DataSet.OnRemoveTable(DataTable) DataSet.OnRemoveTable(DataTable) DataSet.OnRemoveTable(DataTable) DataSet.OnRemoveTable(DataTable) Method

Definition

Tritt beim Entfernen einer DataTable aus einem DataSet ein.Occurs when a DataTable is removed from a DataSet.

protected public:
 virtual void OnRemoveTable(System::Data::DataTable ^ table);
protected internal virtual void OnRemoveTable (System.Data.DataTable table);
abstract member OnRemoveTable : System.Data.DataTable -> unit
override this.OnRemoveTable : System.Data.DataTable -> unit
Protected Friend Overridable Sub OnRemoveTable (table As DataTable)

Parameter

table
DataTable DataTable DataTable DataTable

Die DataTable, die entfernt wird.The DataTable being removed.

Beispiele

Das folgende Beispiel zeigt eine von abgeleitete Klasse die DataSet mit der OnRemoveTable Methode außer Kraft gesetzt.The following example shows a class derived from the DataSet with the OnRemoveTable method overridden.


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;
}

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

Hinweise

Diese Methode kann überschrieben werden, von Unterklassen zu verhindern, dass Tabellen entfernt werden.This method can be overridden by subclasses to restrict tables from being removed.

Gilt für:

Siehe auch