我对asp.net checkboxlist有疑问。未插入复选框选定项目 [英] I have doubt in asp.net checkboxlist. the checkbox selected item is not inserted

问题描述

我对asp.net checkboxlist有疑问。复选框选中项目未插入.....这是我的代码...

I have doubt in asp.net checkboxlist. the checkbox selected item is not inserted..... this is my code...

protected void Page_Load(object sender, System.EventArgs e)
        {
              string query;
              using (SqlConnection con = new SqlConnection(CS))
              {
                try
                {
            
            query="SELECT distinct[username] FROM [Login]";
            con.Open();
            SqlDataAdapter da=new SqlDataAdapter(query,con);
            DataSet ds=new DataSet();
            da.Fill(ds);
            if(ds.Tables[0].Rows.Count!=0)
            {
                CheckBoxList1.DataSource=ds;
                CheckBoxList1.DataTextField="username";
                CheckBoxList1.DataValueField="username";
                CheckBoxList1.DataBind();
            }
            else
            {
                Response.Write("No Results found");
            }

        }
        catch(Exception ex)
        {
            Response.Write("<br>"+ex);
        }
        finally
        {
         //   con.Close();
        }
       }
    }

        protected void send_Click(object sender, EventArgs e)
        {
            foreach(ListItem item in CheckBoxList1.SelectedValue.ToString())
            //foreach (ListItem item in CheckBoxList1.Items)
            {
                if (item.Selected)
                {
                    using (SqlConnection con = new SqlConnection(CS))
                    {
                        con.Open();
                        using (SqlCommand cmd = new SqlCommand())
                        {
                            cmd.Connection = con;
                            cmd.CommandType = CommandType.Text;
                            
                            cmd.CommandText = "INSERT INTO Calendar (schdlby, schdldate, schdltime, event, parti ) values (@schdlby, @schdldate, @schdltime, @event, @parti)";
                            cmd.Parameters.AddWithValue("@schdlby", Page.User.Identity.Name.ToString());
                            cmd.Parameters.AddWithValue("@schdldate", cl.SelectedDate.ToShortDateString());
                            cmd.Parameters.AddWithValue("@schdltime", schdltime.Text.Trim());
                            cmd.Parameters.AddWithValue("@event", txtevent.Text);
                            cmd.Parameters.AddWithValue("@parti", item.Value.ToString());
                            // cmd.Parameters.AddWithValue("@parti", item.Selected.ToString());
                            cmd.ExecuteNonQuery();
                       }
                    }
                }      
            }
          
         //   Response.Redirect("Second.aspx");
        }

推荐答案

你是每次页面加载时重新绑定控件。这将清除所有选定的项目。



将数据绑定代码包装在 if（！IsPostBack）{...} block。

You are re-binding the control every time the page loads. This will clear out any selected items.

Wrap the data-binding code in a if (!IsPostBack) { ... } block.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindCheckBoxList();
    }
}

private void BindCheckBoxList()
{
    using (SqlConnection con = new SqlConnection(CS))
    using (SqlCommand command = new SqlCommand("SELECT DISTINCT [username] FROM [Login]", con))
    {
        SqlDataAdapter da = new SqlDataAdapter(command);
        DataSet ds = new DataSet();
        da.Fill(ds);
        
        CheckBoxList1.DataSource = ds;
        CheckBoxList1.DataTextField = "username";
        CheckBoxList1.DataValueField = "username";
        CheckBoxList1.DataBind();
    }
}

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