/// <summary>/// 向下遞歸查找控件/// </summary>/// <param name="parentControl">查找控件的父容器控件</param>/// <param name="findCtrlName">查找控件名稱</param>/// <returns>若沒有查找到返回NULL</returns>public static Control DownRecursiveFindControl(this Control parentControl, string findCtrlName){  Control _findedControl = null;  if (!string.IsNullOrEmpty(findCtrlName) && parentControl != null)  { foreach (Control ctrl in parentControl.Controls) {   if (ctrl.Name.Equals(findCtrlName))   { _findedControl = ctrl; break;   }   else   { if (ctrl.Controls.Count > 0)   _findedControl = DownRecursiveFindControl(ctrl, findCtrlName);   } }  }  return _findedControl;}/// <summary>/// 將Control轉換某種控件類型/// </summary>/// <typeparam name="T">控件類型</typeparam>/// <param name="control">Control</param>/// <param name="result">轉換結果</param>/// <returns>若成功則返回控件；若失敗則返回NULL</returns>public static T Cast<T>(this Control control, out bool result) where T : Control{  result = false;  T _castCtrl = null;  if (control != null)  { if (control is T) {   try   { _castCtrl = control as T; result = true;   }   catch (Exception ex)   { Debug.WriteLine(string.Format("將Control轉換某種控件類型異常，原因:{0}", ex.Message)); result = false;   } }  }  return _castCtrl;}

bool _sucess = false;CheckBox _finded = this.DownRecursiveFindControl("checkBox1").Cast<CheckBox>(out _sucess);if (_sucess){ MessageBox.Show(_finded.Name);}else{ MessageBox.Show("Not Finded.");}