MultiBinding转换器，CheckBox.IsChecked不叫 [英] MultiBinding Converter in CheckBox.IsChecked not called

问题描述

我有一个自定义组合框一个multiselectioncombobox如果你愿意，

I have a custom combobox a multiselectioncombobox if you will,

的事情是选择依赖于一个其他集合。我试图ComboBox.IsChecked属性绑定到MultiBinding转换，但转换器不叫。

the thing is the selections depend on an other collection. I tried to bind ComboBox.IsChecked property to MultiBinding Converter but the converter isn't called.

<DataTemplate>
<StackPanel Orientation="Horizontal" x:Name="ItemStack" VirtualizingStackPanel.IsVirtualizing="False">
    <CheckBox x:Name="CheckBoxItem"
        Command="{Binding SelectItem, RelativeSource={RelativeSource AncestorType={x:Type MultiSelectionComboBox}}}"
        CommandParameter="{Binding Key}"
              >
        <CheckBox.IsChecked>
            <MultiBinding Converter="{StaticResource MultiSelectionCommandConverter}" Mode="OneWay">
                <Binding Path="Key"/>
                <Binding Path="SelectedItem"
                         RelativeSource="{RelativeSource AncestorType={x:Type MultiSelectionComboBox}}" />
            </MultiBinding>
        </CheckBox.IsChecked>
    </CheckBox>
    <TextBlock Text="{Binding DisplayText}"></TextBlock>
</StackPanel>
</DataTemplate>

和转换器是

public class MultiSelectionCommandConverter : IMultiValueConverter 
{      
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {   
            ///stuff to do...
    }

    public object[] ConvertBack(object values, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        return null;
    }
}

有什么建议？

推荐答案

尝试各种可能性之后，我发现周围的工作。我依然不明白为什么这可能工作，另一个则不会。

After trying out possibilities, I've found a work around. Still I'm not quite sure why this might work and the other won't.

我已经改变了我的XAML来传递整个对象，而不是财产。因此，code看了很喜欢​​这个，

I've changed my xaml to pass the whole object instead of the property. So the code looked liked this,

<DataTemplate>
<StackPanel Orientation="Horizontal" x:Name="ItemStack" VirtualizingStackPanel.IsVirtualizing="False">
    <CheckBox x:Name="CheckBoxItem"
        Command="{Binding SelectItem, RelativeSource={RelativeSource AncestorType={x:Type MultiSelectionComboBox}}}"
        CommandParameter="{Binding Key}"
              >
        <CheckBox.IsChecked>
            <MultiBinding Converter="{StaticResource MultiSelectionCommandConverter}" Mode="OneWay">
                <Binding Path="Key"/>
                <Binding 
                         RelativeSource="{RelativeSource AncestorType={x:Type MultiSelectionComboBox}}" />
            </MultiBinding>
        </CheckBox.IsChecked>
    </CheckBox>
    <TextBlock Text="{Binding DisplayText}"></TextBlock>
</StackPanel>
</DataTemplate>

和所述转换器是

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
    string key = (string)values[0];
    ObservableCollection<ListItem> selectedItems = (values[1] as MultiSelectionComboBox).SelectedItem;
    //do stuff
    return false;
}

这绝对不是一个期望的解决方案，但是，这会做，直到我找出其他原因。

This is definitely not a desired solution but, this will do until i figure out the other reason.

这篇关于MultiBinding转换器，CheckBox.IsChecked不叫的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！