Improving WPF Mouse Wheel Processing

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using Microsoft.Win32;

namespace Logitech.Windows
{
  public static class SystemParametersEx
  {
    #region Fields
    private static int _wheelScrollChars = -1;
    #endregion

    #region Initialization
    static SystemParametersEx()
    {
      SystemEvents.UserPreferenceChanged += OnUserPreferenceChanged;
    }
    internal static void Initialize() { }
    #endregion

    #region Queries
    public static int WheelScrollChars
    {
      get
      {
        if (_wheelScrollChars < 0)
        {
          lock (SyncMouse)
          {
            if (_wheelScrollChars < 0)
            {
              if (!SystemParametersInfo(0x006C, 0, ref _wheelScrollChars, 0))
                throw new Win32Exception();
            }
          }
        }
        return _wheelScrollChars;
      }
    }
    #endregion

    #region Helpers
    private static object SyncMouse { get { return typeof(SystemParametersEx); } }

    private static void OnUserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)
    {
      if (e.Category == UserPreferenceCategory.Mouse)
        lock (SyncMouse)
          _wheelScrollChars = -1;
    }
    [SuppressUnmanagedCodeSecurity, SecurityCritical, DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern bool SystemParametersInfo(int nAction, int nParam, ref int value, int ignore);
    #endregion
  }
}