File: Windows\Win32\Interop.RegisteredMessage.cs
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Project: src\src\System.Windows.Forms.Primitives\src\System.Windows.Forms.Primitives.csproj (System.Windows.Forms.Primitives)
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Windows.Win32;
 
internal static class RegisteredMessage
{
    private static uint s_wmMouseEnterMessage;
    private static uint s_wmUnSubclass;
 
    public static MessageId WM_MOUSEENTER
    {
        get
        {
            if (s_wmMouseEnterMessage == 0)
            {
                s_wmMouseEnterMessage = PInvoke.RegisterWindowMessage("WinFormsMouseEnter");
            }
 
            return s_wmMouseEnterMessage;
        }
    }
 
    public static MessageId WM_UIUNSUBCLASS
    {
        get
        {
            if (s_wmUnSubclass == 0)
            {
                s_wmUnSubclass = PInvoke.RegisterWindowMessage("WinFormsUnSubclass");
            }
 
            return s_wmUnSubclass;
        }
    }
}