DataColumnCollection.CollectionChanged Event
Definition
Occurs when the columns collection changes, either by adding or removing a column.
public:
event System::ComponentModel::CollectionChangeEventHandler ^ CollectionChanged;
public event System.ComponentModel.CollectionChangeEventHandler? CollectionChanged;
public event System.ComponentModel.CollectionChangeEventHandler CollectionChanged;
member this.CollectionChanged : System.ComponentModel.CollectionChangeEventHandler
Public Custom Event CollectionChanged As CollectionChangeEventHandler
Event Type
Examples
The following example adds an event handler for the CollectionChanged event.
private void AddEventHandler(DataTable table)
{
DataColumnCollection columns = table.Columns;
columns.CollectionChanged += new
System.ComponentModel.CollectionChangeEventHandler(
ColumnsCollection_Changed);
}
private void ColumnsCollection_Changed(object sender,
System.ComponentModel.CollectionChangeEventArgs e)
{
DataColumnCollection columns =
(DataColumnCollection) sender;
Console.WriteLine("ColumnsCollectionChanged: "
+ columns.Count);
}
Private Sub AddEventHandler(table As DataTable)
Dim columns As DataColumnCollection = table.Columns
AddHandler columns.CollectionChanged, _
AddressOf ColumnsCollection_Changed
End Sub
Private Sub ColumnsCollection_Changed _
(sender As Object, e As System.ComponentModel. _
CollectionChangeEventArgs)
Dim columns As DataColumnCollection = _
CType(sender, DataColumnCollection)
Console.WriteLine("ColumnsCollectionChanged: " _
& columns.Count.ToString())
End Sub
Remarks
Use the Contains and CanRemove methods to determine whether a column exists and can be removed.