DataTable.RowDeleting DataTable.RowDeleting DataTable.RowDeleting DataTable.RowDeleting Event

Definizione

Viene generato prima dell'eliminazione di una riga nella tabella.Occurs before a row in the table is about to be deleted.

public:
 event System::Data::DataRowChangeEventHandler ^ RowDeleting;
[System.Data.DataSysDescription("DataTableRowDeletingDescr")]
public event System.Data.DataRowChangeEventHandler RowDeleting;
member this.RowDeleting : System.Data.DataRowChangeEventHandler 
Public Custom Event RowDeleting As DataRowChangeEventHandler 
Attributi

Esempi

private static void DataTableRowDeleting()
{
    DataTable customerTable = new DataTable("Customers");
    // add columns
    customerTable.Columns.Add( "id", typeof(int));
    customerTable.Columns.Add( "name", typeof(string));
    customerTable.Columns.Add( "address", typeof(string));

    // set PrimaryKey
    customerTable.Columns[ "id" ].Unique = true;
    customerTable.PrimaryKey = new DataColumn[] 
        { customerTable.Columns["id"] };

    // add a RowDeleting event handler for the table.
    customerTable.RowDeleting += new DataRowChangeEventHandler( Row_Deleting );


    // add ten rows
    for( int id=1; id<=10; id++)
    {
        customerTable.Rows.Add( 
            new object[] { id, string.Format("customer{0}", id), 
            string.Format("address{0}", id) });
    }

    customerTable.AcceptChanges();

    // Delete all the rows
    foreach( DataRow row in customerTable.Rows )
        row.Delete();
}

private static void Row_Deleting( object sender, 
    DataRowChangeEventArgs e )
{
    Console.WriteLine( "Row_Deleting Event: name={0}; action={1}", 
        e.Row["name"], e.Action );
}
Private Shared Sub DataTableRowDeleting()
	Dim customerTable As DataTable = New DataTable("Customers")
	' add columns
	customerTable.Columns.Add( "id", Type.GetType("System.Int32"))
	customerTable.Columns.Add( "name", Type.GetType("System.String"))
	customerTable.Columns.Add( "address", Type.GetType("System.String"))

	' set PrimaryKey
	customerTable.Columns( "id").Unique = true
	customerTable.PrimaryKey = New DataColumn() { customerTable.Columns("id") }

	' add a RowDeleting event handler for the table.
	AddHandler customerTable.RowDeleting, New _
        DataRowChangeEventHandler( AddressOf Row_Deleting )


	' add ten rows
	Dim id As Integer
	For id = 1 To 10
		customerTable.Rows.Add( _
			New Object() { id, string.Format("customer{0}", id), _
            string.Format("address{0}", id) })
	Next
	
	customerTable.AcceptChanges()

	' Delete all the rows
	Dim row As DataRow
	For Each row In customerTable.Rows 
		row.Delete()
	Next
End Sub

Private Shared Sub Row_Deleting(sender As Object, _
    e As DataRowChangeEventArgs)
	Console.WriteLine( "Row_Deleting Event: name={0}; action={1}", _
		e.Row("name"), e.Action) 
End Sub

Commenti

Per altre informazioni, vedere gestione degli eventi di DataTable.For more information, see Handling DataTable Events.

Si applica a

Vedi anche