Issue with binding in DataGrid GoupStyle

Question

I am displaying jobs. Jobs got states like this:

public enum JobState

{

    Done,

    Running,

    Overdue,

    Disabled

}

When displaying the jobs in my

DataGrid

I group them by

State

, which is working as expected.

I followed this example. The problem is that I would like to add a header with the

Name

of the

State

to each grouping section.

Im just not sure what exactly is the

DataContext

of the

GroupItem

.

Maybe a

RelativeSource

helps ? - I was not able to make it ... any recommendations ?

<DataGrid ItemsSource="{Binding Path=JobCollectionView}" [..]>

    <DataGrid.GroupStyle>

        <GroupStyle>

           <GroupStyle.HeaderTemplate>

               <DataTemplate>

                  <TextBlock Text="{Binding Path=State}" />

               </DataTemplate>

            </GroupStyle.HeaderTemplate>                   

            <GroupStyle.ContainerStyle>

                <Style TargetType="{x:Type GroupItem}">

                   <Setter Property="Template">

                      <Setter.Value>

                         <ControlTemplate TargetType="{x:Type GroupItem}">

                             <Expander IsExpanded="True">

                                  <Expander.Header>

                                     <StackPanel Orientation="Horizontal">

                    //Error is here:     <TextBlock Text="{Binding Path=StateDescription}" />

                                         <TextBlock Text="{Binding Path=ItemCount}"/>

                                         <TextBlock Text=" Jobs"/>

                                                </StackPanel>

                                       </Expander.Header>

                                     <ItemsPresenter />

                                  </Expander>

                               </ControlTemplate>

                            </Setter.Value>

                        </Setter>

                     </Style>

             </GroupStyle.ContainerStyle>

     </GroupStyle>

 </DataGrid.GroupStyle>

Answer 1

The DataContext of GroupItem is internal class named CollectionViewGroupInternal. You already know that number of items is represented by ItemCount on that class. The rest of the puzzle - name of group is represented by Name property :) Since that is just enum in your case - you can bind directly to that Name property (it contains an instance of your JobState enum).

Issue with binding in DataGrid GoupStyle

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