Dont display the button if any value exist in quantity

Goal:

The button named "btnReturn" should not be displayed if the value of the quantity is 0 and minus.

Problem:

Have considered alot and I can't find a solution to make the button not to be invisible. It can be a XAML code or C#.

Please remember that you have lots of product to be displayed and I also used datacontext to sync between XAML and list.

private void UpdateGUI(int pSaleId)
{
    lstRepurchase.DataContext = _myManagerProduct_SaleAndProductQuantity.DisplaySoldProductInTheRepurchaseListView(pSaleId);
}

<ListView  Canvas.Left="8" Canvas.Top="49.494" ItemsSource="{Binding}" SelectionMode="Single" Margin="236.78,17.48,8,44.707" Name="lstRepurchase">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="Article Number" Width="auto" DisplayMemberBinding="{Binding Path=_articleNumber}" Te开发者_开发知识库xtBlock.TextAlignment="Left" />                                  
                <GridViewColumn Header="Name" Width="auto" DisplayMemberBinding="{Binding Path=_name}" TextBlock.TextAlignment="Left" />
                <GridViewColumn Header="Quantity" Width="auto" DisplayMemberBinding="{Binding Path=_quantity}" TextBlock.TextAlignment="Left" />                                            
                <GridViewColumn>
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <Button Name="btnReturn" MinHeight="20" MinWidth="50" Content="Delete" Click="btnReturn_Click" />
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
            </GridView>
        </ListView.View>
    </ListView> 

---

Here is a converter for Int32 to Visability. Now the syntax for passing the count to the convert could need to bind to the ItemSource for count.

    [ValueConversion(typeof(Int32), typeof(Visibility))]
    public class IntVisabilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Int32 inCount = (Int32)value;
            if (inCount > 0) return Visibility.Visible;
            else return Visibility.Collapsed;
        }
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return true;
        }
    }

XAML

    <xmlns:local="clr-namespace:yourNameSpace"        
    <local:VisabilityConverter x:Key="visabilityConverter"/>
    Visibility="{Binding Path=Count, Converter={StaticResource visabilityConverter}

You will need to read up for where those lines go but they are all on the XAML.

---

You will need to bind the Visibility property to the _quantity property and use a converter which takes in the quantity and returns a visibility.

Here is some information regarding converters:

http://www.codeproject.com/KB/WPF/OppositeBoolConverter.aspx

---

So you want the button to change Visibility when 'quantity' is zero or less. Try messing around with the button's visible or visibility property. This C# code will make a Windows Form button invisible:

if(quantity <=0)
    btnReturn.Visibile = false;

---

Consider using Boolean-to-Visibility Converter, see an example of custom and flexible converter here - BooleanToVisibilityConverter by Kent Boogaart. Or use built-in BooleanToVisibilityConverter Class

1) Define boolean property like

public bool IsQuantityGreaterThenZero
{
  get
  {  
      return this.quantity > 0;
  }
}

2) Update buttond definition in XAML to use binding with converter in place:

<Button Visibility="{Binding IsQuantityGreaterThenZero,
        Converter={StaticResource yourConverter}}"/>

---

Don't reinvent the wheel. The Boolean to Visibility converter is native in WPF:

http://msdn.microsoft.com/en-us/library/system.windows.controls.booleantovisibilityconverter.aspx