DataGridViewRowEventHandler Delegate
Represents the method that will handle row-related events of a DataGridView.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Public Delegate Sub DataGridViewRowEventHandler ( sender As Object, e As DataGridViewRowEventArgs )
Parameters
- sender
-
Type:
System.Object
The source of the event.
- e
-
Type:
System.Windows.Forms.DataGridViewRowEventArgs
A DataGridViewRowEventArgs that contains the event data.
The DataGridViewRowEventHandler handles the following DataGridView events:
When you create a DataGridViewRowEventHandler 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 uses a DataGridViewRowEventHandler delegate to handle the NewRowNeeded event. This code example is part of a larger example provided in the VirtualMode property reference topic.
Dim newRowNeeded As Boolean
Private Sub dataGridView1_NewRowNeeded(ByVal sender As Object, _
ByVal e As DataGridViewRowEventArgs) _
Handles dataGridView1.NewRowNeeded
newRowNeeded = True
End Sub
Const initialSize As Integer = 5000000
Dim numberOfRows As Integer = initialSize
Private Sub dataGridView1_RowsAdded(ByVal sender As Object, _
ByVal e As DataGridViewRowsAddedEventArgs) _
Handles dataGridView1.RowsAdded
If newRowNeeded Then
newRowNeeded = False
numberOfRows = numberOfRows + 1
End If
End Sub
#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