将值和货币绑定到DataGridTextColumn

Question

I would like to bind currency for text column and if i type the value like "de" it is working and i can see Euro. But if I try to bind it it's sending an error.

Ofc i can bind the currency to whole View, but i have always 2 different currencies to display.

There is code that is not working:

Binding="{Binding Income,StringFormat=C,ConverterCulture={Binding CultureFormat}}" />

and If i do like this it's working properly:

<DataGridTextColumn Header="Saldo" Binding="{Binding Balance,StringFormat=C,ConverterCulture=de}" />

I found that the is some solution to use multibinding, but i don't know how in this example.

Answer 1

Here is how you could to this using a multi binding and a converter:

public class CultureConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if(values[0] != DependencyProperty.UnsetValue && values[1] != DependencyProperty.UnsetValue)
        {
            decimal balance = System.Convert.ToDecimal(values[0]);
            string c = values[1] as string;

            return balance.ToString("C", CultureInfo.GetCultureInfo(c));
        }

        return Binding.DoNothing;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

XAML:

<DataGrid ...>
    <DataGrid.Resources>
        <local:CultureConverter x:Key="conv" />
    </DataGrid.Resources>
    <DataGrid.Columns>
        <DataGridTextColumn Header="Saldo">
            <DataGridTextColumn.Binding>
                <MultiBinding Converter="{StaticResource conv}">
                    <Binding Path="Income" />
                    <Binding Path="CultureFormat" />
                </MultiBinding>
            </DataGridTextColumn.Binding>
        </DataGridTextColumn>
       ...
    </DataGrid.Columns>
</DataGrid>

The example assumes that the CultureFormat property returns a string. If it returns a CultureInfo you could just cast values[1] to this type instead of string .

Answer 2

Binding is not a dependecy object and its properties are not dependency one. To apply a binding to Binding.ConverterCulture the source should be a dependency property and I guess that CultureFormat is not.

If you need a variable culture info, you can format your data in the ViewModel using a specific property, something like

public string BalanceString
{
    get { return String.Format(CultureFormat, "C", Balance); }
}

and then use this new property for binding:

<DataGridTextColumn Header="Saldo" Binding="{Binding BalanceString, Mode=OneWay}" />