Application.RemoveMessageFilter(IMessageFilter) Method
Important
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Removes a message filter from the message pump of the application.
public:
static void RemoveMessageFilter(System::Windows::Forms::IMessageFilter ^ value);
public static void RemoveMessageFilter (System.Windows.Forms.IMessageFilter value);
static member RemoveMessageFilter : System.Windows.Forms.IMessageFilter -> unit
Public Shared Sub RemoveMessageFilter (value As IMessageFilter)
- value
- IMessageFilter
The implementation of the IMessageFilter to remove from the application.
Before you can use a message filter, you must provide an implementation for the IMessageFilter interface. The following class creates a message filter called TestMessageFilter
. This filter blocks all messages relating to the left mouse button.
// Creates a message filter.
ref class TestMessageFilter: public IMessageFilter
{
public:
[SecurityPermission(SecurityAction::LinkDemand, Flags = SecurityPermissionFlag::UnmanagedCode)]
virtual bool PreFilterMessage( Message % m )
{
// Blocks all the messages relating to the left mouse button.
if ( m.Msg >= 513 && m.Msg <= 515 )
{
Console::WriteLine( "Processing the messages : {0}", m.Msg );
return true;
}
return false;
}
};
// Creates a message filter.
public class TestMessageFilter : IMessageFilter
{
public bool PreFilterMessage(ref Message m)
{
// Blocks all the messages relating to the left mouse button.
if (m.Msg >= 513 && m.Msg <= 515)
{
Console.WriteLine("Processing the messages : " + m.Msg);
return true;
}
return false;
}
}
' Creates a message filter.
<SecurityPermission(SecurityAction.LinkDemand, Flags := SecurityPermissionFlag.UnmanagedCode)> _
Public Class TestMessageFilter
Implements IMessageFilter
<SecurityPermission(SecurityAction.Demand)> _
Public Function PreFilterMessage(ByRef m As System.Windows.Forms.Message) _
As Boolean Implements IMessageFilter.PreFilterMessage
' Blocks all the messages relating to the left mouse button.
If ((m.Msg >= 513) And (m.Msg <= 515)) Then
Console.WriteLine("Processing the messages : " & m.Msg)
Return True
End If
Return False
End Function
End Class
You can remove a message filter when you no longer want to capture Windows messages before they are dispatched.
Product | Versions |
---|---|
.NET Framework | 1.1, 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 |
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