How to fix the lambda expression delegate error? - json

Question

I am using this method to get data
private void getNews(int cat_id, int page)
{
this.progress.Visibility = Visibility.Visible;
var m = new SharpGIS.GZipWebClient();
Microsoft.Phone.Reactive.Observable.FromEvent<DownloadStringCompletedEventArgs>(m, "DownloadStringCompleted").Subscribe(l =>
{
try
{
//List<NewsKeys> deserialized = JsonConvert.DeserializeObject<List<NewsKeys>>(r.EventArgs.Result);
ObservableCollection<NewsKeys> deserialized = JsonConvert.DeserializeObject<List<NewsKeys>>(l.EventArgs.Result);
foreach (NewsKeys item in deserialized)
{
items.Add(new NewsKeys { nId = item.nId, title = item.title, shortDesc = item.shortDesc, fullDesc = item.fullDesc, tags = item.tags, smallPic = item.smallPic, bigPic = item.bigPic, video = item.video, audio = item.audio, youtube = item.youtube, doc = item.doc, date_create = item.date_create, date_modify = item.date_modify, date_publish = item.date_publish, catId = item.catId, viewOrder = item.viewOrder, viewCount = item.viewCount, viewStatus = item.viewStatus, viewHome = item.viewHome, uId = item.uId, uFname = item.uFname });
}
}
catch (Exception)
{
MessageBox.Show("Sorry, Some unexpected error.");
}
});
m.DownloadStringAsync(new Uri(Resource.NEWS_API+cat_id+"&page="+page));
}
The error i get is
Error 1 Cannot convert lambda expression to type 'System.IObserver>' because it is not a delegate type C:\Users\Adodis\Documents\Visual Studio 2010\Projects\TV\NewsListPage.xaml.cs 51 133
I have tried all the fixes but unable to fix this problem. Am using the same block in different method in a different class it is working fine but, this method in this class killing me. Please help me if you have idea on this.
Thanks in advance.

Answer 1

Try this (I've separated the Select and Subscribe operations):
var m = new SharpGIS.GZipWebClient();
Observable.FromEvent<DownloadStringCompletedEventArgs>(m, "DownloadStringCompleted")
.Select(l => l.EventArgs.Result)
.Subscribe(res =>
{
try
{
var deserialized = JsonConvert.DeserializeObject<List<NewsKeys>>(res);
foreach (NewsKeys item in deserialized)
{
items.Add(
new NewsKeys
{
nId = item.nId,
title = item.title,
shortDesc = item.shortDesc,
fullDesc = item.fullDesc,
tags = item.tags,
smallPic = item.smallPic,
bigPic = item.bigPic,
video = item.video,
audio = item.audio,
youtube = item.youtube,
doc = item.doc,
date_create = item.date_create,
date_modify = item.date_modify,
date_publish = item.date_publish,
catId = item.catId,
viewOrder = item.viewOrder,
viewCount = item.viewCount,
viewStatus = item.viewStatus,
viewHome = item.viewHome,
uId = item.uId,
uFname = item.uFname
});
}
}
catch (Exception)
{
MessageBox.Show("Sorry, Some unexpected error.");
}
});
m.DownloadStringAsync(new Uri("Resource.NEWS_API" + cat_id + "&page=" + page));