Form.CancelButton Form.CancelButton Form.CancelButton Form.CancelButton Property

Definition

Ruft das Button-Steuerelement ab, das beim Drücken von ESC betätigt wird, oder legt dieses fest.Gets or sets the button control that is clicked when the user presses the ESC key.

public:
 property System::Windows::Forms::IButtonControl ^ CancelButton { System::Windows::Forms::IButtonControl ^ get(); void set(System::Windows::Forms::IButtonControl ^ value); };
public System.Windows.Forms.IButtonControl CancelButton { get; set; }
member this.CancelButton : System.Windows.Forms.IButtonControl with get, set
Public Property CancelButton As IButtonControl

Eigenschaftswert

Ein IButtonControl, das die Schaltfläche zum Abbrechen für das Formular darstellt.An IButtonControl that represents the cancel button for the form.

Beispiele

Im folgenden Beispiel wird eine neue Instanz von Form erstellt und die ShowDialog -Methode aufgerufen, um das Formular als Dialogfeld anzuzeigen.The following example creates a new instance of a Form and calls the ShowDialog method to display the form as a dialog box. Im Beispiel werden die FormBorderStyleEigenschaften AcceptButton, CancelButton, MinimizeBox, MaximizeBox, undStartPosition festgelegt, um die Darstellung und die Funktionalität des Formulars in ein Dialogfeld zu ändern.The example sets the FormBorderStyle, AcceptButton, CancelButton, MinimizeBox, MaximizeBox, and StartPosition properties to change the appearance and functionality of the form to a dialog box. Im Beispiel wird auch die Add -Methode der- Controls Auflistung des Formulars verwendet, Button um zwei-Steuerelemente hinzuzufügen.The example also uses the Add method of the form's Controls collection to add two Button controls. Im Beispiel wird die HelpButton -Eigenschaft verwendet, um eine Hilfe Schaltfläche in der Titelleiste des Dialog Felds anzuzeigen.The example uses the HelpButton property to display a help button in the caption bar of the dialog box.

public:
   void CreateMyForm()
   {
      // Create a new instance of the form.
      Form^ form1 = gcnew Form;
      // Create two buttons to use as the accept and cancel buttons.
      Button^ button1 = gcnew Button;
      Button^ button2 = gcnew Button;
      
      // Set the text of button1 to "OK".
      button1->Text = "OK";
      // Set the position of the button on the form.
      button1->Location = Point(10,10);
      // Set the text of button2 to "Cancel".
      button2->Text = "Cancel";
      // Set the position of the button based on the location of button1.
      button2->Location =
         Point( button1->Left, button1->Height + button1->Top + 10 );
      // Set the caption bar text of the form.   
      form1->Text = "My Dialog Box";
      // Display a help button on the form.
      form1->HelpButton = true;
      
      // Define the border style of the form to a dialog box.
      form1->FormBorderStyle = ::FormBorderStyle::FixedDialog;
      // Set the MaximizeBox to false to remove the maximize box.
      form1->MaximizeBox = false;      
      // Set the MinimizeBox to false to remove the minimize box.
      form1->MinimizeBox = false;
      // Set the accept button of the form to button1.
      form1->AcceptButton = button1;
      // Set the cancel button of the form to button2.
      form1->CancelButton = button2;
      // Set the start position of the form to the center of the screen.
      form1->StartPosition = FormStartPosition::CenterScreen;
      
      // Add button1 to the form.
      form1->Controls->Add( button1 );
      // Add button2 to the form.
      form1->Controls->Add( button2 );
      // Display the form as a modal dialog box.
      form1->ShowDialog();
   }
public void CreateMyForm()
{
   // Create a new instance of the form.
   Form form1 = new Form();
   // Create two buttons to use as the accept and cancel buttons.
   Button button1 = new Button ();
   Button button2 = new Button ();
  
   // Set the text of button1 to "OK".
   button1.Text = "OK";
   // Set the position of the button on the form.
   button1.Location = new Point (10, 10);
   // Set the text of button2 to "Cancel".
   button2.Text = "Cancel";
   // Set the position of the button based on the location of button1.
   button2.Location
      = new Point (button1.Left, button1.Height + button1.Top + 10);
   // Set the caption bar text of the form.   
   form1.Text = "My Dialog Box";
   // Display a help button on the form.
   form1.HelpButton = true;

