IButtonControl Interface


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Allows a control to act like a button on a form.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

Public Interface IButtonControl


Gets or sets the value returned to the parent form when the button is clicked.


Notifies a control that it is the default button so that its appearance and behavior is adjusted accordingly.


Generates a Click event for the control.

An example of where this interface might be implemented is default and cancel button processing. Default buttons are notified when an unprocessed ENTER key is entered for a form, just like a dialog box would be closed. Similarly, cancel buttons are notified whenever an unprocessed ESC key is entered on a form, much like a dialog box would be dismissed.

Notes to Implementers:

Implement this interface in classes that act as button controls. The members of this interface will provide basic button functionality, such as providing a DialogResult to the parent form or the ability to perform a Click event, or acting as the default button of a form.

The following example inherits from the ButtonBase class and implements the IButtonControl interface. Implementation is added to the DialogResult property and the NotifyDefault and PerformClick methods.

Imports System
Imports System.Windows.Forms
Imports System.Drawing

Public Class MyButton
   Inherits ButtonBase
   Implements IButtonControl 
   Private myDialogResult As DialogResult

   Public Sub New()
      ' Make the button White and a Popup style
      ' so it can be distinguished on the form.
      Me.FlatStyle = FlatStyle.Popup
      Me.BackColor = Color.White
   End Sub

   ' Add implementation to the IButtonControl.DialogResult property.
   Public Property DialogResult() As DialogResult Implements IButtonControl.DialogResult
         Return Me.myDialogResult
      End Get

         If [Enum].IsDefined(GetType(DialogResult), value) Then
            Me.myDialogResult = value
         End If
      End Set
   End Property

   ' Add implementation to the IButtonControl.NotifyDefault method.
   Public Sub NotifyDefault(value As Boolean) Implements IButtonControl.NotifyDefault
      If Me.IsDefault <> value Then
         Me.IsDefault = value
      End If
   End Sub 

   ' Add implementation to the IButtonControl.PerformClick method.
   Public Sub PerformClick() Implements IButtonControl.PerformClick
      If Me.CanSelect Then
      End If
   End Sub

End Class

.NET Framework
Available since 1.1
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