Question

I am trying to bind my object list to a listbox.

Here is the object list definition:

class LoadFactory : INotifyCollectionChanged
{
    public ObservableCollection<Load> Loads = new ObservableCollection<Load>();


    public LoadFactory()
    {
        AddLoad(new Load(15));
        AddLoad(new Load(12));
        AddLoad(new Load(25));

    }

    public int LoadCount()
    {
        return Loads.Count();
    }

    public void AddLoad(Load load)
    {
        Loads.Add(load);
        if (CollectionChanged != null)
            CollectionChanged(this, new NotifyCollectionChangedEventArgs(new NotifyCollectionChangedAction()));
    }

    public event NotifyCollectionChangedEventHandler CollectionChanged;

    public ObservableCollection<Load> GetLoads()
    {
        return new ObservableCollection<Load>(Loads);
    }
}

public class Load
{
    public static int LoadCount=0;
    public int Index = 0;
    public Load(float LoadMagnitude)
    {
        magnitude = LoadMagnitude;
        Index = LoadCount;
        LoadCount++;
    }

    private float magnitude;

    public float Magnitude
    {
        get
        {
            return magnitude;
        }
        set
        {
            magnitude = value;
        }
    }

    public float ToFloat()
    {
        return magnitude;
    }

    public override string ToString()
    {
        return magnitude.ToString() + " ft";
    }
}

And here is my XAML:

<Window x:Class="Sunny3.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:Sunny3"
    Title="MainWindow" Height="500" Width="1000">
<Grid>
        <Grid Name="motherGrid">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Button Grid.Row="1" Click="Button_Click_1">Hello</Button>
        <ListBox Grid.Row="2" ItemsSource="{Binding}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <DataTemplate.Resources>
                        <Style TargetType="TextBox">
                            <Setter Property="Margin" Value="3"></Setter>
                            <Setter Property="FontSize" Value="20"></Setter>
                            <Setter Property="Width" Value="70"></Setter>
                            <Setter Property="Foreground" Value="Blue"></Setter>
                        </Style>
                    </DataTemplate.Resources>
                    <StackPanel>
                        <Grid>
                            <TextBox Text="{Binding Path=.}"></TextBox>
                        </Grid>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Grid>

And my code behind:

public partial class MainWindow : Window
{
    LoadFactory LF;

    public MainWindow()
    {
        LF = new LoadFactory();
        InitializeComponent();
        this.DataContext = LF.Loads;
    }

    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        Load newone = new Load(154);
        LF.AddLoad(newone);
    }
}

The problem is that the I cannot seem to get my loads bound to the text boxes.

Any suggestions?

Answer 1

You need to make Loads a property, not a field.

public ObservableCollection<Load> Loads { get; set; }

public LoadFactory()
{
    Loads = new ObservableCollection<Load>();
    AddLoad(new Load(15));
    AddLoad(new Load(12));
    AddLoad(new Load(25));
}

The text box binding should be to a property within the load class.

<TextBox Text="{Binding Path=Magnitude}"></TextBox>