Ddisplay of a List into a ListBox does not work

Pierre Michallet

8y723Learn iOS Programming

I am developing, for the fun, a board game from African origin called Awalé.

Briefly, it is played by 2 persons using a board with 2 rows of 6 "pits"; each "pit" contains

4 "stones" when the game starts.

Players play in turns and the objective is to catch as many "stones" as possible according

to rules that I have not yet implemented.

The UI is implemented around a 6 rows by 4 columns grid.

The problem lies around a 6 by 2 uniform grid located in row 2 column 2 of the above mentioned grid.

This uniform grid is where the number of "stones" contained in each "pit" should be displayed.

For the moment this does not work.

Although I am far from mastring it, I have tried to follow the MVVM pattern.

All the source code is attached.

A few indications to make it easier to track the problem.

The UI is defined within the View.xaml file and the point of interest is a ListBox

(lines 117 thru 133) which is in charge of displaying the "pits" content in the 6 by 2 uniform

grid mentioned above.

The ListBox is bound to a List list called Items (see file ViewModel.cs lines 97 thru 103 where this list is declared together with a class called Pit).

List is initialized within the file NewGameDelegateCommand.cs (lines 50 to 61).

A stop has been put on line 50, and I have verified that 12 elements (instances of the Pit class) have been added to the Items List.

The problem.

The content of the Items list is not displayed when the "New game" menu is clicked.

On the contrary, the "Score North" and "Score South" fields are correctly set to 8 and 2

respectively as required in lines 47 and 47 of the NewGameDelegateCommand.cs file.

The code has been developed with Visual Studio 2017 using .NET Framework 4.6.1.

Every help is welcom.

Thank you in advance

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Pierre Michallet8y ago
Hi Sagar,

Thank you for your answer.
Unfortunately, the clues given on StackOverflow are for WinForms apps.
Anyhow, I have found that the problem was due to a poor implementation around the ListBox.

In the ViewModel.cs file, I have declared the following elements:
              public class Pit
               {
                    public string PitContent {get; set;}
              }

              public List Items = new List

For the binding to take place and show in the UI ListBox the content of the list, I should have done the following declarations:

In the Model (file Pit.cs)
              public class Pit: INotifyPropertyChanged
              {
                    public event PropertyChangedEventHandler PropertyChanged;
                    public void OnPropertyChanged (string propertyName)
                    {
                          if (PropertyChanged != null)
                          {
                             PropertyChanged(this, new PropertyChangedArgs (propertyName);
                          }
                    }
              }

              public string PitContent
              {
                    get
                    {
                          return PitContent;
                    }
                    set
                    {
                          pitContent =value;
                          OnPropertyChanged ("PitContent");
                    }

              }

In the ViewModel (file PitViewModel.cs)
              public class pitViewModel
              {
                    private IList pitList;
                    public PitViewModel()
                    {
                          new Pit() {PitContent = "0"},
                          new Pit() {PitContent = "1"}
                    }
              }

              public IList Pits
              {
                       get { return pitList; }
                       set { pitList = value; }
               }

Binding the ListBox to Pits will show "0" and "1" in it;

Besides this, I have changed the structure of the application to make it simpler and now this part works correctly.

Have a nice day.
Sagar Pandurang Kap8y ago
Hi,
Try below link :-

https://stackoverflow.com/questions/4321300/c-easiest-way-to-populate-a-listbox-from-a-list

it might helps...