wpf Value and Multivalue Converters Use IMultiValueConverter to pass multiple parameters to a Command
Example
It is possible to pass multiple bound values as a CommandParameter using MultiBinding with a very simple IMultiValueConverter:
namespace MyProject.Converters
{
public class Converter_MultipleCommandParameters : MarkupExtension, IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
return values.ToArray();
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
private static Converter_MultipleCommandParameters _converter = null;
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (_converter == null) _converter = new Converter_MultipleCommandParameters();
return _converter;
}
public Converter_MultipleCommandParameters()
: base()
{
}
}
}
Using the converter:
-
Example implementation - method called when
SomeCommandis executed (note:DelegateCommandis an implementation ofICommandthat is not provided in this example):private ICommand _SomeCommand; public ICommand SomeCommand { get { return _SomeCommand ?? (_SomeCommand = new DelegateCommand(a => OnSomeCommand(a))); } } private void OnSomeCommand(object item) { object[] parameters = item as object[]; MessageBox.Show( string.Format("Execute command: {0}\nParameter 1: {1}\nParamter 2: {2}\nParamter 3: {3}", "SomeCommand", parameters[0], parameters[1], parameters[2])); } -
Define namespace
xmlns:converters="clr-namespace:MyProject.Converters;assembly=MyProject"
-
Example use of this converter in binding
<Button Width="150" Height="23" Content="Execute some command" Name="btnTestSomeCommand" Command="{Binding Path=SomeCommand}" > <Button.CommandParameter> <MultiBinding Converter="{converters:Converter_MultipleCommandParameters}"> <Binding RelativeSource="{RelativeSource Self}" Path="IsFocused"/> <Binding RelativeSource="{RelativeSource Self}" Path="Name"/> <Binding RelativeSource="{RelativeSource Self}" Path="ActualWidth"/> </MultiBinding> </Button.CommandParameter> </Button>
