DataGridBoolColumn.NullValue Propriedade
Definição
public:
property System::Object ^ NullValue { System::Object ^ get(); void set(System::Object ^ value); };
[System.ComponentModel.TypeConverter(typeof(System.ComponentModel.StringConverter))]
public object NullValue { get; set; }
[<System.ComponentModel.TypeConverter(typeof(System.ComponentModel.StringConverter))>]
member this.NullValue : obj with get, set
Public Property NullValue As Object
Valor da propriedade
O valor, digitado como Object.The value, typed as Object.
- Atributos
Exemplos
O exemplo de código a seguir define as TrueValue FalseValue Propriedades, e NullValue de um DataGridBoolColumn .The following code example sets the TrueValue, FalseValue, and NullValue properties of a DataGridBoolColumn.
private:
void SetBoolColumnValues()
{
DataGridBoolColumn^ myGridColumn;
// Get the DataGridBoolColumn you are setting.
myGridColumn = dynamic_cast<DataGridBoolColumn^>(myDataGrid->TableStyles[ "Customers" ]->GridColumnStyles[ "Current" ]);
// Set TrueValue, FalseValue, and NullValue.
myGridColumn->TrueValue = true;
myGridColumn->FalseValue = false;
myGridColumn->NullValue = Convert::DBNull;
}
private void SetBoolColumnValues(){
DataGridBoolColumn myGridColumn;
// Get the DataGridBoolColumn you are setting.
myGridColumn = (DataGridBoolColumn) myDataGrid.
TableStyles["Customers"].GridColumnStyles["Current"];
// Set TrueValue, FalseValue, and NullValue.
myGridColumn.TrueValue = true;
myGridColumn.FalseValue = false;
myGridColumn.NullValue = Convert.DBNull;
}
Private Sub SetBoolColumnValues()
Dim myGridColumn As DataGridBoolColumn
' Get the DataGridBoolColumn you are setting.
myGridColumn = CType(myDataGrid.TableStyles _
("Customers").GridColumnStyles("Current"), DataGridBoolColumn)
' Set TrueValue, FalseValue, and NullValue.
myGridColumn.TrueValue = true
myGridColumn.FalseValue = false
myGridColumn.NullValue = Convert.DBNull
End Sub
Comentários
Você também pode especificar qual texto será exibido definindo a NullText propriedade.You can also specify what text will be displayed by setting the NullText property.
A AllowNull propriedade deve ser definida como true para inserir valores nulos.The AllowNull property must be set to true to enter null values.
As FalseValue NullValue Propriedades, e TrueValue determinam os valores reais enviados por push para a fonte de dados.The FalseValue, NullValue, and TrueValue properties determine the actual values pushed into the data source.