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Passing incorrect values into MultiValueConverter by MultiBinding


Passing incorrect values into MultiValueConverter by MultiBinding

By : user3100133
Date : January 12 2021, 01:40 AM
will be helpful for those in need I managed to fix this by explicitly setting DataContext on the RadioButton and removing the RelativeSources within the MultiBinding. Though I don't understand why it did not work with the RelativeSources, it works. Here is the code, in case of anyone reading this in the future:
code :
<RadioButton x:Name="RadioButton" ToolTipService.ShowOnDisabled="True" 
                     DataContext="{Binding ViewModel, RelativeSource={RelativeSource AncestorType={x:Type local:MainWindow}}}"
            IsEnabled="{Binding IsRadioButtonEnabled}" VerticalAlignment="Center" HorizontalAlignment="Center" Content="Radio">
            <RadioButton.ToolTip>
                <ToolTip>
                    <TextBlock>
                        <TextBlock.Text>
                            <MultiBinding Converter="{StaticResource BooleanToStringConverter}">
                                <Binding Path="IsRadioButtonEnabled"/>
                                <Binding Path="EnabledToolTip"/>
                                <Binding Path="DisabledToolTip"/>
                            </MultiBinding>
                        </TextBlock.Text>
                    </TextBlock>
                </ToolTip>
            </RadioButton.ToolTip>
        </RadioButton>


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MultiBinding with MultiValueConverter does not update

MultiBinding with MultiValueConverter does not update


By : user2929903
Date : March 29 2020, 07:55 AM
To fix this issue I think the following might cause this: If you bind directly to the Entries the ListView will listen to CollectionChanged events, but if such a binding is inside a MultiBinding the only thing that would cause a reevaluation could be a PropertyChanged notification, which might not exist for the Entries property in your model.
Maybe you can subscribe to the CollectionChanged event of your collection and raise a PropertyChanged event or get the BindingExpression within your MultiBinding to call an update manually.
WPF 3.5: MultiValueConverter Values are NamedObjects Where Single ValueConverters Work as per Normal

WPF 3.5: MultiValueConverter Values are NamedObjects Where Single ValueConverters Work as per Normal


By : user247432
Date : March 29 2020, 07:55 AM
around this issue Worked it out, to an extent at least. You need to be more robust with your multibinding converter (InfoSectionIsEnabled).
In my case, my converter was as follows:
code :
Public Function Convert(values() As Object,
                        targetType As System.Type,
                        parameter As Object,
                        culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IMultiValueConverter.Convert
    If values IsNot Nothing Then
        Return values.All(Function(n) CBool(n))
    End If
    Return False
End Function
Public Function Convert(values() As Object,
                        targetType As System.Type,
                        parameter As Object,
                        culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IMultiValueConverter.Convert
    If values IsNot Nothing AndAlso values.All(Function(n) TypeOf n Is Boolean) Then
        Return values.All(Function(n) CBool(n))
    End If
    Return False
End Function
Multibinding generates "Cannot set MultiBinding because MultiValueConverter must be specified"

Multibinding generates "Cannot set MultiBinding because MultiValueConverter must be specified"


By : padma
Date : March 29 2020, 07:55 AM
To fix this issue I have a button with binding which works fine, see below: , you have to implement IMultiConverter
code :
public class SearchFilterConverter : IMultiValueConverter
{
 public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
 {
    return new Tuple<String, bool>((String)values[0], (bool)values[1]);;
 }
 public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}
 <Converter:SearchFilterConverter x:Key="searchFilterConverter" />
<Button x:Name="licenceFilterSet" Content="Search" Command="{Binding licenseSearchCommand}">
<Button.CommandParameter>
    <MultiBinding Converter="{StaticResource searchFilterConverter}">
        <Binding Path="Text" ElementName="licenseTextBox" />
        <Binding Path="IsEnabled" ElementName="regularExpressionCheckBox" />
    </MultiBinding>
</Button.CommandParameter>
</Button>
Cannot set multibinding because multivalueconverter must be specified WPF

Cannot set multibinding because multivalueconverter must be specified WPF


By : Andy Brunner
Date : March 29 2020, 07:55 AM
may help you . Seems to be incorrect reference only. And there are changes in the converter. Array is having Count() method. Might be you used system.linq. Just change the wpfApplication1 with your namespace
code :
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            //WindowState = WindowState.Maximized;
            InitializeComponent();
        }
    }
    public class ScrollOffsetToVisibilityConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values == null)
                throw new ArgumentException("Values cannot be null.");
            if (values.Length != 2)
                throw new ArgumentException("Incorrect number of bindings (" + values.Length + ")");
            if (parameter == null)
                throw new ArgumentException("Parameter cannot be null.");

            var top = parameter.ToString().ToUpper() == "TOP";

            var offset = Double.Parse(values[0].ToString());
            var maxHeight = Double.Parse(values[1].ToString());

            return (top && offset == 0) || (!top && offset == maxHeight) ? Visibility.Visible : Visibility.Collapsed;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}
<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        xmlns:local="clr-namespace:WpfApplication1" >
    <Window.Resources>
        <local:ScrollOffsetToVisibilityConverter x:Name="ConverterName"  x:Key="Converter"/>
    </Window.Resources>
    <Grid>
        <TextBox Text="Hi"/>
    </Grid>
</Window>
WPF: Is there a way to get original values in ConvertBack method of MultiValueConverter?

WPF: Is there a way to get original values in ConvertBack method of MultiValueConverter?


By : user3844263
Date : March 29 2020, 07:55 AM
wish helps you I know this is an old issue, but this solution might help someone else.
Instead of using the the ConvertBack method of the IMultiValueConverter, you can set the IsChecked binding to be OneWay and use the CheckBox Command property to perform the check logic.
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