Xceed DataGrid for WPF v7.3 Documentation
Xceed.Wpf.DataGrid Assembly / Xceed.Wpf.DataGrid Namespace / DataGridVirtualizingCollectionView Class / QueryItemCount Event


In This Topic
    QueryItemCount Event (DataGridVirtualizingCollectionView)
    In This Topic
    Raised every time the grid is loaded or refreshed or its state changes (e.g., new sorting or filtering criteria are applied), the total number of records in the underlying data source must be provided, taking into account any filters that are currently applied to the items. This event must be handled.
    Syntax
    'Declaration
     
    Public Event QueryItemCount As EventHandler(Of QueryItemCountEventArgs)
    'Usage
     
    Dim instance As DataGridVirtualizingCollectionView
    Dim handler As EventHandler(Of QueryItemCountEventArgs)
     
    AddHandler instance.QueryItemCount, handler
    public event EventHandler<QueryItemCountEventArgs> QueryItemCount
    Event Data

    The event handler receives an argument of type QueryItemCountEventArgs containing data related to this event. The following QueryItemCountEventArgs properties provide information specific to this event.

    PropertyDescription
    Gets an AsyncQueryInfo that provides the information necessary to retrieve the next batch of items.  
    Gets the DataGridVirtualizingCollectionView to which the grid is bound.  

    Gets a read only collection of DataGridGroupInfo objects, which provide information on the parent groups.

     
    true if the event is asynchronous, otherwise false. By default, false. (Inherited from Xceed.Wpf.DataGrid.AsyncQueryEventArgs)
    Remarks
    The GroupPath allows us to target a specific group. The elements returned are all those found in the data source, once filters are applied (GroupPath is empty), or only those contained under the specified group (GroupPath isn't empty).
    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