BindableLayout cannot convert to 'System.Collections.IEnumerable'

Question

Hi,

I am trying to read the REST from:

https://documentation.onesignal.com/reference/view-notification

but getting:

cannot convert to 'System.Collections.IEnumerable'

I tried both:

Root data = JsonSerializer.Deserialize<Root>(result);

and:

Root data = (Root)JsonSerializer.Deserialize<IEnumerable<Root>>(result);

This is my code:

var client = new HttpClient();

UriBuilder builder = new UriBuilder(string.Format("https://onesignal.com/api/v1/notifications/{0}", message_id));
builder.Query = "app_id=" + SecureStorage.GetAsync("AppID").Result;

client.DefaultRequestHeaders.Add("authorization", "Basic " + SecureStorage.GetAsync("AppAuthID").Result);

var response = await client.GetAsync(builder.Uri);

var result = await response.Content.ReadAsStringAsync();

// Root data = JsonSerializer.Deserialize<Root>(result);
Root data = (Root)JsonSerializer.Deserialize<IEnumerable<Root>>(result);

BindableLayout.SetItemsSource(ScrollViewNotification, data);

Here is the Class:

public class Contents
{
    public string ar { get; set; }
    public string en { get; set; }
}

public class Data
{
}

public class Headings
{
}

public class ApnsAlert
{
}

public class Ios
{
    public int successful { get; set; }
    public int failed { get; set; }
    public int errored { get; set; }
    public int converted { get; set; }
    public int received { get; set; }
}

public class Android
{
    public int successful { get; set; }
    public int failed { get; set; }
    public int errored { get; set; }
    public int converted { get; set; }
    public int received { get; set; }
}

public class PlatformDeliveryStats
{
    public Ios ios { get; set; }
    public Android android { get; set; }
}

public class Root
{
    public object adm_big_picture { get; set; }
    public object adm_group { get; set; }
    public object adm_group_message { get; set; }
    public object adm_large_icon { get; set; }
    public object adm_small_icon { get; set; }
    public object adm_sound { get; set; }
    public object spoken_text { get; set; }
    public object alexa_ssml { get; set; }
    public object alexa_display_title { get; set; }
    public object amazon_background_data { get; set; }
    public object android_accent_color { get; set; }
    public object android_group { get; set; }
    public object android_group_message { get; set; }
    public object android_led_color { get; set; }
    public object android_sound { get; set; }
    public int android_visibility { get; set; }
    public string app_id { get; set; }
    public object big_picture { get; set; }
    public object buttons { get; set; }
    public bool canceled { get; set; }
    public object chrome_big_picture { get; set; }
    public object chrome_icon { get; set; }
    public object chrome_web_icon { get; set; }
    public object chrome_web_image { get; set; }
    public object chrome_web_badge { get; set; }
    public object content_available { get; set; }
    public Contents contents { get; set; }
    public int converted { get; set; }
    public Data data { get; set; }
    public object delayed_option { get; set; }
    public object delivery_time_of_day { get; set; }
    public int errored { get; set; }
    public List<object> excluded_segments { get; set; }
    public int failed { get; set; }
    public object firefox_icon { get; set; }
    public object global_image { get; set; }
    public Headings headings { get; set; }
    public string id { get; set; }
    public object include_player_ids { get; set; }
    public object include_external_user_ids { get; set; }
    public List<string> included_segments { get; set; }
    public object thread_id { get; set; }
    public int ios_badgeCount { get; set; }
    public object ios_badgeType { get; set; }
    public object ios_category { get; set; }
    public string ios_interruption_level { get; set; }
    public double ios_relevance_score { get; set; }
    public object ios_sound { get; set; }
    public ApnsAlert apns_alert { get; set; }
    public object target_content_identifier { get; set; }
    public bool isAdm { get; set; }
    public bool isAndroid { get; set; }
    public bool isChrome { get; set; }
    public bool isChromeWeb { get; set; }
    public object isAlexa { get; set; }
    public bool isFirefox { get; set; }
    public bool isIos { get; set; }
    public bool isSafari { get; set; }
    public bool isWP { get; set; }
    public bool isWP_WNS { get; set; }
    public bool isEdge { get; set; }
    public bool isHuawei { get; set; }
    public bool isSMS { get; set; }
    public object large_icon { get; set; }
    public int priority { get; set; }
    public int queued_at { get; set; }
    public int remaining { get; set; }
    public int send_after { get; set; }
    public int completed_at { get; set; }
    public object small_icon { get; set; }
    public int successful { get; set; }
    public object received { get; set; }
    public object tags { get; set; }
    public object filters { get; set; }
    public object template_id { get; set; }
    public int ttl { get; set; }
    public object url { get; set; }
    public object web_url { get; set; }
    public object app_url { get; set; }
    public object web_buttons { get; set; }
    public object web_push_topic { get; set; }
    public object wp_sound { get; set; }
    public object wp_wns_sound { get; set; }
    public PlatformDeliveryStats platform_delivery_stats { get; set; }
    public object ios_attachments { get; set; }
    public object huawei_sound { get; set; }
    public object huawei_led_color { get; set; }
    public object huawei_accent_color { get; set; }
    public string huawei_visibility { get; set; }
    public object huawei_group { get; set; }
    public object huawei_group_message { get; set; }
    public object huawei_channel_id { get; set; }
    public object huawei_existing_channel_id { get; set; }
    public object huawei_small_icon { get; set; }
    public object huawei_large_icon { get; set; }
    public object huawei_big_picture { get; set; }
    public object huawei_msg_type { get; set; }
    public object throttle_rate_per_minute { get; set; }
    public object sms_from { get; set; }
    public object sms_media_urls { get; set; }
    public object name { get; set; }
    public object email_click_tracking_disabled { get; set; }
    public object fcap_group_ids { get; set; }
    public string fcap_status { get; set; }
}

