How to pass Multiple parameters as CommandParameter in InvokeCommandAction In WPF App Using MVVM

Question

I am using System.Windows.interactivity.dll to get mouse events in my ViewModel in the following manner.

Answer 1

I Agree with Aghilas. That's how it's done. I improved upon Aghilas's code to clarify what was missing. note that "i:InvokeCommandAction.CommandParameter" must be put inside the invokeCommandAction declaration.

    <ListBox x:Name="listBox" ItemsSource="{Binding HeaderList}" DisplayMemberPath="Text" Width="Auto"   Margin="0,0,0,300" Height="Auto"  >
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseLeftButtonUp">
                <i:InvokeCommandAction Command="{Binding MouseLeftButtonUpCommand}">
                    <i:InvokeCommandAction.CommandParameter>
                        <MultiBinding Converter="{StaticResource XAMLResourceAddConverter}">
                            <Binding ElementName="listBox" Path="SelectedItem"/>
                            <Binding ElementName="listBox" Path="SelectedItem"/>
                        </MultiBinding>
                    </i:InvokeCommandAction.CommandParameter>
                </i:InvokeCommandAction>
            </i:EventTrigger>

        </i:Interaction.Triggers>
    </ListBox>

Answer 2

You can try with custom Converter and MultiBinding

<CommandParameter>
      <MultiBinding Converter="{StaticResource CustomConverter}">
       <Binding ElementName=".." Path=".."/>
       <Binding ElementName=".." Path=".."/>
      </MultiBinding>
</CommandParameter>

Converter

class CustomConverter : IMultiValueConverter 
{
    public object Convert (object[] Values, Type Target_Type, object Parameter, CultureInfo culture) 
    {
        var findCommandParameters = new FindCommandParameters();
        findCommandParameters.Property1 = (string)values[0];
        findCommandParameters.Property1 = (string)values[1];
        return findCommandParameters;
    }
    public object[] ConvertBack(object value, Type[] targetTypes, object parameter,   System.Globalization.CultureInfo culture)
    {
       throw new NotImplementedException();
    }
}

Parameters

public class FindCommandParameters
{
  public string Property1 { get; set; }
  public string Property2 { get; set; }
}