Repeater with RadioButtonList的PagedDataSource

Question

我試圖用多頁問題創建一個考試。這些問題是在SQL過程中動態創建的。我在我的aspx頁面中有一個Repeater，在我的代碼隱藏中動態創建了一個RadioButtonList。

<asp:Repeater ID="ExamQuestionsRepeater" OnItemDataBound="RepeaterItemEventHandler" runat="server"> 
      <ItemTemplate> 
       <asp:Label ID="QuestionLabel" runat="server"><b><%# Eval("exm_Question") %></b></asp:Label> 
       <asp:RadioButtonList ID="QuestionsList" runat="server" RepeatDirection="Vertical"> 
       </asp:RadioButtonList> 
      </ItemTemplate> 
      <SeparatorTemplate> 
       <tr> 
        <td><hr class="ExamQuestionsSeparatorTemplate" /></td> 
       </tr> 
      </SeparatorTemplate> 
     </asp:Repeater> 

背後的代碼如下：

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

private void loadQuestions() 
    { 
      DataSet dataSet = getData(); 

      PagedDataSource pagedDS = new PagedDataSource(); 
      pagedDS.DataSource = dataSet.Tables[0].DefaultView; 
      pagedDS.AllowPaging = true; //indicate that data is paged 
      pagedDS.PageSize = 10; //number of questions per page 

      //Edit: I noticed I was setting the page index after I bound the repeater 
      pagedDS.CurrentPageIndex = CurrentPage; 

      ExamQuestionsRepeater.DataSource = pagedDS; 
      ExamQuestionsRepeater.DataBind(); 

      //update previous and next buttons depending on what current page is at 
      updateButtons(); 
     } 

    } 

我使用OnItemDataBound事件在我的中繼器綁定我的動態單選按鈕列表

protected void RepeaterItemEventHandler(object sender, RepeaterItemEventArgs e) 
    { 
     int questionA = 2; 
     int questionB = 3; 

     if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) 
     { 
      RadioButtonList questionsRadioButtonList = (RadioButtonList)e.Item.FindControl("QuestionsList"); 
      DataRow row = ((DataRowView)e.Item.DataItem).Row; 

      if (row.ItemArray[questionA] != null && !String.IsNullOrEmpty(row.ItemArray[questionA].ToString())) 
      { 
       ListItem item = new ListItem(); 
       item.Text = row.ItemArray[questionA].ToString(); 
       item.Value = "A"; 

       questionsRadioButtonList.Items.Add(item); 
      } 
      if (row.ItemArray[questionB] != null && !String.IsNullOrEmpty(row.ItemArray[questionB].ToString())) 
      { 
       ListItem item = new ListItem(); 
       item.Text = row.ItemArray[questionB].ToString(); 
       item.Value = "B"; 
       questionsRadioButtonList.Items.Add(item); 
      } 
     } 
    } 

    protected void NextButton_Click(object sender, EventArgs e) 
    { 
     // Set viewstate variable to the next page 
     CurrentPage += 1; 

     // Reload control 
     loadQuestions(); 
    } 

    protected void PreviousButton_Click(object sender, EventArgs e) 
    { 
     // Set viewstate variable to the previous page 
     CurrentPage -= 1; 

     // Reload control 
     loadQuestions(); 
    } 

我的問題是，當我移至下一頁或點擊前一頁，問題列表總是與前10個問題綁定，並且狀態也不存儲在頁面之間。我錯過了什麼，或者在加載下一個「頁面」時需要做些什麼才能加載下10個項目？

編輯：我得到了下一個項目，以正確加載每個頁面。現在問題是我的視圖狀態不會保存每次列表加載時我的單選按鈕的值。當我使用RepeaterItemEventHandler時，我是否覆蓋它？我應該檢查某種方法嗎？

Answer 1

所以我想我誤解了如何加載控件的選定值。我最終創建了用戶答案的​​列表並將其保存到Session變量中。當我在頁面之間加載問題時，我會檢查問題/答案對是否存在於該會話列表中，然後從那裏加載值。我RepeaterItemEvenHandler看起來像現在這樣和做的伎倆完美：

protected void RepeaterItemEventHandler(object sender, RepeaterItemEventArgs e) 
    { 
     if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) 
     { 
      RadioButtonList questionsRadioButtonList = (RadioButtonList)e.Item.FindControl("QuestionsList"); 
      ExamQuestion exam = (ExamQuestion)e.Item.DataItem); 

      if (!String.IsNullOrEmpty(exam.exm_AnswerA)) 
      { 
       ListItem item = new ListItem(); 
       item.Text = exam.exm_AnswerA; 
       item.Value = "A"; 

       questionsRadioButtonList.Items.Add(item); 
      } 

      //loading the rest of the list items for the radiobuttonlist goes here... 

      //here is where I load the answer into the radio button if it was answered before 
      if (Session["AnswersList"] == null) throw new Exception("Session variable not set properly: AnswersList"); 

      var answers = (List<UserAnswer>)(Session["AnswersList"]); 

      if (answers.FindIndex(a => a.QuestionID == exam.exm_ID.ToString()) > -1) 
      { 
       questionsRadioButtonList.SelectedValue = 
       answers.Find(a => a.exm_QuestionID == exam.exm_ID.ToString()).exm_UserAnswer; 
      } 
     } 
    } 

這是一個簡單的鏈接遵循教程，與如果有人需要那種參考創建我的考試幫助：http://www.asp.net/web-forms/videos/building-20-applications/lesson-12-building-a-quiz-engine-2