I am trying to deserialize simple json to an ObservableCollection. When I set a breakpoint for the Deserialization nothing seems to happen. The method never completes and it doesn't throw an error. I am able to get the json and convert to a string, just not deserialize to an ObservableCollection.
Am I missing something? I have looked at every code example I could find for deserializing to an object and can't seem to make it work.
This is the code for my Xamarin.Forms page.
public partial class Notification : ContentPage
{
public Notification()
{
InitializeComponent();
this.BindingContext = NotificationData();
}
public async Task NotificationData()
{
ObservableCollection<Alert> notification = await GetAlert();
NotificationList.ItemsSource = notification;
}
public static async Task<ObservableCollection<Alert>> GetAlert()
{
string WPPosts = "https://www.url.com/alerts.json";
HttpClient client = new HttpClient();
var response = await client.GetAsync(WPPosts).ConfigureAwait(false);
if (response != null)
{
ObservableCollection<Alert> data = new ObservableCollection<Alert>();
string content = response.Content.ReadAsStringAsync().Result;
//string content_sanitized = RemoveHTMLTags(content);
data = JsonConvert.DeserializeObject<ObservableCollection<Alert>>(content);
return data;
}
else { return null; }
}
public class Alert
{
public string title { get; set; }
public string imgUrl { get; set; }
public string content { get; set; }
}
public class RootObject
{
public List<Alert> alerts { get; set; }
}
}
This is my Xaml.
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" Title="News
and Alerts" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="JenksTrash.Notification" xmlns:local="clr-
namespace:JenksTrash" >
<ListView x:Name="NotificationList">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1" />
<ColumnDefinition Width="7*" />
</Grid.ColumnDefinitions>
<Label Text="{Binding title}" FontAttributes="Bold" />
<Label Text="{Binding content}" FontAttributes="Bold" />
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Any help understanding this would be amazing.
alerts
are nested under a root object, hence why you can't deserialize it directly.
But, you can try this:
JObject.Parse(content)
.SelectToken("alerts")
.ToObject<ObservableCollection<Alert>>();
This should help you understand the problem:
The json that you have is like RootObjectWithNestedNumberList
, but you were trying to deserialize it as a SimpleNumberList
. Obviously, it wasn't going to work.
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