WPF: how to pass 2 text properties from 2 TextBoxes into my Button command

Question

So i have 2 TextBox and button with simple command:

    <Button ToolTip="Save" Command="{Binding SaveCommand}"/>   

And i want to pass to this command the 2 Text properties from my 2 TexBox.

In case i want to pass only 1 Text property i used this command:

CommandParameter="{Binding Text, ElementName=yourTextBox}"

Any chance to do that without Converter ?

Answer 1

You can try to create a converter for multiple values by implementing IMultiValueConverter interface:

public class MultiTextConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        //logic to aggregate two texts from object[] values into one object
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        return new[] { Binding.DoNothing };
    }
}

Then use it in xaml. Declare the converter instance in Window or App resources

<ResourceDictionary>                    
    <MultiTextConverter x:Key="multiTextConverter"/>
</ResourceDictionary>

And use in button CommandParameter binding

<Button ToolTip="Save" Command="{Binding SaveCommand}">
   <Button.CommandParameter>
       <MultiBinding Converter="{StaticResource multiTextConverter}">
           <Binding ElementName="yourTextBox1" Path="Text"/>
           <Binding ElementName="yourTextBox2" Path="Text"/>
       </MultiBinding>
   </Button.CommandParameter>
</Button>