Question

protected void EventDuration_DDL_SelectedIndexChanged(object sender, EventArgs e)
    {
        con.Open();
        DateTime dt = DateTime.Parse(StartDate_TB.Text);

        int n = Int32.Parse(EventDuration_DDL.SelectedItem.ToString());
        for (int i = 0; i < n; i++)
        {

            Label NewLabel = new Label();
            NewLabel.ID = "Label" + i;
            var eventDate = dt.AddDays(i);
            NewLabel.Text = eventDate.ToLongDateString();

            CheckBox newcheck = new CheckBox();
            newcheck.ID = "CheckBox" + i;
            newcheck.AutoPostBack = true;
            newcheck.CausesValidation = false;
            newcheck.CheckedChanged += new EventHandler(newcheck_CheckedChanged);
            this.Labeldiv.Controls.Add(new LiteralControl("<span class='h1size'>"));
            this.Labeldiv.Controls.Add(NewLabel);
            this.Labeldiv.Controls.Add(new LiteralControl("</span>"));
            this.Labeldiv.Controls.Add(new LiteralControl("<div class='make-switch pull-right' data-on='info'>"));
            this.Labeldiv.Controls.Add(newcheck);
            this.Labeldiv.Controls.Add(new LiteralControl("</div>"));
            this.Labeldiv.Controls.Add(new LiteralControl("<br/>"));
        }

        con.Close();
    }

   protected void Done_Button_Click(object sender, EventArgs e)
    {
      int n = Int32.Parse(EventDuration_DDL.SelectedItem.ToString());
        for (int i = 0; i < n; i++)
        {
            string labelId = "Label" + i.ToString();
            Label NewLabel = (Label)this.Labeldiv.FindControl(labelId);
            string checkBoxId = "Checkbox" + i.ToString();
            CheckBox newcheck = (CheckBox)this.Labeldiv.FindControl(checkBoxId);

            SqlCommand cmd = new SqlCommand("insert into EventDays(EventDay,EventStatus)values(@EventDay,@EventStatus)", con);
            cmd.Parameters.AddWithValue("@EventDay", NewLabel.Text);
            cmd.Parameters.AddWithValue("@EventStatus", newcheck.Checked ? "true" : "false");
            cmd.ExecuteNonQuery();
         }
        con.Close();
    }

我创建了标签＆amp;在EventDuration_DDL_SelectedIndexChanged ......中动态选中复选框。

我想在选中复选框后存储它们.....

但CheckedChange事件未被触发......... ??????

Answer 1

  newcheck .AutoPostBack = true;
  newcheck .CheckedChanged += new EventHandler(CheckBox_CheckedChanged);

这是添加事件处理程序的方法

在代码中更改此行：

 newcheck.CheckedChanged += newcheck_CheckedChanged;

Answer 2

在SelectedIndexChanged中添加复选框并不是一种好方法，尤其是当您需要绑定服务器事件时。因为在页面的“LoadViewState”时它们不可用。

最好的方法是，

添加复选框＆amp;然后，aspx页面中的标签会设置Visible="false"并绑定所需的事件。

然后，您只需设置newCheck.Visible = true

，即可在SelectedIndexCHange事件中更改其可见性

通过这种方式，事件将会触发

未触发动态创建复选框的已检查更改事件

2 个答案: