DataGridBoolColumn.EnterNullValue 方法
定义
protected public:
override void EnterNullValue();
protected internal override void EnterNullValue ();
override this.EnterNullValue : unit -> unit
Protected Friend Overrides Sub EnterNullValue ()
例外
示例
下面的代码示例使用在 EnterNullValue 列中输入空值。The following code example uses the EnterNullValue to enter a null value into the column.
private:
void EnterNull()
{
// Creates an instance of a class derived from DataGridBoolColumn.
MyDataGridBoolColumn^ colBool;
colBool = dynamic_cast<MyDataGridBoolColumn^>(dataGrid1->TableStyles[ 0 ]->GridColumnStyles[ 2 ]);
colBool->CallEnterNullValue();
}
internal:
// Class derived from DataGridBoolColumn.
ref class MyDataGridBoolColumn: public DataGridBoolColumn
{
public:
void CallEnterNullValue()
{
this->EnterNullValue();
}
};
private void EnterNull() {
// Creates an instance of a class derived from DataGridBoolColumn.
MyDataGridBoolColumn colBool;
colBool = (MyDataGridBoolColumn)dataGrid1.TableStyles[0].GridColumnStyles[2];
colBool.CallEnterNullValue();
}
// Class derived from DataGridBoolColumn.
internal class MyDataGridBoolColumn : DataGridBoolColumn {
public void CallEnterNullValue() {
this.EnterNullValue();
}
}
Private Sub EnterNull()
' Creates an instance of a class derived from DataGridBoolColumn.
Dim colBool As MyDataGridBoolColumn
colBool = CType(dataGrid1.TableStyles(0).GridColumnStyles(2), MyDataGridBoolColumn)
colBool.CallEnterNullValue()
End Sub
' Class derived from DataGridBoolColumn.
Friend Class MyDataGridBoolColumn
Inherits DataGridBoolColumn
Public Sub CallEnterNullValue()
Me.EnterNullValue()
End Sub
End Class
注解
若要设置在输入空值时使用的实际值,请使用 NullValue 属性。To set the actual value used when entering a null value, use the NullValue property.