/// <summary>Retrieves the <see cref="Environment.SpecialFolder"/> associated with a <see cref="Shell32.KNOWNFOLDERID_Enum"/> if it exists.</summary>
/// <param name="id">The known folder.</param>
/// <returns>The <see cref="Environment.SpecialFolder"/> if defined, <c>null</c> otherwise.</returns>
public static Environment.SpecialFolder?SpecialFolder(this Shell32.KNOWNFOLDERID_Enum id)
{
var attr = typeof(Shell32.KNOWNFOLDERID_Enum).GetField(id.ToString()).GetCustomAttributes(typeof(Shell32.KnownFolderDetailAttribute), false);
var ret = (Environment.SpecialFolder) 0XFFFF;
if (attr.Length > 0)
{
ret = ((Shell32.KnownFolderDetailAttribute)attr[0]).Equivalent;
}
return(ret == (Environment.SpecialFolder) 0XFFFF ? (Environment.SpecialFolder?)null : ret);
}
/// <summary>Retrieves the Guid associated with a <see cref="Shell32.KNOWNFOLDERID_Enum"/>.</summary>
/// <param name="id">The known folder.</param>
/// <returns>The GUID.</returns>
public static Guid Guid(this Shell32.KNOWNFOLDERID_Enum id)
{
var attr = typeof(Shell32.KNOWNFOLDERID_Enum).GetField(id.ToString()).GetCustomAttributes(typeof(Shell32.KnownFolderDetailAttribute), false);
return(attr.Length > 0 ? ((Shell32.KnownFolderDetailAttribute)attr[0]).guid : System.Guid.Empty);
}