How to fix System.AccessViolationException?

Question

Hi, I have a simple WinUI application to try MultiBinding. When I run debug the application, it throws error System.AccessViolationException.

As I researched, an AccessViolationException is an exception typically raised when your process tries to access memory that's not its own. But I don't access to any external memory. Here is my code using MultiBinding:

<Window
    x:Class="MultiBindingItem.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:converters="using:MultiBindingItem.Converters"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
    xmlns:local="using:MultiBindingItem"
    xmlns:local1="using:MultiBindingItem.Views"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid.Resources>
            <converters:ArrayCloneConverter x:Key="ArrayCloneConverter" />
        </Grid.Resources>
        <Grid.DataContext>
            <local:MainWindowViewModel />
        </Grid.DataContext>

        <StackPanel Margin="8">
            <TextBox x:Name="FirstNameTextBox" Header="First Name" />

            <ToggleSwitch x:Name="LastNameToggleSwitch" Header="Last Name" />

            <Button Command="{Binding ClickCommand}" Content="My Button">
                <interactivity:Interaction.Behaviors>
                    <local:MultiBindingBehavior
                        Converter="{StaticResource ArrayCloneConverter}"
                        Mode="TwoWay"
                        PropertyName="CommandParameter">
                        <local:MultiBindingItem Value="{Binding Text, ElementName=FirstNameTextBox, Mode=TwoWay}" />
                        <local:MultiBindingItem Value="{Binding IsOn, ElementName=LastNameToggleSwitch, Mode=TwoWay}" />
                    </local:MultiBindingBehavior>
                </interactivity:Interaction.Behaviors>
            </Button>
        </StackPanel>
    </Grid>
</Window>

Answer 1

Hello,

Welcome to Microsoft Q&A!

According to the thread: WinUI Multibinding Support

It seems that Winui3 does not support MultiBinding at this time.

Thank you.

Jeanine

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