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Control.OnMouseHover Method

Raises the MouseHover event.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
protected virtual void OnMouseHover(
	EventArgs e
)

Parameters

e
Type: System.EventArgs

An EventArgs that contains the event data.

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnMouseHover 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 OnMouseHover in a derived class, be sure to call the base class's OnMouseHover method so that registered delegates receive the event.

The following code example demonstrates how to override the OnMouseHover 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:
	Button

{
	protected override void OnMouseHover(System.EventArgs e)
	{

		// Get the font size in Points, add one to the 
		// size, and reset the button's font to the larger 
		// size. 
		float fontSize = Font.SizeInPoints;
		fontSize += 1;
		System.Drawing.Size buttonSize = Size;
		this.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. 
		base.OnMouseHover(e);
	}

	protected override void OnMouseMove(MouseEventArgs e)
	{

		// Make the cursor the Hand cursor when the mouse moves  
		// over the button.
		Cursor = Cursors.Hand;

		// Call MyBase.OnMouseMove to activate the delegate. 
		base.OnMouseMove(e);
	}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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