DataSet.OnRemoveTable-Methode
Tritt beim Entfernen einer DataTable aus einem DataSet ein.
Namespace: System.Data
Assembly: System.Data (in system.data.dll)
Syntax
'Declaration
Protected Friend Overridable Sub OnRemoveTable ( _
table As DataTable _
)
'Usage
Dim table As DataTable
Me.OnRemoveTable(table)
protected internal virtual void OnRemoveTable (
DataTable table
)
protected public:
virtual void OnRemoveTable (
DataTable^ table
)
protected void OnRemoveTable (
DataTable table
)
protected internal function OnRemoveTable (
table : DataTable
)
Parameter
- table
Die DataTable, die entfernt wird.
Hinweise
Diese Methode kann von untergeordneten Klassen überschrieben werden, um das Entfernen von Tabellen einzuschränken.
Beispiel
Das folgende Beispiel zeigt eine vom DataSet abgeleitete Klasse, wobei die OnRemoveTable-Methode überschrieben wird.
Public Shared Sub DemonstrateOnRemoveTable()
Dim dataSet As DerivedDataSet = CreateDataSet()
If dataSet.Tables.Count > 0 Then dataSet.Tables.RemoveAt(0)
End Sub
Public Class DerivedDataSet
Inherits DataSet
Protected Overrides Sub OnRemoveTable(table As DataTable)
Console.WriteLine( _
"The '{0}' DataTable has been removed from the DataSet", _
table.TableName)
End Sub
End Class
Public Shared Function CreateDataSet() As DerivedDataSet
' Create a DataSet with one table containing two columns.
Dim derived As DerivedDataSet = New DerivedDataSet()
' Add table to DataSet.
Dim table As DataTable = derived.Tables.Add("Items")
' Add two columns.
Dim column As DataColumn = table.Columns.Add("id", _
Type.GetType("System.Int32"))
column.AutoIncrement = True
table.Columns.Add("item", Type.GetType("System.Int32"))
' Set primary key.
table.PrimaryKey = New DataColumn() {table.Columns("id")}
return derived
End Function
public static void DemonstrateOnRemoveTable()
{
DerivedDataSet dataSet = CreateDataSet();
if(dataSet.Tables.Count > 0)
dataSet.Tables.RemoveAt(0);
}
public class DerivedDataSet: DataSet
{
protected override void OnRemoveTable(DataTable table)
{
Console.WriteLine(
"The '{0}' DataTable has been removed from the DataSet",
table.TableName);
}
}
public static DerivedDataSet CreateDataSet()
{
// Create a DataSet with one table containing two columns.
DerivedDataSet derived = new DerivedDataSet();
// Add table to DataSet.
DataTable table = derived.Tables.Add("Items");
// Add two columns.
DataColumn column = table.Columns.Add("id", typeof(int));
column.AutoIncrement = true;
table.Columns.Add("item", typeof(int));
// Set primary key.
table.PrimaryKey = new DataColumn[] {table.Columns["id"]};
return derived;
}
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0
Siehe auch
Referenz
DataSet-Klasse
DataSet-Member
System.Data-Namespace