# C1.WPF.FlexGrid.C1FlexGrid.GroupHeaderConverter ## Content

GroupHeaderConverter Property

GroupHeaderConverter

Gets or sets the IValueConverter used to create the content shown in GroupRow cells to summarize group information.

Declaration

public IValueConverter GroupHeaderConverter { get; set; }

Public Property GroupHeaderConverter As IValueConverter

Remarks

<p>By default, the grid creates group headers that show the name of the property being

grouped on, the value of the property, and the number of items in the group.

You can modify or customize this information by defining your own group header converter class and assigning an instance of this class to the grid's GroupHeaderConverter property.

Examples

The example below shows the default group header converter class implementation.

class GroupHeaderConverter : IValueConverter
{
  public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  {
    var gr = parameter as GroupRow;
    var group = gr.Group;
    if (group != null && gr != null && targetType == typeof(string))
    {
      var desc = gr.Grid.CollectionView.GroupDescriptions[gr.Level] as PropertyGroupDescription;
      return desc != null
        ? string.Format("{0}: {1} ({2:n0} item{3})", 
            desc.PropertyName, 
            group.Name, 
            group.ItemCount, 
            group.ItemCount == 1 ? string.Empty : "s")
        : string.Format("{0} ({1:n0} items)", group.Name, group.ItemCount);
    }

    // default
    return value;
  }
  public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  {
    return value;
  }
}