Question

I made a custom Class named MedinetParse that parses a webrequest. The parsed data should be showen in a listbox named mittSchemaListBox in the my MainPage. The problem that i’m facing now is that IF i write the parsing method in a custom class named MedinetParse the listbox showes nothing. Althought when i put a breakpoint at the very last line of code inside the parse method, i can see that mittSchemaListBox.ItemsSource have all the parsed items. Meanwhile if i move the parsing method into my MainPage.xaml.cs, then i will see all the parsed item in my listbox.

Here is my MedinetParsing class

namespace WindowsPhonePanoramaApplication1
{
public class MedinetParsing : MainPage
{
    //Defining class properties
    public string Placering { get; set; }
    public string Datum { get; set; }
    //Defining class methods
    public void parseResults(string myresponse)
    {
        if (string.IsNullOrEmpty(myresponse))
        {
            return;
        }

        //Initiating a listbox and add item to it
        List<ItemViewModel> mittSchemaList = new List<ItemViewModel>();
        //Using HtmlAgilityPack to parse the HTMLcode from the response
        HtmlDocument htdoc = new HtmlDocument();
        htdoc.LoadHtml(myresponse);
        foreach (HtmlNode table in htdoc.DocumentNode.SelectNodes("//table[@class='list-medium']/tbody[1]/tr[@class]"))
        {
            //Removing ChildNode
            table.ChildNodes.RemoveAt(3);
            string itemValue = table.InnerText;
            //Changing the parsed date into a DateTime
            string d;
            DateTime datum = DateTime.Parse(itemValue.Remove(11));
            d = datum.ToString("D");
            //Adding items to the listbox
            mittSchemaList.Add(new ItemViewModel() { Datum = d, Placering = itemValue.Remove(0, 15) });
        }
        mittSchemaListBox.ItemsSource = mittSchemaList;

    }
}
}

Here is the code that initiate the parse:-

    public void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        if (!App.ViewModel.IsDataLoaded)
        {
            App.ViewModel.LoadData();
        }
        MedinetWebRequest mittschema = new MedinetWebRequest();
        MedinetParsing mittparse = new MedinetParsing();
        mittschema.url = "https://medinet.se/cgi-bin/doctor.pl?action=login&customer=******&language=se";
        Action callback = () => Dispatcher.BeginInvoke(() => mittparse.parseResults(mittschema.myresponse));
        mittschema.getrequest(callback); 
    }

And lastly this is my Listbox:-

<ListBox Margin="0,0,-12,0" Name="mittSchemaListBox" DataContext="{Binding}" ItemsSource="{Binding Path=Items}">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal" Margin="0,0,0,17">
                            <!--Replace rectangle with image-->
                            <Canvas Height="100" Width="100" Margin="12,0,9,0" Background="#FFE5001B">
                                <TextBlock Text="{Binding Datum}" TextWrapping="Wrap" Height="100" Margin="0" HorizontalAlignment="Right" Width="100" />
                            </Canvas>
                            <StackPanel Width="311">
                                <TextBlock Text="{Binding Placering}" TextWrapping="Wrap" Margin="0,10" Style="{StaticResource PhoneTextExtraLargeStyle}" FontSize="36" TextAlignment="Center" FontWeight="Normal" />
                            </StackPanel>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

Been trying to fix this issue for the last few hours and not getting anywhere, i decided to ask here. Hope someone can tell me what is the problem.

Answer 1

Could not answer my question last night so here is the answer.

Again after few hours getting back and forth with my code i just found out a solution that fits my app. The solution is that i changed this line of code in my MedinetParsing class

mittSchemaList.Add(new ItemViewModel() { Datum = d, Placering = itemValue.Remove(0, 15) });

with this one:-

App.ViewModel.Items.Add(new ItemViewModel() {Datum=d,Placering=itemValue.Remove(0,15)}); 

Got rid of this line of code:-

mittSchemaListBox.ItemsSource = mittSchemaList;

Now it is working like it should and i’m happy ;).
Hope this will help someothers if they face such a problem.

Yours