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Xceed Toolkit Plus for WPF v5.0 Documentation
Xceed.Wpf.DataGrid Assembly / Xceed.Wpf.DataGrid Namespace / DataGridVirtualizingQueryableCollectionViewSource Class
Members Example


In This Topic
    DataGridVirtualizingQueryableCollectionViewSource Class
    In This Topic
    The DataGridVirtualizingQueryableCollectionView class and its XAML proxy, the DataGridVirtualizingQueryableCollectionViewSource class, provide support for IQueryable data sources.
    Syntax
    'Declaration
 
<TypeDescriptionProviderAttribute(MS.Internal.ComponentModel.DependencyObjectProvider)>
<NameScopePropertyAttribute("NameScope", System.Windows.NameScope)>
Public Class DataGridVirtualizingQueryableCollectionViewSource 
   Inherits DataGridVirtualizingCollectionViewSourceBase
     
    'Usage
 
Dim instance As DataGridVirtualizingQueryableCollectionViewSource
    Example
    The following example demonstrates how to bind to a data source that implements IQueryable (LINQ DataContext) and allow items to be edited, deleted, inserted, and refreshed.
    <Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid">
   <Grid.Resources>


     <xcdg:DataGridVirtualizingQueryableCollectionViewSource x:Key="cvs_queryableSource"
                                                             QueryableSource="{Binding Path=QueryableSource}"
                                                             CommitMode="EditCommitted"
                                                             CreatingNewItem="DataGridVirtualizingQueryableCollectionViewSource_CreatingNewItem"
                                                             CommittingNewItem="DataGridVirtualizingQueryableCollectionViewSource_CommittingNewItem"
                                                             CancelingNewItem="DataGridVirtualizingQueryableCollectionViewSource_CancelingNewItem"
                                                             CommitItems="DataGridVirtualizingQueryableCollectionViewSource_CommitItems"
                                                             RemovingItem="DataGridVirtualizingQueryableCollectionViewSource_RemovingItem" />
   </Grid.Resources>

   <xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource cvs_queryableSource}}"
                         ItemScrollingBehavior="Deferred"
                         MaxGroupLevels="2"
                         MaxSortLevels="2"
                         IsDeleteCommandEnabled="True"
                         IsRefreshCommandEnabled="True">
      <xcdg:DataGridControl.Resources>

         <Style TargetType="{x:Type xcdg:Row}"
                x:Key="RowHeightStyle">
            <Setter Property="Height"
                    Value="27" />
         </Style>

         <Style TargetType="{x:Type xcdg:DataRow}"
                BasedOn="{StaticResource RowHeightStyle}" />
         <Style TargetType="{x:Type xcdg:InsertionRow}"
                BasedOn="{StaticResource RowHeightStyle}" />
      </xcdg:DataGridControl.Resources>

      <xcdg:DataGridControl.View>
         <xcdg:TableView>
            <xcdg:TableView.FixedHeaders>
               <DataTemplate>
                  <xcdg:InsertionRow />
               </DataTemplate>
            </xcdg:TableView.FixedHeaders>
         </xcdg:TableView>
      </xcdg:DataGridControl.View>

      <xcdg:DataGridControl.Columns>
         <xcdg:Column FieldName="ProductID"
                      AllowSort="False"
                      AllowGroup="False" />
      </xcdg:DataGridControl.Columns>
   </xcdg:DataGridControl>
</Grid>
    The following code provides the code-behind implementation of the CommitMode, CreatingNewItem, CommittingNewItem, CancelingNewItem, CommitItems, and RemovingItem events. 
    Public Partial Class Window1
                     Inherits Window
  Public Sub New
    Me.DataContext = Me
    InitializeComponent()
  End Sub

  ' QUERYABLE SOURCE
  Public Readonly Property QueryableSource As IQueryable
    Get
      If m_queryable Is Nothing Then
        m_northwind = New NorthwindDataContext()
        m_queryable = m_northwind.Products
      End If
      Return m_queryable
    End Get
  End Property

  Private m_northwind As NorthwindDataContext
  Private m_queryable As IQueryable

  ' QUERYABLE INSERTION SUPPORT
  Private Sub DataGridVirtualizingQueryableCollectionViewSource_CreatingNewItem( sender As Object, e As DataGridCreatingNewItemEventArgs )
    Dim productToInsert As New Product()
    e.NewItem = productToInsert
    m_northwind.Products.InsertOnSubmit( productToInsert )
    e.Handled = True
  End Sub

