Sitefinity 11 无法在前端小部件控件回发时获取下拉选择值 [英] Sitefinity 11 Can't get dropdown selected value on postback in Frontend Widget Control

问题描述

我正在使用 Sitefinity 11.我为新闻模块创建了一个自定义小部件，具有所有可用类别的下拉菜单，我需要在其中过滤所选类别的新闻.控制回发但它的 SelectedIndex 始终为零.

我已选中启用此页面的视图状态"复选框，页面正在使用自定义布局模板.

我的 .aspx 文件中的代码如下:

 <%@ Control Language="C#" %><%@ 导入命名空间="Telerik.Sitefinity.Modules.News" %><%@ 导入命名空间="Telerik.Sitefinity.Taxonomies.Model" %><%@ 导入命名空间="Telerik.Sitefinity.Model" %><%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.ContentUI" Assembly="Telerik.Sitefinity" %><%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.Comments" Assembly="Telerik.Sitefinity" %><%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI" Assembly="Telerik.Sitefinity" %><%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %><%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.PublicControls.BrowseAndEdit" Assembly="Telerik.Sitefinity" %><script type="C#" runat="server">protected void Page_Load(object sender, EventArgs e){如果 (Page.IsPostBack){尝试{var ControlID = Request.Form["__EVENTTARGET"].ToString();控件 postbackControl = Page.FindControl(ControlID);lblStatus.Text = "ControlID=" + ControlID + "
";DropDownList dd = (DropDownList)postbackControl;lblStatus.Text += "SelectedIndex=" + dd.SelectedIndex.ToString();}捕获(异常前){lblStatus.Text += "
"+ ex.Message;}}var s = ddlCategories.SelectedIndex;如果 (!IsPostBack){/* 所有类别的列表 */Telerik.Sitefinity.Taxonomies.TaxonomyManager manager1 = Telerik.Sitefinity.Taxonomies.TaxonomyManager.GetManager();System.Collections.IList categoryList = manager1.GetTaxa().Where(t => t.Taxonomy.Title == "Categories").Select(t =>新 { Id = t.Id, Name = t.Title.ToString() }).OrderByDescending(t => t.Name).ToList();ddlCategories.DataSource = categoryList;ddlCategories.DataTextField = "名称";ddlCategories.DataValueField = "Id";ddlCategories.DataBind();ddlCategories.Items.Insert(0, new ListItem("", ""));}}protected void DdlCategories_SelectedIndexChanged(object sender, EventArgs e){Telerik.Sitefinity.Modules.News.NewsManager newsManager = Telerik.Sitefinity.Modules.News.NewsManager.GetManager();如果(this.ddlCategories.SelectedIndex > 0){//this.FilterExpression += string.Format(" AND Category.Contains(({0}))", this.ddlCategories.SelectedValue.ToString());Guid taxonFilter = new Guid(this.ddlCategories.SelectedValue.ToString());NewsList.DataSource = newsManager.GetNewsItems().Where(newsItem => newsItem.Status == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live&&newsItem.GetValue>("类别").包含(分类过滤器)).ToList();}别的 {NewsList.DataSource = newsManager.GetNewsItems().Where(newsItem => newsItem.Status == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live).ToList();}//填充物品列表//返回 base.GetItemsList(ref totalCount);}<section class="news-container"><div class="容器"><asp:Label ID="lblStatus" runat="server"></asp:Label><!-- 过滤器面板--><div class="filter-panel"><div class="面板框类别"><span class="label">CATEGORIES</span><div class="select-wrp"><asp:DropDownList ID="ddlCategories" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DdlCategories_SelectedIndexChanged"><asp:ListItem></asp:ListItem></asp:DropDownList>

<sf:SitefinityLabel id="title" runat="server" WrapperTagName="div" HideIfNoText="true" HideIfNoTextMode="Server"/><telerik:RadListView ID="NewsList" ItemPlaceholderID="ItemsContainer" runat="server" EnableEmbeddedSkins="false" EnableEmbeddedBaseStylesheet="false"><布局模板><div class="container extra-container2"><div class="row news-post"><asp:PlaceHolder ID="ItemsContainer" runat="server"/>