MouseEventHandler Delegate


Represents the method that will handle the MouseDown, MouseUp, or MouseMove event of a form, control, or other component.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

type MouseEventHandler = 
    delegate of 
        sender:Object *
        e:MouseEventArgs -> unit


Type: System.Object

The source of the event.

Type: System.Windows.Forms.MouseEventArgs

A MouseEventArgs that contains the event data.

When you create a MouseEventHandler 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 Handling and Raising Events.

The following code example demonstrates using different mouse events to draw the path of the mouse on a Panel. A line segment is added to the GraphicsPath for each MouseMove and MouseDown events that occur. To update the graphics, the Invalidate method is called for the Panel on each MouseDown and MouseUp event. In addition, the graphic path is scrolled up or down when the MouseWheel event occurs. Additional mouse events, like MouseHover, are identified on screen as well. Also displayed on the screen is additional information about the mouse from the SystemInformation class.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
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