DataGrid.AllowNavigationChanged Evento

Definizione

Spazio dei nomi:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Si verifica quando la proprietà AllowNavigation viene modificata.

public:
 event EventHandler ^ AllowNavigationChanged;

public event EventHandler AllowNavigationChanged;

member this.AllowNavigationChanged : EventHandler 

Public Custom Event AllowNavigationChanged As EventHandler 

Tipo evento

EventHandler

Esempio

Nell'esempio di codice seguente viene reimpostata la AllowNavigation proprietà e viene generato l'evento AllowNavigationChanged .

private:
   // Create an instance of the 'AllowNavigationChanged' EventHandler.
   void CallAllowNavigationChanged()
   {
      myDataGrid->AllowNavigationChanged += gcnew EventHandler( this, &MyDataGrid::Grid_AllowNavChange );
   }

   // Set the 'AllowNavigation' property on click of a button.
private:
   void myButton_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      if ( myDataGrid->AllowNavigation )
            myDataGrid->AllowNavigation = false;
      else
            myDataGrid->AllowNavigation = true;
   }

   // Raise the event when 'AllowNavigation' property is changed.
private:
   void Grid_AllowNavChange( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      String^ myString = "AllowNavigationChanged event raised, Navigation ";
      bool myBool = myDataGrid->AllowNavigation;

      // Create appropriate alert message.
      myString = String::Concat( myString, myBool ? (String^)" is " : " is not ", "allowed" );

      // Show information about navigation.
      MessageBox::Show( myString, "Navigation information" );
   }

// Create an instance of the 'AllowNavigationChanged' EventHandler.
private void CallAllowNavigationChanged()
{
   myDataGrid.AllowNavigationChanged += 
                                   new EventHandler(Grid_AllowNavChange);
}

// Set the 'AllowNavigation' property on click of a button.
private void myButton_Click(object sender, EventArgs e)
{
   if (myDataGrid.AllowNavigation)
      myDataGrid.AllowNavigation = false;
   else
      myDataGrid.AllowNavigation = true;
}

// Raise the event when 'AllowNavigation' property is changed.
private void Grid_AllowNavChange(object sender, EventArgs e)
{
   string myString = "AllowNavigationChanged event raised, Navigation ";
   bool myBool = myDataGrid.AllowNavigation;
   // Create appropriate alert message.
   myString = myString + (myBool ? " is " : " is not ") + "allowed";
   // Show information about navigation.
   MessageBox.Show(myString, "Navigation information");
}

' Create an instance of the 'AllowNavigationChanged' EventHandler.
Private Sub CallAllowNavigationChanged()
   AddHandler myDataGrid.AllowNavigationChanged, AddressOf Grid_AllowNavChange
End Sub


' Set the 'AllowNavigation' property on click of a button.
 Private Sub myButton_Click(ByVal sender As Object, ByVal e As EventArgs)
     If myDataGrid.AllowNavigation = True Then
         myDataGrid.AllowNavigation = False
     Else
         myDataGrid.AllowNavigation = True
     End If
 End Sub
 
' Raise the event when 'AllowNavigation' property is changed.
 Private Sub Grid_AllowNavChange(ByVal sender As Object, ByVal e As EventArgs)
     Dim myString As String = "AllowNavigationChanged event raised, Navigation "
     Dim myBool As Boolean = myDataGrid.AllowNavigation
     ' Create appropriate alert message.
     myString = myString + IIF(mybool, "is", "is not") + "allowed"
     ' Show information about navigation.
     MessageBox.Show(myString, "Navigation information")
 End Sub

Commenti

Se la AllowNavigation proprietà è impostata su false, non vengono visualizzati collegamenti alle tabelle figlio.