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

I'm afraid you need to change the Root data = (Root)JsonSerializer.Deserialize<IEnumerable<Root>>(result); to

 Root data = JsonConvert.DeserializeObject<Root>(result);  

From the Txt file your provided, we can see this result is not a list, the json formart is {......}, so it cannot convert to System.Collections.IEnumerable , only this formart [......] can be converted .

In addition, android_visibility , ios_badgeCount, ios_relevance_score , isSMS , priority , ttl these fields are null in the Txt file your provided, however, they cannot be null. So, I change these Property Type to object in class Root.

public object android_visibility { get; set; }  

For more information about IEnumerable Interface , you could refer to
https://learn.microsoft.com/en-us/dotnet/api/system.collections.ienumerable?view=net-6.0

------------update-----------
According to your StackLayout, if you use BindableLayout.SetItemsSource, the layout is a collection, you could set ItemTemplate, refer to the following code :

 var data = JsonConvert.DeserializeObject<Root>(json);  
 var bindObject = new Root[]  
                 {  
                    data,  
                 };  
 BindableLayout.SetItemsSource(StackLayoutNotification, bindObject);  

Xaml

<StackLayout x:Name="StackLayoutNotification">  
            <BindableLayout.ItemTemplate>  
                <DataTemplate>  
                    <Grid>  
                <Grid.RowDefinitions>  
                    <RowDefinition Height="Auto" />  
                    <RowDefinition Height="Auto" />  
                </Grid.RowDefinitions>  
  
                <Label TextColor="Yellow" Grid.Row="0" Text="{Binding id}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" HorizontalTextAlignment="Start" FontSize="20" LineBreakMode="WordWrap" />  
            </Grid>  
                </DataTemplate>  
            </BindableLayout.ItemTemplate>  
  </StackLayout>  

For more information, you could refer to https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/layouts/bindable-layouts

In addition, I noticed that there is only one object, you also could use MVVM and Data Binding to bind Root class.

Best Regards,
Wenyan Zhang

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