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KeyEventArgs.Alt Property

Gets a value indicating whether the ALT key was pressed.

[Visual Basic]
Public Overridable ReadOnly Property Alt As Boolean
[C#]
public virtual bool Alt {get;}
[C++]
public: __property virtual bool get_Alt();
[JScript]
public function get Alt() : Boolean;

Property Value

true if the ALT key was pressed; otherwise, false.

Example

[Visual Basic] 
' This example demonstrates how to use the KeyDown event with the Help class to display
' pop-up style help to the user of the application. The example filters for all variations
' of pressing the F1 key with a modifier key by using the KeyEventArgs properties passed
' to the event handling method. 
' When the user presses any variation of F1 that includes any keyboard modifier, the Help
' class displays a pop-up window, similar to a ToolTip, near the control. If the user presses 
' ALT + F2, a different Help pop-up is displayed with additional information. This example assumes
' that a TextBox control, named textBox1, has been added to the form and its KeyDown
' event has been contected to this event handling method.
Private Sub textBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles textBox1.KeyDown
    ' Determine whether the key entered is the F1 key. If it is, display Help.
    If e.KeyCode = Keys.F1 AndAlso (e.Alt OrElse e.Control OrElse e.Shift) Then
        ' Display a pop-up Help topic to assist the user.
        Help.ShowPopup(textBox1, "Enter your name.", New Point(textBox1.Bottom, textBox1.Right))
    ElseIf e.KeyCode = Keys.F2 AndAlso e.Modifiers = Keys.Alt Then
        ' Display a pop-up Help topic to provide additional assistance to the user.
        Help.ShowPopup(textBox1, "Enter your first name followed by your last name. Middle name is optional.", _
             New Point(textBox1.Top, Me.textBox1.Left))
    End If
End Sub 'textBox1_KeyDown

[C#] 
// This example demonstrates how to use the KeyDown event with the Help class to display
// pop-up style help to the user of the application. The example filters for all variations
// of pressing the F1 key with a modifier key by using the KeyEventArgs properties passed
// to the event handling method.
// When the user presses any variation of F1 that includes any keyboard modifier, the Help
// class displays a pop-up window, similar to a ToolTip, near the control. If the user presses
// ALT + F2, a different Help pop-up is displayed with additional information. This example assumes
// that a tTextBox control, named textBox1, has been added to the form and its KeyDown
// event has been contected to this event handling method.
private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
    // Determine whether the key entered is the F1 key. If it is, display Help.
    if(e.KeyCode == Keys.F1 && (e.Alt || e.Control || e.Shift))
    {
        // Display a pop-up Help topic to assist the user.
        Help.ShowPopup(textBox1, "Enter your name.", new Point(textBox1.Bottom, textBox1.Right));
    }
    else if(e.KeyCode == Keys.F2 && e.Modifiers == Keys.Alt)
    {
        // Display a pop-up Help topic to provide additional assistance to the user.
        Help.ShowPopup(textBox1, "Enter your first name followed by your last name. Middle name is optional.",
            new Point(textBox1.Top, this.textBox1.Left));
    }
}

[C++] 
// This example demonstrates how to use the KeyDown event with the Help class to display
// pop-up style help to the user of the application. The example filters for all variations
// of pressing the F1 key with a modifier key by using the KeyEventArgs properties passed
// to the event handling method.
// When the user presses any variation of F1 that includes any keyboard modifier, the Help
// class displays a pop-up window, similar to a ToolTip, near the control. If the user presses
// ALT + F2, a different Help pop-up is displayed with additional information. This example assumes
// that a tTextBox control, named textBox1, has been added to the form and its KeyDown
// event has been contected to this event handling method.
private:
void textBox1_KeyDown(Object* /*sender*/, System::Windows::Forms::KeyEventArgs* e)
{
   // Determine whether the key entered is the F1 key. If it is, display Help.
   if(e->KeyCode == Keys::F1 && (e->Alt || e->Control || e->Shift))
   {
      // Display a pop-up Help topic to assist the user.
      Help::ShowPopup(textBox1, S"Enter your name.", Point(textBox1->Bottom, textBox1->Right));
   }
   else if(e->KeyCode == Keys::F2 && e->Modifiers == Keys::Alt)
   {
      // Display a pop-up Help topic to provide additional assistance to the user.
      Help::ShowPopup(textBox1, S"Enter your first name followed by your last name. Middle name is optional.",
         Point(textBox1->Top, this->textBox1->Left));
   }
}

[Visual Basic] 
Private Sub treeView1_KeyDown(sender As Object, _
  e As KeyEventArgs) Handles treeView1.KeyDown
   ' If the 'Alt' and 'E' keys are pressed,
   ' allow the user to edit the TreeNode label. 
   If e.Alt And e.KeyCode = Keys.E Then
      treeView1.LabelEdit = True
      ' If there is a TreeNode under the mose cursor, begin editing. 
      Dim editNode As TreeNode = treeView1.GetNodeAt( _
        treeView1.PointToClient(Control.MousePosition))
      If Not (editNode Is Nothing) Then
         editNode.BeginEdit()
      End If
   End If
End Sub

Private Sub treeView1_AfterLabelEdit(sender As Object, _
  e As NodeLabelEditEventArgs) Handles treeView1.AfterLabelEdit
   ' Disable the ability to edit the TreeNode labels.
   treeView1.LabelEdit = False
End Sub

[C#] 
private void treeView1_KeyDown(object sender, KeyEventArgs e)
{
   /* If the 'Alt' and 'E' keys are pressed,
      * allow the user to edit the TreeNode label. */
   if(e.Alt && e.KeyCode == Keys.E)
         
   {
      treeView1.LabelEdit = true;
      // If there is a TreeNode under the mose cursor, begin editing. 
      TreeNode editNode = treeView1.GetNodeAt(
         treeView1.PointToClient(Control.MousePosition));
      if(editNode != null)
      { 
         editNode.BeginEdit();
      }
   }
}

private void treeView1_AfterLabelEdit(object sender, NodeLabelEditEventArgs e)
{
   // Disable the ability to edit the TreeNode labels.
   treeView1.LabelEdit = false;
}

[C++] 
private:
    void treeView1_KeyDown(Object* /*sender*/, KeyEventArgs* e) {
        /* If the 'Alt' and 'E' keys are pressed,
         * allow the user to edit the TreeNode label. */
        if (e->Alt && e->KeyCode == Keys::E) {
            treeView1->LabelEdit = true;
            // If there is a TreeNode under the mose cursor, begin editing.
            TreeNode* editNode = treeView1->GetNodeAt(
                treeView1->PointToClient(Control::MousePosition));
            if (editNode != 0) {
                editNode->BeginEdit();
            }
        }
    }

    void treeView1_AfterLabelEdit(Object* /*sender*/, NodeLabelEditEventArgs* /*e*/) {
        // Disable the ability to edit the TreeNode labels.
        treeView1->LabelEdit = false;
    }

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

See Also

KeyEventArgs Class | KeyEventArgs Members | System.Windows.Forms Namespace | Control | Shift | Modifiers

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