IMessageFilter.PreFilterMessage Method
Filters out a message before it is dispatched.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] bool PreFilterMessage( ref Message m )
Parameters
- m
- Type: System.Windows.Forms.Message
The message to be dispatched. You cannot modify this message.
Return Value
Type: System.Booleantrue to filter the message and stop it from being dispatched; false to allow the message to continue to the next filter or control.
Use PreFilterMessage to filter out a message before it is dispatched to a control or form. For example, to stop the Click event of a Button control from being dispatched to the control, you implement the PreFilterMessage method and return a true value when the Click message occurs. You can also use this method to perform code work that you might need to do before the message is dispatched.
- SecurityPermission
Requires UnmanagedCode permission at link time.
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.
