Getting Ads and Ad Gallery to ListView

Question

User969992919 posted

Hi,

I have below code in my project.

public class HomePageData
{
    public int ad_id { get; set; }
    public static string ad_guid { get; set; }
    public string ad_gallery_guid { get; set; }
    public string user_guid { get; set; }
    public string display_name { get; set; }
    public string ad_currency { get; set; }
    public double? ad_price { get; set; }
    public DateTime created_date { get; set; }

    public ObservableCollection<AdGalleryData> gallery
    {
        get { return gallery1; }
        set { gallery1 = value; }
    }

    public ObservableCollection<AdGalleryData> gallery1 = new ObservableCollection<AdGalleryData>();

    public HomePageData()
    {
        gallery.Add(new AdGalleryData());

        // gallery.Add(new AdGalleryData() { gallery_image = "https://www.zeera.online/gallery/ads/" + ad_guid + "/" + gallery[0].ad_guid + ".png" });
    }

}


public class AdGalleryData
{
    public string ad_guid { get; set; }
    public string ad_gallery_guid { get; set; }
    private string gallery_image1 = "https://www.zeera.online/gallery/ads/25914ccb-7dd2-11e9-be21-0cc47a4422ec/8ac825c0-8399-11e9-be21-0cc47a4422ec.png";

    public string gallery_image
    {
        get
        {
            return gallery_image1;
            // return string.Format("https://www.zeera.online/gallery/ads/{0}/{1}.png", HomePageData.ad_guid, ad_gallery_guid);
        }
        set { gallery_image1 = value; }

    }

    public AdGalleryData()
    {

    }
}

and I am populating the data from my database like this:

public async void populate_homepage()
{
    sort_by = Preferences.Get("HomePageSortBy", "ad_id");
    sort_direction = Preferences.Get("HomePageSortDirection", "DESC");

    var client = new HttpClient();

    client.BaseAddress = new Uri("https://app.zeera.online/webservices/v1/release/www/populate_homepage_ads.php");

    var content = new FormUrlEncodedContent(new[]
    {
        new KeyValuePair<string, string>("language", "EN"),
        new KeyValuePair<string, string>("sort_by", sort_by),
        new KeyValuePair<string, string>("sort_direction", sort_direction)
    });

    var response = await client.PostAsync("https://app.zeera.online/webservices/v1/release/www/populate_homepage_ads.php", content);

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

    var result1 = JsonConvert.DeserializeObject<List<HomePageData>>(data);
    var result = result1.Distinct<HomePageData>(new ItemEqualityComparer());

    ObservableCollection<HomePageData> trends;
    ObservableCollection<ObservableCollection<AdGalleryData>> datas = new ObservableCollection<ObservableCollection<AdGalleryData>>();

    if (result != null)
    {
        trends = new ObservableCollection<HomePageData>(result);

    }
    else
    {
        trends = new ObservableCollection<HomePageData>();

        var gallery = new ObservableCollection<AdGalleryData>();

        datas.Add(gallery);

        for (int i = 0; i < datas.Count; i++)
        {
            trends.Add(new HomePageData() { gallery = datas[i] });
        }
    }

    ListViewHomePage.ItemsSource = trends;

    loadingHomePage.IsVisible = false;

    ListViewHomePage.IsVisible = true;
}

class ItemEqualityComparer : IEqualityComparer<HomePageData>
{
    public bool Equals(HomePageData x, HomePageData y)
    {
        return x.ad_id == y.ad_id;
    }

    public int GetHashCode(HomePageData obj)
    {
        return obj.ad_id.GetHashCode();
    }
}

Every ad is having multiple ad gallery [photo]

I have no issue getting the ads listed but how can I add the gallery?

the photo url is like this:

https://www.zeera.online/gallery/ads/[[[ad_guid]]]/[[[ad_guid]]].png

both ad_guid and ad_gallery_guid coming from the same populate_homepage_ads.php above

so how can I pass that to the public HomePageData()?

I tried to do it this way:

gallery.Add(new AdGalleryData() { gallery_image = "https://www.zeera.online/gallery/ads/" + ad_guid + "/" + ad_gallery_guid + ".png" });

but the ad_gallery_guid is unknown inside HomePageData()

Kindly help...

Thanks,

Jassim

Answer 1

User288213138 posted

Hi jrahma,

I'm sorry for not answering your question in time.

jrahma

gallery.Add(new AdGalleryData() { gallery_image = "https://www.zeera.online/gallery/ads/" + ad_guid + "/" + ad_gallery_guid + ".png" });

but the ad_gallery_guid is unknown inside HomePageData()

jrahma

public static string ad_guid { get; set; }
    public string ad_gallery_guid { get; set; }

 In a class first execute the constructor, then assign a value to the property. So it's not possible to get the value of an attribute directly through a constructor unless the property is static, that's why you can get ad_guid but not ad_gallery_guid.

