in a list box, I am looking to achieve the same functionality but with JSON data.

Below is the portion of code I used to retrieve data from a URL:

private void FlickrSearch_Click(object sender, RoutedEventArgs e)
    { 
      WebClient webclient = new WebClient(); 
      webclient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webclient_DownloadStringCompleted); 
      webclient.DownloadStringAsync(new Uri("http://api.flickr.com/services/feeds/photos_public.gne?tag=" + SearchBox.Text + "&format=rss2")); // Flickr search 
  }

If anyone could provide guidance on handling JSON from a URL in a Windows Phone application, it would be greatly appreciated.

c#javascript json asynchronous windows-phone

Answer 1

Answer №1

It seems like the scope of this question is quite broad for a detailed answer. However, assuming that you have already successfully implemented XML data based on the guidelines provided in the blog post mentioned above, making adjustments to work with JSON should not be too difficult.

Begin by Installing Json.Net from NuGet Package Manager
Examine the JSON format returned by the API by visiting the API search URL in your browser. Make sure to change the format specification to JSON, for instance, . You will notice that the returned JSON string is not valid and may require some manual cleanup to rectify this issue: remove "jsonFlickrFeed(" at the beginning and ")" at the end of the JSON string. After making these adjustments, the string will be ready for deserialization using Json.Net.
The remaining steps should align with the instructions provided in the original blog post

Below is a code snippet illustrating the process of handling JSON data:

using Newtonsoft.Json.Linq;
using Newtonsoft.Json;

void webclient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
{ 
   if (e.Error != null)
    { 
       MessageBox.Show("error");
       return;
    } 

    var jsonString = e.Result;

    //clean up the JSON string to ensure its validity
    jsonString = jsonString.Replace("jsonFlickrFeed(", "");
    jsonString = jsonString.Remove(jsonString.Length - 1);

    //deserialize the JSON string into an object
    var rootObject = JsonConvert.DeserializeObject<JObject>(jsonString);
    var items = (JArray)rootObject["items"];

    //populate a listbox with items extracted from the JSON
    listBox1.ItemsSource = from tweet in items                                     
    select new FlickrData                                   
     { 
       ImageSource = tweet["media"]["m"].ToString(), 
       Message = tweet["description"].ToString(), 
       UserName = tweet["title"].ToString(), 
       PubDate = DateTime.Parse(tweet["published"].ToString())                                    
     };                 
}

Answer 2

It seems like the scope of this question is quite broad for a detailed answer. However, assuming that you have already successfully implemented XML data based on the guidelines provided in the blog post mentioned above, making adjustments to work with JSON should not be too difficult.

Begin by Installing Json.Net from NuGet Package Manager
Examine the JSON format returned by the API by visiting the API search URL in your browser. Make sure to change the format specification to JSON, for instance, . You will notice that the returned JSON string is not valid and may require some manual cleanup to rectify this issue: remove "jsonFlickrFeed(" at the beginning and ")" at the end of the JSON string. After making these adjustments, the string will be ready for deserialization using Json.Net.
The remaining steps should align with the instructions provided in the original blog post

Below is a code snippet illustrating the process of handling JSON data:

using Newtonsoft.Json.Linq;
using Newtonsoft.Json;

void webclient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
{ 
   if (e.Error != null)
    { 
       MessageBox.Show("error");
       return;
    } 

    var jsonString = e.Result;

    //clean up the JSON string to ensure its validity
    jsonString = jsonString.Replace("jsonFlickrFeed(", "");
    jsonString = jsonString.Remove(jsonString.Length - 1);

    //deserialize the JSON string into an object
    var rootObject = JsonConvert.DeserializeObject<JObject>(jsonString);
    var items = (JArray)rootObject["items"];

    //populate a listbox with items extracted from the JSON
    listBox1.ItemsSource = from tweet in items                                     
    select new FlickrData                                   
     { 
       ImageSource = tweet["media"]["m"].ToString(), 
       Message = tweet["description"].ToString(), 
       UserName = tweet["title"].ToString(), 
       PubDate = DateTime.Parse(tweet["published"].ToString())                                    
     };                 
}

How can I asynchronously parse JSON data from a URL on a Windows phone and display it in a

Answer №1

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