I'm trying to return json data from a list within a list. The data is being pulled using a webclient and deserialized using JSON.NET. I'd like to return a name and image from the "featuredCharts" list which is within the "Results" list. Here is part of the json data I'm referring to.
"results":{
"featuredCharts":[
{
"id":46082,
"type":"chart",
"name":"Exclusives On Beatport - Week 5",
"slug":"exclusives-on-beatport-week-5",
"description":"",
"publishDate":"2012-01-30",
"price":{
"code":"usd",
"symbol":"$",
"value":2390
},
"audioFormatFee":{
"wav":{
"code":"usd",
"symbol":"$",
"value":1000
},
"aiff":{
"code":"usd",
"symbol":"$",
"value":1000
}
},
"genres":[
{
"id":11,
"name":"Tech House",
"slug":"tech-house",
"type":"genre"
},
{
"id":5,
"name":"House",
"slug":"house",
"type":"genre"
},
{
"id":17,
"name":"Electro House",
"slug":"electro-house",
"type":"genre"
},
{
"id":15,
"name":"Progressive House",
"slug":"progressive-house",
"type":"genre"
}
],
"images":{
"small":{
"width":30,
"height":30,
"url":"http:\/\/geo-media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/40\/4951247.jpg",
"secureUrl":"https:\/\/media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/40\/4951247.jpg"
},
"medium":{
"width":60,
"height":60,
"url":"http:\/\/geo-media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/40\/4951248.jpg",
"secureUrl":"https:\/\/media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/40\/4951248.jpg"
},
"large":{
"width":130,
"height":130,
"url":"http:\/\/geo-media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/40\/4951249.jpg",
"secureUrl":"https:\/\/media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/40\/4951249.jpg"
},
"xlarge":{
"width":500,
"height":500,
"url":"http:\/\/geo-media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/50\/4951250.jpg",
"secureUrl":"https:\/\/media.beatport.com\/items\/imageCatalog\/4000000\/900000\/50000\/1000\/200\/50\/4951250.jpg"
}
},
"chartOwner":null
},
My classes are currently setup like this.
public class NewReleasesCharts //Root Object
{
public Metadata metadata { get; set; }
public List<ResultHome> results = new List<ResultHome>();
public IEnumerator<ResultHome> GetEnumerator()
{
return this.results.GetEnumerator();
}
}
public class ResultHome
{
public List<FeaturedCharts> featuredCharts { get; set; }
public List<FeaturedReleases> featuredReleases { get; set; }
}
public class FeaturedCharts
{
public int id { get; set; }
public string type { get; set; }
public string name { get; set; }
public string slug { get; set; }
public ChartImages chartImages { get; set; }
}
public class ChartImages
{
public ChartSmall chartSmall { get; set; }
public ChartMedium chartMedium { get; set; }
public ChartLarge chartLarge { get; set; }
}
public class ChartMedium
{
public int width { get; set; }
public int height { get; set; }
public string url { get; set; }
public string secureUrl { get; set; }
}
This is the part I'm stuck on. After deserializing the data I'm using nested foreach loops, but i currently get an NullReferenceException error on rc.featuredCharts in the inner foreach loop. Here is the code.
// Deserialize home page data
void jsonHome_GetDataCompleted(object snder, DownloadStringCompletedEventArgs e)
{
NewReleasesCharts homeData = JsonConvert.DeserializeObject<NewReleasesCharts>(e.Result);
try
{
// Nested foreach loops to dispaly data
foreach (ResultHome rc in homeData)
{
foreach (FeaturedCharts fc in rc.featuredCharts)
{
// TODO: return name and image of chart
string name = fc.name;
listGenres.Items.Add(name);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
I'm still a beginner when it comes to c# so i'm not sure what I'm doing wrong. An example of how to do this properly would give me something to build off of, as i'll need to do this in other parts of my app.
Thanks.
UPDATE Here is the full exception:
System.NullReferenceException was unhandled
Message=NullReferenceException StackTrace: at Beatport.MainPage.jsonHome_GetDataCompleted(Object snder, DownloadStringCompletedEventArgs e) at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e) at System.Net.WebClient.DownloadStringOperationCompleted(Object arg) at System.Reflection.RuntimeMethodInfo.InternalInvoke(RuntimeMethodInfo rtmi, Object obj, BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess, StackCrawlMark& stackMark) at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) at System.Delegate.DynamicInvokeOne(Object[] args) at System.MulticastDelegate.DynamicInvokeImpl(Object[] args) at System.Delegate.DynamicInvoke(Object[] args) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.Dispatch(DispatcherPriority priority) at System.Windows.Threading.Dispatcher.OnInvoke(Object context) at System.Windows.Hosting.CallbackCookie.Invoke(Object[] args) at System.Windows.Hosting.DelegateWrapper.InternalInvoke(Object[] args) at System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(IntPtr pHandle, Int32 nParamCount, ScriptParam[] pParams, ScriptParam& pResult)
