遍历Control找出指定control

直接上方法：

public static IList<T> GetAllControlsRecusrvive<T>(Control control) where T : Control
        {
            var rtn = new List<T>();
            foreach (Control item in control.Controls)
            {
                var ctr = item as T;
                if (ctr != null)
                {
                    rtn.Add(ctr);
                }
                else
                {
                    rtn.AddRange(GetAllControlsRecusrvive<T>(item));
                }
            }
            return rtn;
        }