ToolStripItem.OnMouseEnter(EventArgs) Method

Definition

Raises the MouseEnter event.

C#
protected virtual void OnMouseEnter(EventArgs e);

Parameters

e
EventArgs

An EventArgs that contains the event data.

Examples

The following code example demonstrates how to override the OnMouseEnter method. This code example is part of a larger example provided for the ToolStripItem class.

C#
// This method defines the behavior of the MouseEnter event.
// It sets the state of the rolloverValue field to true and
// tells the control to repaint.
protected override void OnMouseEnter(EventArgs e)
{
    base.OnMouseEnter(e);

    this.rolloverValue = true;

    this.Invalidate();
}

Remarks

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

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

Applies to

Product Versions
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9