更新面板问题

Question

我有一段代码，它根据问题类型生成一个新问题，并在每次用户单击next按钮时使用新问题更新asp.net更新面板。我的问题是，当我单击next时，如何获得用户当前所在问题的响应。更具体地说，当单击下一个并加载新面板时，如何从更新面板读取前一个值。

    public static int incremental = 0; 
    protected void Page_Load(object sender, EventArgs e)
    {
        UpdateButton2.Text = "Start the Pre-Assessment";

    }

    protected void UpdateButton_Click(object sender, EventArgs e)
    {
        COPDEntities1 copdContext = new COPDEntities1();
        UpdateButton2.Text = "NEXT"; 
        var questions = (from p in copdContext.Questions select p).ToList();
        if (incremental == questions.Count)
            {
                incremental = 0; 

             }

            DateTimeLabel2.Text = questions[incremental].QuestionText;

            if (questions[incremental].QuestionAnswerTypeID == 1)
            {
                RadioButtonList choices = new RadioButtonList();
                choices.ID = "choices";

                choices.ID = Convert.ToString(1);
                choices.Items.Add(new ListItem("True", "0"));
                choices.Items.Add(new ListItem("False", "1"));
                pnlChoice.Controls.Add(choices);
            }
            if (questions[incremental].QuestionAnswerTypeID == 2)
            {
                TextBox text = new TextBox();
                text.ID = "choices";
                pnlChoice.Controls.Add(text);


            }
            if (questions[incremental].QuestionAnswerTypeID == 3)

            {
                int questID = questions[incremental].QuestionID;
                var responses = (from r in copdContext.QuestionResponses where r.QuestionID == questID select r).ToList();

                RadioButtonList choices = new RadioButtonList();
                choices.ID = "choices";
                choices.ID = Convert.ToString(3);
                foreach(var choice in responses)
                {     
                      int choiceID= choice.ResponseID;
                      var multchoices = (from c in copdContext.Responses where c.ResponseID == choiceID select c).FirstOrDefault();
                      choices.Items.Add(new ListItem(multchoices.ResponseLongdescription, Convert.ToString(multchoices.ResponseID)));

                }




                pnlChoice.Controls.Add(choices);
               // Label1.Text = Convert.ToString(responses[0].ResponseID); 


            }
            if (questions[incremental].QuestionAnswerTypeID == 4)
            {
                int questID = questions[incremental].QuestionID;
                var responses = (from r in copdContext.QuestionResponses where r.QuestionID == questID select r).ToList();

                CheckBoxList choices = new  CheckBoxList();
                choices.ID = "choices";
                choices.ID = Convert.ToString(3);
                foreach (var choice in responses)
                {
                    int choiceID = choice.ResponseID;
                    var multchoices = (from c in copdContext.Responses where c.ResponseID == choiceID select c).FirstOrDefault();
                    choices.Items.Add(new ListItem(multchoices.ResponseLongdescription, Convert.ToString(multchoices.ResponseID)));

                }
                pnlChoice.Controls.Add(choices);
            }
            if (questions[incremental].QuestionAnswerTypeID == 5)
            {
                TextBox text = new TextBox();
                text.ID = "choices";
                pnlChoice.Controls.Add(text);

            }
            if (questions[incremental].QuestionAnswerTypeID == 6)
            {


            }
            if (questions[incremental].QuestionAnswerTypeID == 7)
            {
                RadioButtonList choices = new RadioButtonList();


            }
            incremental++; 

    }
}

Answer 1

单击按钮时，不要创建单选按钮或复选框。在VS页面设计器或preinit中创建它们，否则它将不会存储在视图状态中，您将无法获取它。在dsigner或preinit中创建控件后，根据您的问题类型显示/隐藏/设置它们的值。这样，您就可以获得以前控件(基本上是当前控件)的值。否则，您可以使用传统的requst"id“方式获取数据，但这将是混乱的。

Answer 2

尝试使用MultiView并定义所有可能的视图，而不是动态创建控件并将其添加到面板中：

<asp:MultiView id="MyMultiView" runat="server">
   <asp:View id="FirstView" runat="server">
   <!-- Markup for the first view -->
   </asp:View>
   <asp:View id="SecondView" runat="server">
   <!-- Markup for the second view -->
   </asp:View>
   <asp:View id="ThirdView" runat="server">
   <!-- Markup for the third view -->
   </asp:View>
</asp:MultiView>

然后，从按钮上的代码隐藏中，单击“事件”，将活动视图切换到所需的视图。这样，您将能够获取任何控件的值，无论它是否在活动视图中。