  Private Sub DataGridVirtualizingQueryableCollectionViewSource_CommittingNewItem( sender As Object, e As DataGridCommittingNewItemEventArgs )
    Try
      m_northwind.SubmitChanges()
    Catch e As Exception
      e.Cancel = True
    End Try
    e.Handled = True
  End Sub

  Private Sub DataGridVirtualizingQueryableCollectionViewSource_CancelingNewItem( sender As Object, e As DataGridItemHandledEventArgs )
    m_northwind.GetChangeSet().Inserts.Clear()
    e.Handled = True
  End Sub

  ' QUERYABLE EDIT SUPPORT
  Private Sub DataGridVirtualizingQueryableCollectionViewSource_CommitItems( sender As Object, e As CommitItemsEventArgs )
    Try
      m_northwind.SubmitChanges()
    Catch e As Exception
      m_northwind.GetChangeSet().Updates.Clear()
    Finally
      e.AsyncCommitInfo.EndCommit()
    End Try
  End Sub

  ' QUERYABLE DELETE SUPPORT
  Private Sub DataGridVirtualizingQueryableCollectionViewSource_RemovingItem( sender As Object, e As DataGridRemovingItemEventArgs )
    Try
      m_northwind.Products.DeleteOnSubmit( TryCast( e.Item, Product ) )
      m_northwind.SubmitChanges()
    Catch e As Exception
      m_northwind.GetChangeSet().Deletes.Clear()
      e.Cancel = True
    End Try
    e.Handled = True
  End Sub
End Class
    The following code provides the code-behind implementation of the CommitMode, CreatingNewItem, CommittingNewItem, CancelingNewItem, CommitItems, and RemovingItem events. 
    public partial class Window1 : Window
{
 public Window1()
 {
   this.DataContext = this;
   InitializeComponent();
 }

 // QUERYABLE SOURCE
 public IQueryable QueryableSource
 {
   get
   {
     if( m_queryable == null )
     {
       m_northwind = new NorthwindDataContext();
       m_queryable = m_northwind.Products;
     }
     return m_queryable;
   }
 }

 private NorthwindDataContext m_northwind;
 private IQueryable m_queryable;

 // QUERYABLE INSERTION SUPPORT
 private void DataGridVirtualizingQueryableCollectionViewSource_CreatingNewItem( object sender, DataGridCreatingNewItemEventArgs e )
 {
   Product productToInsert = new Product();
   e.NewItem = productToInsert;
   m_northwind.Products.InsertOnSubmit( productToInsert );
   e.Handled = true;
 }

 private void DataGridVirtualizingQueryableCollectionViewSource_CommittingNewItem( object sender, DataGridCommittingNewItemEventArgs e )
 {
   try
   {
     m_northwind.SubmitChanges();
   }
   catch
   {
     e.Cancel = true;
   }
   e.Handled = true;
 }

 private void DataGridVirtualizingQueryableCollectionViewSource_CancelingNewItem( object sender, DataGridItemHandledEventArgs e )
 {
   m_northwind.GetChangeSet().Inserts.Clear();
   e.Handled = true;
 }

 // QUERYABLE EDIT SUPPORT
 private void DataGridVirtualizingQueryableCollectionViewSource_CommitItems( object sender, CommitItemsEventArgs e )
 {
   try
   {
     m_northwind.SubmitChanges();
   }
   catch
   {
     m_northwind.GetChangeSet().Updates.Clear();
   }
   finally
   {
     e.AsyncCommitInfo.EndCommit();
   }
 }

 // QUERYABLE DELETE SUPPORT
 private void DataGridVirtualizingQueryableCollectionViewSource_RemovingItem( object sender, DataGridRemovingItemEventArgs e )
 {
   try
   {
     m_northwind.Products.DeleteOnSubmit( e.Item as Product );
     m_northwind.SubmitChanges();
   }
   catch
   {
     m_northwind.GetChangeSet().Deletes.Clear();
     e.Cancel = true;
   }
   e.Handled = true;
 }
}
    Inheritance Hierarchy

    System.Object
       System.Windows.Threading.DispatcherObject
          System.Windows.DependencyObject
             System.Windows.Data.CollectionViewSource
                Xceed.Wpf.DataGrid.DataGridCollectionViewSourceBase
                   Xceed.Wpf.DataGrid.DataGridVirtualizingCollectionViewSourceBase
                      Xceed.Wpf.DataGrid.DataGridVirtualizingQueryableCollectionViewSource

    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also

    Reference

    DataGridVirtualizingQueryableCollectionViewSource Members
    Xceed.Wpf.DataGrid Namespace

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