Question

它没有显示错误，

但是这些值没有插入到sql server中.....

我们如何从EventDuration_DDL_SelectedIndexChanged（）

访问Wizard_buttonClick（）中动态生成的标签和复选框？

    protected void EventDuration_DDL_SelectedIndexChanged(object sender, EventArgs e)
    {
        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();

            CheckBox newcheck = new CheckBox();
            newcheck.ID = "CheckBox" + i;
            newcheck.CheckedChanged += new EventHandler(this.CheckBox_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/>"));
        }  
    }

    protected void Wizard1_FinishButtonClick(object sender, WizardNavigationEventArgs e)
    {
        con.Open();

        var label = Labeldiv.FindControl("Label1") as Label;
        var checkbox = Labeldiv.FindControl("CheckBox1") as CheckBox;
        using (SqlCommand cmd2 = new SqlCommand("insert into EventDays(EventDay,EventStatus)values(@EventDay,@EventStatus)", con))
        {
            var paramDay = cmd2.Parameters.Add("@EventDay", SqlDbType.DateTime);
            var paramStatus = cmd2.Parameters.Add("@EventStatus", SqlDbType.Int);
            if (label != null)
            {
                paramDay.Value = label;
                paramStatus.Value = checkbox.Checked ? 1 : 0;
                cmd2.ExecuteNonQuery();

            }
        }
        con.Close();
    }

Answer 1

显示错误是因为您在循环中多次添加参数。参数名称必须是唯一的更改代码，以便从循环中创建参数，并在循环中设置值：

using (SqlCommand cmd2 = new SqlCommand("insert into EventDays(EventDay,EventStatus)values(@EventDay,@EventStatus)", con))
{
    var paramDay = cmd2.Parameters.Add("@EventDay", SqlDbType.DateTime);
    var paramStatus = cmd2.Parameters.Add("@EventStatus", SqlDbType.Int);
    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;

        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;
        cmd2.ExecuteNonQuery();
    }
}

该示例假定EventDate是DateTime而EventStatus是Int，您可能需要调整数据类型。根据执行命令的次数，您可以在添加参数后运行cmd2。Prepare（）。
此外，using语句确保以适当的方式处理SqlCommand对象。

Answer 2

如果移动

怎么办？

SqlCommand cmd2 = new SqlCommand("insert into EventDays(EventDay,EventStatus)values(@EventDay,@EventStatus)", con);

在循环内？

更改

cmd2.Parameters.AddWithValue("@EventStatus", newcheck.Checked ?? 1:0);

如何在asp.net c＃中将动态创建的标签文本插入sql server

2 个答案: