KeyEventHandler Delegate
Assembly: System.Windows.Forms (in system.windows.forms.dll)
'Declaration Public Delegate Sub KeyEventHandler ( _ sender As Object, _ e As KeyEventArgs _ ) 'Usage Dim instance As New KeyEventHandler(AddressOf HandlerMethod)
/** @delegate */ public delegate void KeyEventHandler ( Object sender, KeyEventArgs e )
JScript supports the use of delegates, but not the declaration of new ones.
Parameters
- sender
The source of the event.
- e
A KeyEventArgs that contains the event data.
When you create a KeyEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about handling events with delegates, see Events and Delegates.
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
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.get_Alt() && e.get_KeyCode() == Keys.E) {
treeView1.set_LabelEdit(true);
// If there is a TreeNode under the mose cursor, begin editing.
TreeNode editNode = treeView1.GetNodeAt(treeView1.PointToClient(
Control.get_MousePosition()));
if (editNode != null) {
editNode.BeginEdit();
}
}
} //treeView1_KeyDown
private void treeView1_AfterLabelEdit(Object sender,
NodeLabelEditEventArgs e)
{
// Disable the ability to edit the TreeNode labels.
treeView1.set_LabelEdit(false);
} //treeView1_AfterLabelEdit
' Boolean flag used to determine when a character other than a number is entered.
Private nonNumberEntered As Boolean = False
' Handle the KeyDown event to determine the type of character entered into the control.
Private Sub textBox1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) _
Handles textBox1.KeyDown
' Initialize the flag to false.
nonNumberEntered = False
' Determine whether the keystroke is a number from the top of the keyboard.
If e.KeyCode < Keys.D0 OrElse e.KeyCode > Keys.D9 Then
' Determine whether the keystroke is a number from the keypad.
If e.KeyCode < Keys.NumPad0 OrElse e.KeyCode > Keys.NumPad9 Then
' Determine whether the keystroke is a backspace.
If e.KeyCode <> Keys.Back Then
' A non-numerical keystroke was pressed.
' Set the flag to true and evaluate in KeyPress event.
nonNumberEntered = True
End If
End If
End If
End Sub 'textBox1_KeyDown
' This event occurs after the KeyDown event and can be used
' to prevent characters from entering the control.
Private Sub textBox1_KeyPress(sender As Object, e As System.Windows.Forms.KeyPressEventArgs) _
Handles textBox1.KeyPress
' Check for the flag being set in the KeyDown event.
If nonNumberEntered = True Then
' Stop the character from being entered into the control since it is non-numerical.
e.Handled = True
End If
End Sub 'textBox1_KeyPress
End Class 'Form1
// Boolean flag used to determine when a character other than a number
// is entered.
private boolean nonNumberEntered = false;
// Handle the KeyDown event to determine the type of character entered
// into the control.
private void textBox1_KeyDown(Object sender,
System.Windows.Forms.KeyEventArgs e)
{
// Initialize the flag to false.
nonNumberEntered = false;
// Determine whether the keystroke is a number from the top of the
// keyboard.
if ((e.get_KeyCode().CompareTo(Keys.D0)) < 0
|| (e.get_KeyCode().CompareTo(Keys.D9) > 0)) {
// Determine whether the keystroke is a number from the keypad.
if ((e.get_KeyCode().CompareTo(Keys.NumPad0) < 0
|| (e.get_KeyCode().CompareTo(Keys.NumPad9)) > 0)) {
// Determine whether the keystroke is a backspace.
if (!(e.get_KeyCode().Equals(Keys.Back))) {
// A non-numerical keystroke was pressed.
// Set the flag to true and evaluate in KeyPress event.
nonNumberEntered = true;
}
}
}
} //textBox1_KeyDown
// This event occurs after the KeyDown event and can be used to prevent
// characters from entering the control.
private void textBox1_KeyPress(Object sender, System.Windows.Forms.
KeyPressEventArgs e)
{
// Check for the flag being set in the KeyDown event.
if (nonNumberEntered == true) {
// Stop the character from being entered into the control since
// it is non-numerical.
e.set_Handled(true);
}
} //textBox1_KeyPress
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.