.NET Windows Forms in a Nutshell

Name

Message

Synopsis

This value type wraps a Win32 message, and is used in message filtering (through the Application.AddMessageFilter() method) and Control.WndProc() message processing. Obviously, this is very closely bound to the operating system, and you should only use this sort of message processing in interop applications—typically, when you are wrapping a Win32 control for your own purposes. You can retrieve the HWnd, LParam, WParam, and Msg ID. You can also set the Result to be returned to Windows if you handle the message.

You shouldn’t create instances of this class directly, but instead use the static Create() factory method, which ensures that the message is properly initialized.

public struct Message {

// Public Instance Properties

   public IntPtr HWnd{set; get; }

   public IntPtr LParam{set; get; }

   public int Msg{set; get; }

   public IntPtr Result{set; get; }

   public IntPtr WParam{set; get; }

// Public Static Methods

   public static Message Create(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam);

// Public Instance Methods

   public override bool Equals(object o);  // overrides ValueType

   public override int GetHashCode();  // overrides ValueType

   public object GetLParam(Type cls);

   public override string ToString();  // overrides ValueType

}

Hierarchy

System.Object → System.ValueType → Message

Passed To

Multiple types