Preprocesses keyboard or input messages within the message loop before they are dispatched.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
'Declaration <SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags := SecurityPermissionFlag.UnmanagedCode)> _ <SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags := SecurityPermissionFlag.UnmanagedCode)> _ Public Overridable Function PreProcessMessage ( _ ByRef msg As Message _ ) As Boolean
Return ValueType: System.Boolean
true if the message was processed by the control; otherwise, false.
is called by the application's message loop to preprocess input messages before they are dispatched. Possible values for the msg parameter are WM_KEYDOWN, WM_SYSKEYDOWN, WM_CHAR, and WM_SYSCHAR.
When overriding , a control should return true to indicate that it has processed the message. For messages that are not processed by the control, the result of base.PreProcessMessage should be returned. Controls will typically override one of the more specialized methods such as IsInputChar, IsInputKey, ProcessCmdKey, ProcessDialogChar, or ProcessDialogKey instead of overriding .