   // Define the border style of the form to a dialog box.
   form1.FormBorderStyle = FormBorderStyle.FixedDialog;
   // Set the MaximizeBox to false to remove the maximize box.
   form1.MaximizeBox = false;
   // Set the MinimizeBox to false to remove the minimize box.
   form1.MinimizeBox = false;
   // Set the accept button of the form to button1.
   form1.AcceptButton = button1;
   // Set the cancel button of the form to button2.
   form1.CancelButton = button2;
   // Set the start position of the form to the center of the screen.
   form1.StartPosition = FormStartPosition.CenterScreen;
   
   // Add button1 to the form.
   form1.Controls.Add(button1);
   // Add button2 to the form.
   form1.Controls.Add(button2);
   
   // Display the form as a modal dialog box.
   form1.ShowDialog();
}
Public Sub CreateMyForm()
    ' Create a new instance of the form.
    Dim form1 As New Form()
    ' Create two buttons to use as the accept and cancel buttons.
    Dim button1 As New Button()
    Dim button2 As New Button()
       
    ' Set the text of button1 to "OK".
    button1.Text = "OK"
    ' Set the position of the button on the form.
    button1.Location = New Point(10, 10)
    ' Set the text of button2 to "Cancel".
    button2.Text = "Cancel"
    ' Set the position of the button based on the location of button1.
    button2.Location = _
       New Point(button1.Left, button1.Height + button1.Top + 10)
    ' Set the caption bar text of the form.   
    form1.Text = "My Dialog Box"
    ' Display a help button on the form.
    form1.HelpButton = True
       
    ' Define the border style of the form to a dialog box.
    form1.FormBorderStyle = FormBorderStyle.FixedDialog
    ' Set the MaximizeBox to false to remove the maximize box.
    form1.MaximizeBox = False
    ' Set the MinimizeBox to false to remove the minimize box.
    form1.MinimizeBox = False
    ' Set the accept button of the form to button1.
    form1.AcceptButton = button1
    ' Set the cancel button of the form to button2.
    form1.CancelButton = button2
    ' Set the start position of the form to the center of the screen.
    form1.StartPosition = FormStartPosition.CenterScreen
       
    ' Add button1 to the form.
    form1.Controls.Add(button1)
    ' Add button2 to the form.
    form1.Controls.Add(button2)
       
    ' Display the form as a modal dialog box.
    form1.ShowDialog()
End Sub

Hinweise

Die Schaltfläche Abbrechen für ein Formular ist das Schaltflächen-Steuerelement, auf das geklickt wird, wenn der Benutzer die ESC-Taste drückt.The cancel button for a form is the button control that is clicked whenever the user presses the ESC key. Die dieser Eigenschaft zugewiesene Schaltfläche muss ein IButtonControl sein, das sich auf dem aktuellen Formular befindet oder sich in einem Container auf dem aktuellen Formular befindet.The button assigned to this property must be an IButtonControl that is on the current form or located within a container on the current form.

Mit dieser Eigenschaft können Sie eine Standardaktion festlegen, die auftritt, wenn der Benutzer die ESC-Taste in der Anwendung drückt.This property allows you to designate a default action to occur when the user presses the ESC key in your application. Sie können diese Eigenschaft verwenden, um dem Benutzer zu ermöglichen, schnell in einem einfachen Formular zu navigieren, indem Sie einfach die ESC-Taste drücken, um ein Fenster zu schließen, ohne dass Sie manuell auf die Schaltfläche Abbrechen klicken.You can use this property to allow the user to quickly navigate a simple form by allowing them to simply press the ESC key to close a window without committing changes instead of manually clicking the cancel button with their mouse.

CancelButtonfunktioniert möglicherweise nicht, wenn die ESC-Taste von einem anderen Steuerelement auf dem Formular abgefangen wird.CancelButton may not work if another control on the form intercepts the ESC key. Wenn Sie z. b. ein ComboBox Formular geöffnet haben, schließt ESC das ComboBox , anstatt das Formular zu schließen.For example, if you have a ComboBox open on your form, ESC will close the ComboBox instead of closing the Form.

Das IButtonControl -Objekt, CancelButton das zugewiesen ist, muss im Formular sichtbar sein, andernfalls hat das Drücken der ESC-Taste keine Auswirkung.The IButtonControl object assigned to CancelButton must be visible on the form, or else pressing the ESC key will have no effect.

Gilt für:

Siehe auch