下拉列表未出現在表格中

Question

我正在將一系列從數據庫填充的下拉列表添加到代碼後面的頁面中。因爲我需要可變數量的部分，每部分都包含可變數量的下拉列表，所以我不得不運行我的查詢，然後將構建並將HTML直接放到頁面上。我相信有一個更好的方法來做到這一點（可能嵌套中繼器），但它是工作。我的HTML是：

Question 

<input type='hidden' id='h100' /> 
    <select id='q100'> 
     <option>Answer 1</option> 
     <option>Answer 2</option> 
     <option>Answer 3</option> 
    </select> 

但是，當頁面POST回來，我沒有得到這些表單集合中的字段。這很奇怪，因爲他們昨天似乎在那裏，但是我回到頁面並找不到它們。

爲什麼這些不會出現在POST表單集合後？

我使用C＃代碼後面，任何幫助，非常感謝。

編輯：這是我背後的代碼（請不要傷害我，我正在學習ASP.NET，因爲我去）：

if (!Page.IsPostBack) 
    { 
     // Much stuff that works fine, connecting to database, etc. 

      // Get matching questions - variables 
      ArrayList matchingSections = new ArrayList(); 
      int matchingSectionCount; 

      // Get count of matching sections 
      OracleCommand cmdMatchSectCount = new OracleCommand("Select Count(distinct matching_section) From graphite.question Join graphite.q_matching Using(q_id) Where t_id = " + Session["TestTaking"].ToString(), conn); 
      OracleDataReader drMatchSectCount = cmdMatchSectCount.ExecuteReader(); 
      drMatchSectCount.Read(); 
      matchingSectionCount = (int)drMatchSectCount.GetOracleNumber(0).Value; 
      Session["MatchingSectionCount"] = matchingSectionCount; 

      // Get matching sections 
      OracleCommand cmdMatchSects = new OracleCommand("Select Distinct matching_section From graphite.question Join graphite.q_matching Using(q_id) Where t_id = " + Session["TestTaking"].ToString() + " Order By matching_Section", conn); 
      OracleDataReader drMatchSects = cmdMatchSects.ExecuteReader(); 

      for(int i = 0; i < matchingSectionCount; i++) 
      { 
       drMatchSects.Read(); 
       matchingSections.Add(drMatchSects.GetOracleString(0).Value); 
      } 

      foreach (String s in matchingSections) 
      { 
       string row = string.Empty; 
       int questionCount; 
       ArrayList answers = new ArrayList(); 

       matchManual.InnerHtml += "\n<h2>Matching Section - " + s + "</h2>"; 
       matchManual.InnerHtml += "\n<table>"; 

       OracleCommand cmdQuestionCount = new OracleCommand("Select Count(correct_answer) From graphite.question Join graphite.q_matching Using(q_id) Where t_id = " + Session["TestTaking"].ToString() + " and matching_section = '" + s + "'", conn); 
       OracleDataReader drQuestionCount = cmdQuestionCount.ExecuteReader(); 
       drQuestionCount.Read(); 
       questionCount = int.Parse(drQuestionCount.GetOracleNumber(0).Value.ToString()); 

       OracleCommand cmdMatchAnswers = new OracleCommand("Select correct_answer From graphite.question Join graphite.q_matching Using(q_id) Where t_id = " + Session["TestTaking"].ToString() + " and matching_section = '" + s + "' Order By correct_answer", conn); 
       OracleDataReader drMatchAnswers = cmdMatchAnswers.ExecuteReader(); 
       for (int i = 0; i < questionCount; i++) 
       { 
        drMatchAnswers.Read(); 
        answers.Add(drMatchAnswers.GetOracleString(0).Value.ToString()); 
       } 

       OracleCommand cmdMatchLoop = new OracleCommand("Select q_phrase, q_id From graphite.question Join graphite.q_matching Using(q_id) Where t_id = " + Session["TestTaking"].ToString() + " and matching_section = '" + s + "'", conn); 
       OracleDataReader drMatchLoop = cmdMatchLoop.ExecuteReader(); 
       for (int i = 0; i < questionCount; i++) 
       { 
        drMatchLoop.Read(); 
        row += "\n <tr>"; 
        row += "\n <td>" + drMatchLoop.GetOracleString(0).Value ; 

        row += "<input type='hidden' id='h" + drMatchLoop.GetOracleNumber(1).Value.ToString() + "' />"; 
        row += "\n </td>"; 
        row += "\n <td>"; 
        row += "\n  <select id='q" + drMatchLoop.GetOracleNumber(1).Value.ToString() + "' runat='server'>"; 

        foreach(string answer in answers) 
        { 
         row += "\n  <option>" + answer + "</option>"; 
        } 

        row += "\n  </select>"; 
        row += "\n </td>"; 

        row += "\n </tr>"; 
       } 

       matchManual.InnerHtml += row; 
       matchManual.InnerHtml += "\n</table>\n\n"; 
    } 

Answer 1

哇。只是......哇。與<select>，你必須包括一個name='value'，而不是id='value'。道德：瞭解你的HTML。並且儘量設法避免將原始HTML分發到頁面上。

Answer 2

我認爲你Page.IsPostBack條件是問題根源。因爲您僅在！IsPostback =>上生成元素，只在'第一次'時生成元素，而不是在post =>之後生成元素。

Answer 3

如果它們在提交時不在formcollection中，我認爲問題在於它們不在被子引用的表單標籤內，或者您必須創建表單標籤並將select標籤放入其中。

@edited

啊哈 - 所以這是一個形式中，看到現在的原因是在選擇標籤丟失的name屬性！

表單集合在發佈時使用屬性名稱值作爲鍵。