Write data to GridView with json api (C# UWP)

Question

In C # UWP I would like to display the data from the Zomato API via Gridview, but when I run the following code there is no result. In the meantime, when I run the API in the browser, the json code works. Please help me. Thank you!

XAML code here:

<PivotItem Header="Restoranlar">
    <Grid SizeChanged="Grid_SizeChanged" Background="{ThemeResource SystemBaseLowColor}">
    <GridView x:Name="itemGridView">
        <GridView.ItemTemplate>
        <DataTemplate x:DataType="local:Restaurant">
            <Grid>
                <Image x:Name="menu" Source="{x:Bind photos_url}" HorizontalAlignment="Center" Stretch="Uniform"/>
                <StackPanel Margin="0,-25,0,0" Height="25" VerticalAlignment="Bottom">
                    <TextBlock x:Name="name" Text="{x:Bind name}" Style="{StaticResource TitleTextBlockStyle}" TextWrapping="Wrap" Foreground="White" FontSize="15" VerticalAlignment="Center" HorizontalAlignment="Center" FontWeight="SemiBold"/>
                </StackPanel>
                <TextBlock x:Name="ID" Text="{x:Bind url}" Style="{StaticResource TitleTextBlockStyle}" TextWrapping="Wrap" Foreground="White" FontSize="17" VerticalAlignment="Center" HorizontalAlignment="Center" FontWeight="SemiBold"/>
            </Grid>
        </DataTemplate>
        </GridView.ItemTemplate>
    </GridView>
    </Grid>
</PivotItem>

C# code here:

        private async void GetRestaurants()
        {
            try
            {
                string strBingImageURL = string.Format("https://developers.zomato.com/api/v2.1/search?apikey=" + APIKEY +"&count=10&lat=" + LatitudeF + "&lon=" + LongitudeF + "&category=restaurants&sort=real_distance&order=asc");
                string jsonText = "";

                HttpClient client = new HttpClient();
                HttpResponseMessage response = await client.GetAsync(new Uri(strBingImageURL));
                jsonText = await response.Content.ReadAsStringAsync();
                JsonArray jsonData1 = JsonArray.Parse(jsonText);

                foreach (JsonValue groupValue in jsonData1)
                {
                    if (jsonData1.Count > 0)
                    {
                        JsonObject groupObject = groupValue.GetObject();

                        string zname = groupObject["name"].GetString();
                        string zphotos = groupObject["photos_url"].GetString();
                        string zurl = groupObject["url"].GetString();

                        Restaurant file = new Restaurant();
                        file.name = zname;
                        file.url = zurl;
                        file.photos_url = zphotos;
                    }
                    else
                    {
                        //DoNothing
                    }
                }
            }
            catch (HttpRequestException ex)
            {
                //Catch Here
            }
        }

Restaurant class here:

    public class Restaurant
    {
        public string name { get; set; }
        public string url { get; set; }
        public string photos_url { get; set; }
    }

Answer 1

I assume your GetRestaurants method is in the code-behind of your View or in whatever you have as the DataContext for the View.

You'll need to add a public property of type List<Restaurant> or ObservableCollection<Restaurant>. Like so:

ObservableCollection<Restaurant> Restaurants { get; set; }

Then in your foreach your new Restaurant object file to this List or ObservableCollection. I would recommend using an ObservableCollection.

Finally in your View, all you need to do is add the Restaurants property as the GridView's ItemsSource. Like so:

<GridView x:Name="itemGridView" ItemsSource="{x:Bind Restaurants}">

-Edit-

Where you are also going wrong is with the JSON deserialization. You aren't actually deserializing it in your code. You need to actually deserialize it into the objects it expects a better explanation and example of JSON deserialization can be found in this answer on StackOverflow (see below for a snippet of what I've implemented to make your code work)

HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync(new Uri(zomatoURL));
jsonText = await response.Content.ReadAsStringAsync();
var result = JsonConvert.DeserializeObject<RootObject>(jsonText);

To see a full working sample of the Zomato API and some MVVM techniques see my sample here.