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IButtonControl Interface

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

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

'Declaration
Public Interface IButtonControl

The IButtonControl type exposes the following members.

  NameDescription
Public propertyDialogResultGets or sets the value returned to the parent form when the button is clicked.
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  NameDescription
Public methodNotifyDefaultNotifies a control that it is the default button so that its appearance and behavior is adjusted accordingly.
Public methodPerformClickGenerates a Click event for the control.
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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
      Get
         Return Me.myDialogResult
      End Get

      Set
         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
         Me.OnClick(EventArgs.Empty)
      End If
   End Sub

End Class


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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