c# - 我已经根据 DropDownList 的选择创建了标签和复选框，并且这些值必须在仅签入 sql server 后存储

Question

我已经根据 DropDownList 的选择创建了标签和复选框，并且这些值必须在仅检查到 sql 服务器后存储，请指导我......

SqlCommand cmd2 = new SqlCommand("insert into EventDays(EventDay,EventStatus)values(@EventDay,@EventStatus)"); 
protected void EventDuration_DDL_SelectedIndexChanged(object sender, EventArgs e)
{

        var paramDay = cmd2.Parameters.Add("@EventDay", SqlDbType.DateTime);
        var paramStatus = cmd2.Parameters.Add("@EventStatus", SqlDbType.Int);
        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 = Calendar1.SelectedDate.Date.AddDays(i);
            NewLabel.Text = eventDate.ToLongDateString();
            NewLabel.CssClass = "h1size";

            CheckBox newcheck = new CheckBox();
            newcheck.ID = "CheckBox" + i;
            newcheck.CheckedChanged += new EventHandler(this.CheckBox_CheckedChanged);

            this.Labeldiv.Controls.Add(NewLabel);
            this.Checkboxdiv.Controls.Add(newcheck);
            this.Labeldiv.Controls.Add(new LiteralControl("<br/>"));

            paramDay.Value = eventDate;
            paramStatus.Value = newcheck.Checked ? 1 : 0;



    }
}

private void CheckBox_CheckedChanged(object sender, EventArgs e)
{
    con.Open();
    cmd2.Connection = con;
    cmd2.ExecuteNonQuery();
    con.Close();
}

Answer 1

这一行似乎有一个问题......

int n = Int32.Parse(EventDuration_DDL.SelectedItem.ToString());

“SelectedItem”不会是一个数字 - 您需要获取 SelectedItem 的 VALUE ...

int n = Int32.Parse(EventDuration_DDL.SelectedItem.Value.ToString());