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POc#.NET ListBox with dynamic data and multiselection problem
 

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  1. POc#.NET ListBox with dynamic data and multiselection problem
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    <p>Im trying to get values from a <code>ListBox</code> that has multiselection and dynamic ListItems in it. My problem is that I can't get the values once I press my "assign" button.</p> <p>The idea is that I have like 10-15 listitems and they should be assigned with values. And I want to be able to select like 5 of them and press my assign button and then continue to assign other values to these items left in the list.</p> <p>For som reason my <code>ListBox.Item.Count</code> always returns like 1 row.</p> <p><em><strong>Question: Is there something you need to think about when using <code>ListBox</code> in .NET 4.0 that isn't obvious?</em></strong></p> <p>Parts of the code</p> <p>Front:</p> <pre><code> &lt;fieldset&gt; &lt;legend&gt; &lt;asp:Label ID="Label1" runat="server" Text="&lt;%$ Resources:lang, ExtensionsTitleAB %&gt;"&gt;&lt;/asp:Label&gt; &lt;/legend&gt; &lt;div class="extLeft"&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:Label ID="Label5" runat="server" Text="&lt;%$ Resources:lang, ExtensionsTmNumber %&gt;"&gt;&lt;/asp:Label&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox runat="server" ID="txtTmNumber"&gt;&lt;/asp:TextBox&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:Label ID="Label6" runat="server" Text="&lt;%$ Resources:lang, ExtensionsTmName %&gt;"&gt;&lt;/asp:Label&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox runat="server" ID="txtTmName"&gt;&lt;/asp:TextBox&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:Label ID="Label7" runat="server" Text="&lt;%$ Resources:lang, ExtensionsTmRegistered %&gt;"&gt; &lt;/asp:Label&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox runat="server" ID="txtTmRegistered"&gt;&lt;/asp:TextBox&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:Label ID="Label8" runat="server" Text="&lt;%$ Resources:lang, ExtensionsTmLocality %&gt;"&gt; &lt;/asp:Label&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox runat="server" ID="txtTmLocality"&gt;&lt;/asp:TextBox&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;asp:Label ID="Label9" runat="server" Text="&lt;%$ Resources:lang, ExtensionsMemberShipId %&gt;"&gt; &lt;/asp:Label&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox runat="server" ID="txtMembershipIdFaseOne"&gt; &lt;/asp:TextBox&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;div class="extMiddle"&gt; &lt;asp:Button runat="server" ID="btnAssignAB" OnClick="btnAssign_Click" Text="&lt;%$ Resources:lang, ButtonAssignExtensions %&gt;" /&gt; &lt;/div&gt; &lt;div class="extRight"&gt; &lt;p&gt;&lt;asp:Label ID="Label4" runat="server" Text="&lt;%$ Resources:lang, ExtensionsListHelp %&gt;"&gt; &lt;/asp:Label&gt; &lt;/p&gt; &lt;asp:ListBox runat="server" ID="listABContainer" SelectionMode="Multiple" AutoPostBack="false"&gt; &lt;/asp:ListBox&gt; &lt;/div&gt; &lt;/fieldset&gt; </code></pre> <p>The codebehind:</p> <pre><code>public partial class extensions : System.Web.UI.Page { private model.OrderHandling orderHandling; protected void Page_Load(object sender, EventArgs e) { if (Session["dataobject"] != null) { orderHandling = (OrderHandling)Session["dataobject"]; } else { String url = "http://" + Request.Url.Authority + "/Default.aspx"; Response.Redirect(url); } if (!IsPostBack) { addListItems(); } } private void addListItems() { foreach (OrderLine line in orderHandling.order.getOrderLines()) { if (line.price.getPriceType().Equals(Price_Types.SUNRISE_ONE) || line.price.getPriceType().Equals(Price_Types.SUNRISE_TWO)) { listABContainer.Items.Add( new ListItem(line.domain.domainName, line.domain.domainName)); System.Diagnostics.Debug.WriteLine("added a domain " + "to list listABContainer : " + line.domain.domainName); } else if (line.price.getPriceType().Equals(Price_Types.LANDRUSH) || line.price.getPriceType().Equals(Price_Types.GENERAL)) { listCDContainer.Items.Add( new ListItem(line.domain.domainName, line.domain.domainName)); System.Diagnostics.Debug.WriteLine("added a domain " + "to list listCDContainer : " + line.domain.domainName); } } } protected void btnAssign_Click(object sender, EventArgs e) { assignTMExtensions(); } private bool assignTMExtensions() { bool success = true; TradeMarkExtension tmExt = new TradeMarkExtension(); String errorMsg = ""; if (!String.IsNullOrEmpty(txtTmNumber.Text) &amp;&amp; tmExt.isValid(EXTENSION_KEYS.TM_NUMBER, txtTmNumber.Text, null)) { tmExt.setExtension(EXTENSION_KEYS.TM_NUMBER, txtTmNumber.Text); } if (success) { System.Diagnostics.Debug.WriteLine("Succes: time for domainExtension, listCount : " + listABContainer.Items.Count); foreach (ListItem list in listABContainer.Items) { if (list.Selected) { System.Diagnostics.Debug.WriteLine("Found a selected item " + list.Value); try { OrderLine ol = orderHandling.order.getOrderLine(list.Value); ol.domain.addExtension(tmExt); System.Diagnostics.Debug.WriteLine("Addedd domainExtension"); } catch (Exception e) { System.Diagnostics.Debug.WriteLine("FAILED domainExtension"); showError.Text = "An exception has occured. Please reload the page and try again."; return false; } } } Session["dataobject"] = orderHandling; removeListItems(listABContainer); } else { showError.Text = errorMsg; } return success; } private void removeListItems(ListBox list) { int i = 0; while(i &lt; list.Items.Count) { if (list.Items[i].Selected) { list.Items.RemoveAt(i); } i++; } } } </code></pre>
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