VS整死了，属性惹的祸

    /// <summary>
    /// 隐藏除外径与壁厚之外的所有项
    /// </summary>
    protected bool zHideSelectItems = false;
    /// <summary>
    /// 隐藏除外径与壁厚之外的所有项
    /// </summary>
    public bool HideSelectItems
    {
      set
      {
        zHideSelectItems = value;

        lblStandard.Visible = !value;
        lblDn.Visible = !value;
        lblSchdule.Visible = !value;

        cbStandard.Visible = !value;
        cbDn.Visible = !value;
        cbSchedule.Visible = !value;

        if (value)
        {
          tlpPipe.RowStyles[0].Height = 0f;
          tlpPipe.RowStyles[1].Height = 0f;
          tlpPipe.RowStyles[2].Height = 0f;
          gbPipe.Height = 85;
        }
        else
        {
          tlpPipe.RowStyles[0].Height = 30f;
          tlpPipe.RowStyles[1].Height = 30f;
          tlpPipe.RowStyles[2].Height = 30f;
          gbPipe.Height = 175;
        }
      }
      get
      {
        return zHideSelectItems;
      }
    }

第12行在复制粘贴过程中忘记改成zHideSelectItems，导致程序在未开启时就死循环。