/// <summary>
/// 先右找一个列信息
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <param name="t"></param>
/// <returns></returns>
public static EditColumn LeftColumnItem(this List <EditColumn> source, EditColumn t)
{
return(GetItem(source.OfType <object>().ToList(), source.IndexOf(t) - 1, t) as EditColumn);
}
/// <summary>
/// 先右找一个列信息
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <param name="t"></param>
/// <returns></returns>
public static EditColumn LeftColumnItem(this List<EditColumn> source, EditColumn t)
{
return GetItem(source.OfType<object>().ToList(), source.IndexOf(t) - 1, t) as EditColumn;
}