Add multiple DataBindings to Winforms label

c#, data-binding, winforms

Solution

You'll need to use a `MultiBinding`. Add the two `Binding` instances (one for `countryRegion` and one for `country`. Then you'll need to implement an `IMultiValueConverter` that will accept the values produced by the two binding objects and convert them into a single value.

The binding setup would look something like this:

var multiBinding = new MultiBinding();
multiBinding.Bindings.Add(new Binding("Text", this.bev_BindingSource, "countryRegion", true));
multiBinding.Bindings.Add(new Binding("Text", this.bev_BindingSource, "country", true));
multiBinding.Converter = new MyMultiValueConverter();

this.label9.DataBindings.Add(multiBinding);

And the converter implementation would look something like:

public class MyMultiValueConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        // perform your conversion here and return the final value
    }

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

Problem

I am displaying different values in a `Label` control from a `BindingSource` that is bound to a `DataGridView` depending on which row is selected. Right now, the label has a databinding that looks as follows: ``` this.label9.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.bev_BindingSource, "countryRegion", true)); ``` which successfully displays the value of the `countryRegion` column. Is is possible to set the databinding as a concatenated result from two columns, in this case `countryRegion` and `country`?

Original source