Raises the MouseHover event.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.Notes to Inheritors
When overriding in a derived class, be sure to call the base class's method so that registered delegates receive the event.
The following code example demonstrates how to override the and OnMouseMove methods in a derived class. To run the example, paste the following code in a new form and paste this class, forming the same file, after the form. Add a button of type FunButton to the form.
Public Class FunButton Inherits Button Protected Overrides Sub OnMouseHover(ByVal e As System.EventArgs) ' Get the font size in Points, add one to the ' size, and reset the button's font to the larger ' size. Dim fontSize As Single = Font.SizeInPoints fontSize += 1 Dim buttonSize As System.Drawing.Size = Size Me.Font = New System.Drawing.Font _ (Font.FontFamily, fontSize, Font.Style) ' Increase the size width and height of the button ' by 5 points each. Size = New System.Drawing.Size _ (Size.Width + 5, Size.Height + 5) ' Call myBase.OnMouseHover to activate the delegate. MyBase.OnMouseHover(e) End Sub Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs) ' Make the cursor the Hand cursor when the mouse moves ' over the button. Cursor = Cursors.Hand ' Call MyBase.OnMouseMove to activate the delegate. MyBase.OnMouseMove(e) End Sub