Occurs when the label for an item is edited by the user.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The event occurs when the user finishes modifying the text for an item. The new string that the user types for the item is passed to the event, and the event handler can reject the change. If the event handler rejects the change, the text reverts to the text as it was before the user began editing the item.
Because the event takes place before the label edit is committed, calling the ListView.Sort method in a handler for this event will sort the item using the original value.
You can create an event handler for the BeforeLabelEdit event to perform tasks before the user edits the text of an item.
For more information about handling events, see Consuming Events.
The following code example demonstrates how to use the event to restrict a newly edited label to characters in the alphabet. The example uses the ASCIIEncoding class to obtain the ASCII character code of each character of the new label. If the character falls between the ASCII codes that represent numbers, the new label cannot be applied to the item. This example requires that you have created a ListView control on a form and added items to it. The example also requires that you have connected the event to the event handler defined in the example code. In order to use the ASCIIEncoding class, your file must include the System.Text namespace.
Private Sub MyListView_AfterLabelEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.LabelEditEventArgs) Handles listView1.AfterLabelEdit ' Determine if label is changed by checking to see if it is equal to Nothing. If e.Label Is Nothing Then Return End If ' ASCIIEncoding is used to determine if a number character has been entered. Dim AE As New ASCIIEncoding() ' Convert the new label to a character array. Dim temp As Char() = e.Label.ToCharArray() ' Check each character in the new label to determine if it is a number. Dim x As Integer For x = 0 To temp.Length - 1 ' Encode the character from the character array to its ASCII code. Dim bc As Byte() = AE.GetBytes(temp(x).ToString()) ' Determine if the ASCII code is within the valid range of numerical values. If bc(0) > 47 And bc(0) < 58 Then ' Cancel the event and return the lable to its original state. e.CancelEdit = True ' Display a MessageBox alerting the user that numbers are not allowed. MessageBox.Show("The text for the item cannot contain numerical values.") ' Break out of the loop and exit. Return End If Next x End Sub
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.