DataGridViewCellValueEventHandler Delegate
Represents the method that will handle the CellValueNeeded event or CellValuePushed event of a DataGridView.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Public Delegate Sub DataGridViewCellValueEventHandler ( sender As Object, e As DataGridViewCellValueEventArgs )
Parameters
- sender
-
Type:
System.Object
The source of the event.
- e
-
Type:
System.Windows.Forms.DataGridViewCellValueEventArgs
A DataGridViewCellValueEventArgs that contains the event data.
Use this delegate to implement virtual mode in the DataGridView control. For more information about virtual mode, see Virtual Mode in the Windows Forms DataGridView Control.
When you create a DataGridViewCellValueEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see NIB: Events and Delegates.
The following code example handles the CellValuePushed event to store updates and new entries in a data store object. This example is part of a larger example available in the DataGridView.VirtualMode reference topic.
#Region "data store maintance" Const initialValue As Integer = -1 Private Sub dataGridView1_CellValueNeeded(ByVal sender As Object, _ ByVal e As DataGridViewCellValueEventArgs) _ Handles dataGridView1.CellValueNeeded If store.ContainsKey(e.RowIndex) Then ' Use the store if the e value has been modified ' and stored. e.Value = store(e.RowIndex) ElseIf newRowNeeded AndAlso e.RowIndex = numberOfRows Then If dataGridView1.IsCurrentCellInEditMode Then e.Value = initialValue Else ' Show a blank value if the cursor is just resting ' on the last row. e.Value = String.Empty End If Else e.Value = e.RowIndex End If End Sub Private Sub dataGridView1_CellValuePushed(ByVal sender As Object, _ ByVal e As DataGridViewCellValueEventArgs) _ Handles dataGridView1.CellValuePushed store.Add(e.RowIndex, CInt(e.Value)) End Sub #End Region Dim store As System.Collections.Generic.Dictionary(Of Integer, Integer) = _ New Dictionary(Of Integer, Integer)
Available since 2.0