DataSet.OnRemoveTable(DataTable) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
protected public:
virtual void OnRemoveTable(System::Data::DataTable ^ table);
protected:
virtual void OnRemoveTable(System::Data::DataTable ^ table);
protected internal virtual void OnRemoveTable (System.Data.DataTable table);
protected 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)
Protected Overridable Sub OnRemoveTable (table As DataTable)
Parameters
Examples
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 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
Remarks
This method can be overridden by subclasses to restrict tables from being removed.
Applies to
See also
Spolupráca s nami v službe GitHub
Zdroj tohto obsahu nájdete v službe GitHub, kde môžete vytvárať a skúmať problémy a žiadosti o prijatie zmien. Ďalšie informácie nájdete v našom sprievodcovi prispievateľom.