AcceptRejectRule Enumeración

Definición

Determina la acción que se produce cuando se invoca a los métodos AcceptChanges() o RejectChanges() en un DataTable con un ForeignKeyConstraint.

public enum class AcceptRejectRule
public enum AcceptRejectRule
type AcceptRejectRule = 
Public Enum AcceptRejectRule
Herencia
AcceptRejectRule

Campos

Cascade 1

Los cambios se organizan en cascada a través de la relación.

None 0

No se realiza ninguna acción (valor predeterminado).

Ejemplos

En el ejemplo siguiente se crea un ForeignKeyConstraintobjeto , se establecen varias de sus propiedades, incluido AcceptRejectRule, y se agrega a DataTable ConstraintCollection.

private void CreateConstraint(DataSet dataSet,
    string table1, string table2,string column1, string column2)
{
   // Declare parent column and child column variables.
   DataColumn parentColumn;
   DataColumn childColumn;
   ForeignKeyConstraint foreignKeyConstraint;

   // Set parent and child column variables.
   parentColumn = dataSet.Tables[table1].Columns[column1];
   childColumn = dataSet.Tables[table2].Columns[column2];
   foreignKeyConstraint = new ForeignKeyConstraint
      ("SupplierForeignKeyConstraint",  parentColumn, childColumn);

   // Set null values when a value is deleted.
   foreignKeyConstraint.DeleteRule = Rule.SetNull;
   foreignKeyConstraint.UpdateRule = Rule.Cascade;
   foreignKeyConstraint.AcceptRejectRule = AcceptRejectRule.None;

   // Add the constraint, and set EnforceConstraints to true.
   dataSet.Tables[table1].Constraints.Add(foreignKeyConstraint);
   dataSet.EnforceConstraints = true;
}
Private Sub CreateConstraint(dataSet As DataSet, _
   table1 As String, table2 As String, _
   column1 As String, column2 As String)

   ' Declare parent column and child column variables.
   Dim parentColumn As DataColumn
   Dim childColumn As DataColumn
   Dim foreignKeyConstraint As ForeignKeyConstraint

   ' Set parent and child column variables.
   parentColumn = dataSet.Tables(table1).Columns(column1)
   childColumn = dataSet.Tables(table2).Columns(column2)
   foreignKeyConstraint = New ForeignKeyConstraint _
      ("SupplierForeignKeyConstraint", parentColumn, childColumn)

   ' Set null values when a value is deleted.
   foreignKeyConstraint.DeleteRule = Rule.SetNull
   foreignKeyConstraint.UpdateRule = Rule.Cascade
   foreignKeyConstraint.AcceptRejectRule = AcceptRejectRule.None

   ' Add the constraint, and set EnforceConstraints to true.
   dataSet.Tables(table1).Constraints.Add(foreignKeyConstraint)
   dataSet.EnforceConstraints = True
End Sub

Comentarios

Los cambios en un DataTable no son finales hasta que se llama al AcceptChanges método . Cuando se llama a o AcceptChanges RejectChanges en una fila de la tabla primaria, el AcceptRejectRule valor determina si los cambios se propagan a las filas correspondientes de la tabla secundaria.

Se aplica a

Consulte también