複選框類型轉換

Question

我正在使用Visual Studio 2010與C＃。

我有一個問題，在我的ascx頁面一個我創建了一個複選框列如下：

<asp:TemplateField ItemStyle-HorizontalAlign="left" HeaderStyle-HorizontalAlign="Left" HeaderText="Beetald"> 
    <HeaderTemplate> 
     <input type="checkbox" id="selectallTeachers" class="selectallTeachers" onclick="javasctipt:SelectheaderCheckboxesTeacher();" /> 
    </HeaderTemplate> 
    <ItemTemplate> 
     <input type="checkbox" id="chkPaid" class="caseTeacher" name="caseTeacher" runat="server" /> 
    </ItemTemplate> 
</asp:TemplateField> 

我創建的JavaScript這樣的：

<script type="text/javascript"> 
    // Select/Deselect checkboxes based on header checkbox 
    function SelectheaderCheckboxesTeacher() { 
     if ($("#selectallTeachers").val() == 'on') { 
      $('.caseTeacher').attr('checked', 'checked'); 
      $("#selectallTeachers").val('off'); 
     } 
     else if ($("#selectallTeachers").val() == 'off') { 
      $('.caseTeacher').removeAttr("checked"); 
      $("#selectallTeachers").val('on'); 
     } 

     $(".caseTeacher").click(function() { 
      if ($(".caseTeacher").length == $(".caseTeacher:checked").length) { 
       $("#selectallTeachers").attr("checked", "checked"); 
       $("#selectallTeachers").val('off'); 
      } else { 
       $("#selectallTeachers").removeAttr("checked"); 
       $("#selectallTeachers").val('on'); 
      } 
     }); 
    } 
    // if all checkbox are selected, check the selectallTeachers checkbox 
    // and viceversa 
</script> 

對於ButtonClick事件我這樣寫：

protected void btnDeleteSelectedMessages_Click(object sender, EventArgs e) 
{ 
    if (currentGridView == null) 
     setCurrentGridView(); 

    //controleer voor elke rij welke checkbox is geselecteerd 
    foreach (GridViewRow row in currentGridView.Rows) 
    { 
     CheckBox cb = (CheckBox)row.FindControl("chkPaid"); 
     Guid messageID = (Guid)currentGridView.DataKeys[row.DataItemIndex].Value; 

     //als de checkbox is geselecteerd het bericht verwijderen 
     if (cb != null && cb.Checked) 
     { 
      if (currentGridView.ID.Equals("Messages")) 
       b.BussinesMessageReceiver.DeleteMessageReceiver(messageID, MessageBoxPerson); 
      else if (currentGridView.ID.Equals("MessagesSent")) 
       b.BussinesMessage.DeleteMessageSender(messageID); 
      else //MessagesDeleted 
       b.BussinesMessage.DeleteMessage(messageID, (Page.Server.MapPath("~/Upload/") + messageID)); 
      continue; 
     } 
    } 
    btnDeleteSelectedMessages.Enabled = false; 
    selectLocation.Visible = false; 
    clearSelectedMessageSession(); 

    //Update the GridView 
    BindGridView(); 
} 

它顯示就行了錯誤

CheckBox cb = (CheckBox)row.FindControl("chkPaid"); 

，因爲我已經輸入類型的複選框創建不直接。

Answer 1

的input type="checkbox"不是CheckBox。所以你應該把它改爲HtmlInputCheckBox（或使用CheckBox）。

var cb = (HtmlInputCheckBox)row.FindControl("chkPaid");