修改

Question

我有一些代码使用自定义popupNotifier订阅点击事件，如下所示：

popupNotifier1.Click += new EventHandler(PopUpClicked);

这意味着当有人点击打开弹出窗口时会启动一个url字符串。假设_url暂时是全球性的。

我在PopUpClicked中执行此操作：

  public void PopUpClicked(object sender, EventArgs e)
        {
            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(_url);
            proc.StartInfo = startInfo;
            proc.Start();
        }

网址_url包含一个字符串，如：

http://mysite/mypage.aspx?MyID=100

这很好用..打开页面但我注意到它会打开同一页面的多个标签。我不明白为什么？

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只是为了添加更多代码，我从每分钟命中的计时器事件中调用此代码，但注意if条件，它只在有数据的情况下订阅事件：

 private void timer1_Tick(object sender, EventArgs e)
        {
            SqlDataReader sr;
            string ticketInfo = String.Empty;
            string url = String.Empty;
            bool hasData = false;
            using (SqlConnection sc = new SqlConnection(_connString))
            {
                using (SqlCommand scmd = new SqlCommand("select_poll"))
                {
                    scmd.Connection = sc;
                    scmd.CommandType = CommandType.StoredProcedure;
                    scmd.Parameters.Add("LoginID", SqlDbType.BigInt).Value = _userLoginID;
                    scmd.Parameters.Add("FacilityID", SqlDbType.BigInt).Value = _userFacilityID;
                    sc.Open();
                    sr = scmd.ExecuteReader(CommandBehavior.CloseConnection);

                    if (sr != null)
                    {
                        while (sr.Read())
                        {
                            hasData = true;
                            ticketInfo += sr["TicketID"].ToString() + " - " + sr["Ticket"].ToString() + Environment.NewLine;
                            _url = "http://mysite/mypage.aspx?ID=" + sr["TicketID"].ToString();
                        }
                    }
                }
            }

            if (hasData)
            {
                popupNotifier1.TitleColor = System.Drawing.Color.Green;
                popupNotifier1.ContentText = ticketInfo;
                popupNotifier1.Scroll = true;
                popupNotifier1.TitlePadding = new System.Windows.Forms.Padding(2);
                popupNotifier1.ContentPadding = new System.Windows.Forms.Padding(2);
                popupNotifier1.Image = Properties.Resources.medical;
                popupNotifier1.ImagePadding = new System.Windows.Forms.Padding(10);
                popupNotifier1.Click += new EventHandler(PopUpClicked);
                popupNotifier1.Popup();
            }
        }

        public void PopUpClicked(object sender, EventArgs e)
        {
            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(_url);
            proc.StartInfo = startInfo;
            proc.Start();
        }

Answer 1

popupNotifier1.Click += new EventHandler(PopUpClicked);

以上几行多次订阅event，因此第一次启动PopUp时会触发one tab，下次2 tab，然后下次three tab n等等

只添加处理程序一次，最好的方法是，在你启用代码中的计时器之前

像

popupNotifier1.Click += new EventHandler(PopUpClicked);
timer1.Enabled = true;

固定代码

private void timer1_Tick(object sender, EventArgs e)
        {
            SqlDataReader sr;
            string ticketInfo = String.Empty;
            string url = String.Empty;
            bool hasData = false;
            using (SqlConnection sc = new SqlConnection(_connString))
            {
                using (SqlCommand scmd = new SqlCommand("select_poll"))
                {
                    scmd.Connection = sc;
                    scmd.CommandType = CommandType.StoredProcedure;
                    scmd.Parameters.Add("LoginID", SqlDbType.BigInt).Value = _userLoginID;
                    scmd.Parameters.Add("FacilityID", SqlDbType.BigInt).Value = _userFacilityID;
                    sc.Open();
                    sr = scmd.ExecuteReader(CommandBehavior.CloseConnection);

                    if (sr != null)
                    {
                        while (sr.Read())
                        {
                            hasData = true;
                            ticketInfo += sr["TicketID"].ToString() + " - " + sr["Ticket"].ToString() + Environment.NewLine;
                            _url = "http://mysite/mypage.aspx?ID=" + sr["TicketID"].ToString();
                        }
                    }
                }
            }

            if (hasData)
            {
                popupNotifier1.TitleColor = System.Drawing.Color.Green;
                popupNotifier1.ContentText = ticketInfo;
                popupNotifier1.Scroll = true;
                popupNotifier1.TitlePadding = new System.Windows.Forms.Padding(2);
                popupNotifier1.ContentPadding = new System.Windows.Forms.Padding(2);
                popupNotifier1.Image = Properties.Resources.medical;
                popupNotifier1.ImagePadding = new System.Windows.Forms.Padding(10);
                popupNotifier1.Popup();
            }
        }

        public void PopUpClicked(object sender, EventArgs e)
        {
            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(_url);
            proc.StartInfo = startInfo;
            proc.Start();
        }

Answer 2

您多次订阅该活动。在这种特殊情况下，只要在计时器触发时满足特定条件，您就可以订阅该事件。这似乎不止一次发生。

您几乎肯定希望在tick事件之外附加事件处理程序，可能是在首次加载表单时。

从winform app打开网页会打开太多标签？

修改

2 个答案:

固定代码