动态添加CheckBoxList和动态获取CheckBoxList的值

 1protected void Page_Load(object sender, EventArgs e)
 2    {
 3        DataSet ds = new DataSet();
 4        SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Questions; Integrated security=true;");
 5        SqlDataAdapter da = new SqlDataAdapter("select * from QuestionTable", conn);
 6        da.Fill(ds, "QuestionTable");
 7
 8        da = new SqlDataAdapter("select * from QuestionOpiton", conn);
 9        da.Fill(ds, "QuestionOpiton");

        if (ds != null && ds.Tables["QuestionTable"].Rows.Count > 0)
        {
            int i = 0;
            HiddenField1.Value = "";
            foreach (DataRow row in ds.Tables["QuestionTable"].Rows)
            {
                DataRow[] rows = ds.Tables["QuestionOpiton"].Select("QuestionId = " + row["QuestionId"].ToString() + "");

                if (row["QuestinType"].ToString().Equals("1"))
                {
                    Label labl = new Label();
                    labl.Text = row["QuestionContent"].ToString();
                    div1.Controls.Add(labl);
                    CheckBoxList chkbox = new CheckBoxList();

                    string clientid = "chk" + i.ToString();
                    HiddenField1.Value += clientid + ",";
                    chkbox.ID = clientid;

                    foreach (DataRow row2 in rows)
                    {
                        ListItem item = new ListItem();

                        item.Text = row2["QuestionOpitonType"].ToString() + ":  " + row2["QuestionOpitonName"].ToString();
                        item.Value = row2["QuestionOptionId"].ToString();
                        chkbox.Items.Add(item);
                        div1.Controls.Add(chkbox);
                        if (IsPostBack) break; //关键在这里，
                                               //因为点击按钮要再次添加才能再次取到控件，
                                               //所以再添加 一次后就让他跳出循环
                                               //这样就不会在点击按钮后这个CheckBoxList 里有重复项了
                                               
                    }
                }
                i++;
            }
            if (!IsPostBack)
            {
                if (HiddenField1.Value.IndexOf(",") > -1)
                {
                    HiddenField1.Value = HiddenField1.Value.Remove(HiddenField1.Value.Length - 1);
                }
            }
        }


    }



protected void Button1_Click(object sender, EventArgs e)
    {
        string strChkBoxNams = HiddenField1.Value;
        string strValue = string.Empty;
        if (strChkBoxNams.IndexOf(",") > 0)
        {
            string[] chkBox = strChkBoxNams.Split(',');
            foreach (string chk in chkBox)
            {
                if (!string.IsNullOrEmpty(chk))
                {
                    CheckBoxList chkBoxList = (CheckBoxList)FindControl(chk);

                    foreach (ListItem item in chkBoxList.Items)
                    {
                        if (item.Selected)
                        {
                            strValue += item.Value + ",";
                        }
                    }
                }
            }
            strValue = strValue.Remove(strValue.Length - 1);
        }
        else if (strChkBoxNams.Length > 0)
        {
            CheckBoxList chkBoxList = (CheckBoxList)FindControl(strChkBoxNams);

            foreach (ListItem item in chkBoxList.Items)
            {
                if (item.Selected)
                {
                    strValue += item.Value + ",";
                }
            }
            strValue = strValue.Remove(strValue.Length - 1);
        }
        Response.Write(strValue);
    }