Xceed DataGrid for WPF v7.2 Documentation
Manually handling the insertion process

The following example demonstrates how to manually handle the insertion process of a new item into a collection.

XAML
Copy Code 
<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"

     xmlns:local="clr-namespace:Xceed.Wpf.Documentation">

  <Grid.Resources>

    <xcdg:DataGridCollectionViewSource x:Key="cvs_persons"

                                       Source="{Binding Source={x:Static Application.Current},

                                                        Path=PersonList}"

                                       CreatingNewItem="CollectionView_CreatingNewItem"

                                       CommittingNewItem="CollectionView_CommittingNewItem"

                                       CancelingNewItem="CollectionView_CancelingNewItem"/>

  </Grid.Resources>

  <xcdg:DataGridControl x:Name="PersonsGrid"

                        ItemsSource="{Binding Source={StaticResource cvs_persons}}">

     <xcdg:DataGridControl.View>

        <xcdg:TableView>

           <xcdg:TableView.FixedHeaders>

              <DataTemplate>

                 <xcdg:InsertionRow/>

              </DataTemplate>

           </xcdg:TableView.FixedHeaders>

        </xcdg:TableView>

     </xcdg:DataGridControl.View>

  </xcdg:DataGridControl>

</Grid>

The following code provides the implementation of the CreatingNewItem, CommittingNewItem, and CancelingNewItem events.

VB.NET
Copy Code 
Private Sub CollectionView_CreatingNewItem( ByVal sender As Object, _

                                            ByVal e As DataGridCreatingNewItemEventArgs )

  e.NewItem = New Person( Person.AutoIncrementID, String.Empty, String.Empty, -1 )

  e.Handled = True

End Sub

Private Sub CollectionView_CommittingNewItem( ByVal sender As Object, _

                                              ByVal e As DataGridCommittingNewItemEventArgs )

  Dim source As List( Of Person ) = CType( e.CollectionView.SourceCollection, List( Of Person ) )

  source.Add( CType( e.Item, Person ) )

  Person.AutoIncrementID = Person.AutoIncrementID + 1

  ' the new item is always added at the end of the list.

  e.Index = source.Count - 1

  e.NewCount = source.Count

  e.Handled = True

End Sub

Private Sub CollectionView_CancelingNewItem( ByVal sender As Object, _

                                             ByVal e As DataGridItemHandledEventArgs )

  ' Manually handling the insertion of new items requires that the CreatingNewItem,

  ' CommitingNewItem, and CancelingNewItem events must all be handled even if nothing

  ' is done in the event.

  e.Handled = True

End Sub
C#
Copy Code 
private void CollectionView_CreatingNewItem( object sender, DataGridCreatingNewItemEventArgs e )

{

 e.NewItem = new Person( Person.AutoIncrementID, string.Empty, string.Empty, -1 );

 e.Handled = true;

}

private void CollectionView_CommittingNewItem( object sender, DataGridCommittingNewItemEventArgs e )

{

 List<Person> source = e.CollectionView.SourceCollection as List<Person>;

 source.Add( ( Person )e.Item );

 Person.AutoIncrementID = Person.AutoIncrementID + 1;

 // the new item is always added at the end of the list.     

 e.Index = source.Count - 1;

 e.NewCount = source.Count;

 e.Handled = true;

}

private void CollectionView_CancelingNewItem( object sender, DataGridItemHandledEventArgs e )

{

 // Manually handling the insertion of new items requires that the CreatingNewItem,

 // CommitingNewItem, and CancelingNewItem events must all be handled even if nothing

 // is done in the event.

 e.Handled = true;

}

 

 

Copyright Xceed Software Inc

Send Feedback