Mega Code Archive

 

Categories / C# / Windows

 

Removing an Installed Message Filter

using System; using System.Windows.Forms;     public class BlockLeftMouseButtonMessageFilter : IMessageFilter {     const int WM_LBUTTONDOWN = 0x201;          public bool PreFilterMessage(ref Message m) {         if(m.Msg == WM_LBUTTONDOWN)         {             Console.WriteLine("The left mouse button is down.");             Application.RemoveMessageFilter(this);             return true;         }         return false;     } }     public class MainForm : Form {     public static void Main()     {         MainForm MyForm = new MainForm();         BlockLeftMouseButtonMessageFilter MsgFilter = new BlockLeftMouseButtonMessageFilter();             Application.AddMessageFilter(MsgFilter);         Application.Run(MyForm);     }         public MainForm()     {         Text = "Message Filter Removal Test";     } }