public static SpineItem Next(this Spine spine, SpineItem item)
{
var index = spine.IndexOf(item);
if (index + 1 < spine.Count)
{
return(spine.ElementAt(index + 1));
}
return(null);
}
public static SpineItem Previous(this Spine spine, SpineItem item)
{
var index = spine.IndexOf(item);
if (index - 1 > 0)
{
return(spine.ElementAt(index - 1));
}
return(null);
}