Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Thetype exposes the following members.
|Alt||Gets a value indicating whether the ALT key was pressed.|
|Control||Gets a value indicating whether the CTRL key was pressed.|
|Handled||Gets or sets a value indicating whether the event was handled.|
|KeyCode||Gets the keyboard code for a KeyDown or KeyUp event.|
|KeyData||Gets the key data for a KeyDown or KeyUp event.|
|KeyValue||Gets the keyboard value for a KeyDown or KeyUp event.|
|Modifiers||Gets the modifier flags for a KeyDown or KeyUp event. The flags indicate which combination of CTRL, SHIFT, and ALT keys was pressed.|
|Shift||Gets a value indicating whether the SHIFT key was pressed.|
|SuppressKeyPress||Gets or sets a value indicating whether the key event should be passed on to the underlying control.|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Serves as a hash function for a particular type. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
The KeyDown event occurs when the user presses any key. The KeyUp event occurs when the user releases the key. Duplicate KeyDown events occur each time the key repeats, if the key is held down, but only one KeyUp event is generated when the user releases the key.
For information about the event model, see Events and Delegates.
The following code examples demonstrate how to detect the state of a key press.
The following code example demonstrates how to use the KeyDown event with the Help class to display pop-up style Help to the user of the application. The example uses the properties passed to the event handler method to filter for all variations of pressing the F1 key with a modifier key. When the user presses any variation of F1 that includes any keyboard modifier, the Help class displays a pop-up window, similar to a ToolTip, near the control. If the user presses ALT+F2, a different Help pop-up is displayed with additional information.