You can try below code, get ad_gallery_guid in get{}.

public ObservableCollection<AdGalleryData> gallery
        {
            get
            {
                ObservableCollection<AdGalleryData> data = new ObservableCollection<AdGalleryData>();
                gallery.Add(new AdGalleryData() { gallery_image = "https://www.zeera.online/gallery/ads/" + HomePageData.ad_guid + "/" + ad_gallery_guid + ".png" });
                return data;
            }
            set { gallery1 = value; }
        }

Best regards,

Sam.

Answer 2

User969992919 posted

No Worries Sam

So you recommend to set ad_gallery_guid as static in this case?

From your above fix,

 i changed my code as you can see below but it's not showing the data and here is the link:

https://www.jassimrahma.net/temp/populate_homepage_ads.php

public class HomePageData
{
    public int ad_id { get; set; }
    public static string ad_guid { get; set; }
    public string ad_gallery_guid { get; set; }
    public string user_guid { get; set; }
    public string display_name { get; set; }
    public string ad_currency { get; set; }
    public double? ad_price { get; set; }
    public DateTime created_date { get; set; }

    /*
    public ObservableCollection<AdGalleryData> gallery
    {
        get { return gallery1; }
        set { gallery1 = value; }
    }
    */

    public ObservableCollection<AdGalleryData> gallery
    {
        get
        {
            ObservableCollection<AdGalleryData> data = new ObservableCollection<AdGalleryData>();
            gallery.Add(new AdGalleryData() { gallery_image = "https://www.zeera.online/gallery/ads/" + HomePageData.ad_guid + "/" + ad_gallery_guid + ".png" });
            return data;
        }
        set { gallery1 = value; }
    }

    public ObservableCollection<AdGalleryData> gallery1 = new ObservableCollection<AdGalleryData>();

    public HomePageData()
    {
        gallery.Add(new AdGalleryData());

        // gallery.Add(new AdGalleryData() { gallery_image = "https://www.zeera.online/gallery/ads/" + ad_guid + "/" + gallery[0].ad_guid + ".png" });

        gallery.Add(new AdGalleryData() { gallery_image = string.Format("https://www.zeera.online/gallery/ads/{0}/{1}.png", ad_guid, ad_gallery_guid) });

        // CONSOLE OUTPUT TEMP
        System.Diagnostics.Debug.WriteLine("STARTING OUTPUT GALLERY");
        for (int i = 0; i < gallery.Count; i++)
        {
            System.Diagnostics.Debug.WriteLine(string.Format("https://www.zeera.online/gallery/ads/{0}/{1}.png", gallery[i].ad_guid, gallery[i].ad_gallery_guid));
        }
        System.Diagnostics.Debug.WriteLine("COMPLETED OUTPUT GALLERY");
        // CONSOLE OUTPUT TEMP
    }

}


public class AdGalleryData
{
    public string ad_guid { get; set; }
    public string ad_gallery_guid { get; set; }
    private string gallery_image1 = "https://www.zeera.online/gallery/ads/25914ccb-7dd2-11e9-be21-0cc47a4422ec/8ac825c0-8399-11e9-be21-0cc47a4422ec.png";

    public string gallery_image
    {
        get
        {
            return gallery_image1;
            // return string.Format("https://www.zeera.online/gallery/ads/{0}/{1}.png", HomePageData.ad_guid, ad_gallery_guid);
        }
        set { gallery_image1 = value; }

    }

    public AdGalleryData()
    {

    }
}

and populating the data here:

public async void populate_homepage()
{
    sort_by = Preferences.Get("HomePageSortBy", "ad_id");
    sort_direction = Preferences.Get("HomePageSortDirection", "DESC");

    var client = new HttpClient();

    client.BaseAddress = new Uri("https://www.jassimrahma.net/temp/populate_homepage_ads.php");

    var content = new FormUrlEncodedContent(new[]
    {
        new KeyValuePair<string, string>("language", "EN"),
        new KeyValuePair<string, string>("sort_by", sort_by),
        new KeyValuePair<string, string>("sort_direction", sort_direction)
    });

    var response = await client.PostAsync("https://www.jassimrahma.net/temp/populate_homepage_ads.php", content);

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

    var result1 = JsonConvert.DeserializeObject<List<HomePageData>>(data);
    var result = result1.Distinct<HomePageData>(new ItemEqualityComparer());

    ObservableCollection<HomePageData> trends;
    ObservableCollection<ObservableCollection<AdGalleryData>> datas = new ObservableCollection<ObservableCollection<AdGalleryData>>();

    if (result != null)
    {
        trends = new ObservableCollection<HomePageData>(result);

    }
    else
    {
        trends = new ObservableCollection<HomePageData>();

        var gallery = new ObservableCollection<AdGalleryData>();

        datas.Add(gallery);

        for (int i = 0; i < datas.Count; i++)
        {
            trends.Add(new HomePageData() { gallery = datas[i] });
        }
    }

    ListViewHomePage.ItemsSource = trends;

    loadingHomePage.IsVisible = false;

    ListViewHomePage.IsVisible = true;
}