Question

我有一个asp.net应用程序，其中有一个用户可以发布消息的页面。这些消息是从数据库中检索出来的，正好在我的页面加载代码中的正文中存储它们。对于每条消息，生成一个新的div，其中有另一个div用于消息，另一个用于用户名。为每个帖子制作一个按钮，问题是我希望按钮从div中删除一个帖子（因此数据库中的消息）。但我无法弄清楚如何做到这一点，因为一切都是在代码背后生成的。也许FindControl（）可以帮忙吗？

String connString = System.Configuration.ConfigurationManager.ConnectionStrings["WebAppConnString"].ToString();
            conn = new MySqlConnection(connString);               
            conn.Open();
            queryStr = "SELECT berichtID ,bericht, user FROM tblforum ORDER BY berichtID DESC";
            cmd = new MySqlCommand(queryStr, conn);
            MySqlDataReader Reader = cmd.ExecuteReader();
        try {
            while (Reader.Read())
            {
                ImageButton Button = new ImageButton();
                Button.ImageUrl = "https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-ios7-gear-512.png";
                HtmlGenericControl User = new HtmlGenericControl("div");
                HtmlGenericControl Div = new HtmlGenericControl("div");
                HtmlGenericControl Username = new HtmlGenericControl("p");
                HtmlGenericControl Message = new HtmlGenericControl("p");
                Button.Style.Add("max-height", "inherit");
                Button.Style.Add("width", "auto");
                Button.Style.Add("float", "right");
                Username.InnerText = Reader["user"].ToString() + " said: ";
                Div.Style.Add("border-bottom", "6px solid black");
                Div.Style.Add("background-color", "#006633");
                Message.Style.Add("color", "#d3d3d3");
                forumsection.Controls.Add(Div);
                Message.InnerText = Reader["bericht"].ToString();
                Div.Controls.Add(User);
                User.Controls.Add(Button);
                User.Controls.Add(Username);
                Div.Controls.Add(Message);
            }
            Reader.Close();
        }

谢谢

Answer 1

试试这个......

        protected void Page_Load(object sender, EventArgs e)
        {
            DisplayData();
        }

        private void DisplayData()
        {
            //your code
            string connString = System.Configuration.ConfigurationManager.ConnectionStrings["WebAppConnString"].ToString();
            conn = new MySqlConnection(connString);
            conn.Open();
            queryStr = "SELECT berichtID ,bericht, user FROM tblforum ORDER BY berichtID DESC";
            cmd = new MySqlCommand(queryStr, conn);
            MySqlDataReader Reader = cmd.ExecuteReader();
            try
            {
                while (Reader.Read())
                {
                    ImageButton Button = new ImageButton();                        
                    Button.ImageUrl = "https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-ios7-gear-512.png";
                    //**************ADD THIS TO FIRE DELETE*************
                    Button.Click += Button_Click;
                    Button.ID = "btnForDBItem_" + Reader.GetOrdinal("berichtID").ToString();
                    //**************END OF FIRE DELETE*****************
                    HtmlGenericControl User = new HtmlGenericControl("div");
                    HtmlGenericControl Div = new HtmlGenericControl("div");
                    HtmlGenericControl Username = new HtmlGenericControl("p");
                    HtmlGenericControl Message = new HtmlGenericControl("p");
                    Button.Style.Add("max-height", "inherit");
                    Button.Style.Add("width", "auto");
                    Button.Style.Add("float", "right");
                    Username.InnerText = Reader["user"].ToString() + " said: ";
                    Div.Style.Add("border-bottom", "6px solid black");
                    Div.Style.Add("background-color", "#006633");
                    Message.Style.Add("color", "#d3d3d3");
                    forumsection.Controls.Add(Div);
                    Message.InnerText = Reader["bericht"].ToString();
                    Div.Controls.Add(User);
                    User.Controls.Add(Button);
                    User.Controls.Add(Username);
                    Div.Controls.Add(Message);
                }
                Reader.Close();
            }
            catch(Exception ex)
            {
                throw ex;
            }
        }

        private void Button_Click(object sender, ImageClickEventArgs e)
        {
            //add your database code to do the DELETE here
            ImageButton btn = (ImageButton)sender;
            var IDtoDELETE = btn.ID.Replace("btnForDBItem_",""); 
            //now call DisplayData() to regenerate the page without the deleted item
            DisplayData();
        }

使用从后面的代码生成的按钮从div中的div删除元素

1 个答案: