从 <%# %> 获取值

Question

<cms:CMSRepeater ID="rptTopic" runat="server" SelectOnlyPublished="true" OrderBy="NodeLevel,NodeOrder" ClassNames='<%# CLASS_NAME %>' Path='<%# Path %>'>

CLASS_NAME 和 Path 的值是在后端预定义的。但我仍然遇到错误。

我的代码有什么问题吗？

下面是全部代码。

    <cms:CMSRepeater ID="CMSRepeater1" runat="server" SelectOnlyPublished="true" OrderBy="NodeLevel,NodeOrder" ClassNames='<%# CLASS_NAME %>' Path='<%# Path %>'>
        <ItemTemplate>
            <div class="col-md-3">
                <div class="panel panel-default">
                    <asp:Image ID="imgTopic" runat="server" Height="200px" Width="100%" ImageUrl='<%# Eval("BackgroundImage") %>' />
                    <h4><%# Eval("Title") %></h4>
                    <p><%# Eval("Descriptions") %></p>
                    <a class="btn" href='<%# Eval("UrlLink") %>'>
                        <%# Eval("UrlText") %>
                    </a>
                </div>
            </div>
        </ItemTemplate>
    </cms:CMSRepeater>

这是我遇到的异常：

Message: DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'BackgroundImage'.

Exception type: System.Web.HttpException
Stack trace: 
at System.Web.UI.DataBinder.GetPropertyValue(Object container, String propName)
at System.Web.UI.DataBinder.Eval(Object container, String[] expressionParts)
at System.Web.UI.DataBinder.Eval(Object container, String expression)
at System.Web.UI.TemplateControl.Eval(String expression)
at CMS.Base.Web.UI.AbstractUserControl.Eval(String column)
at ASP.inteksoft_webparts_content_topiclisting_ascx.__DataBinding__control3(Object sender, EventArgs e) in C:\Users\yjseow\Desktop\inteksoft svn\trunk\MOT\MOT.Website\Website\CMS\Inteksoft\WebParts\Content\TopicListing.ascx:line 9
at System.Web.UI.Control.OnDataBinding(EventArgs e)
at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
at System.Web.UI.Control.DataBind()
at System.Web.UI.Control.DataBindChildren()
at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
at System.Web.UI.Control.DataBind()
at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem)
at System.Web.UI.WebControls.Repeater.AddDataItemsIntoItemsArray(IEnumerable dataSource, Boolean useDataSource)
at System.Web.UI.WebControls.Repeater.PostGetDataAction(IEnumerable dataSource)
at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource)
at CMS.DocumentEngine.Web.UI.BasicRepeater.CreateControlHierarchy(Boolean useDataSource)
at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.Repeater.DataBind()
at CMS.DocumentEngine.Web.UI.BasicRepeater.DataBind()
at CMS.DocumentEngine.Web.UI.CMSRepeater.DataBind()
at CMS.DocumentEngine.Web.UI.CMSRepeater.ReloadDataInternal(Boolean forceReload)
at CMS.DocumentEngine.Web.UI.CMSRepeater.<>c__DisplayClass3.b__2()
at CMS.Base.Web.UI.ControlsExtensions.CallHandled(Control ctrl, Action func)

根据我得到的异常，在我检查我的列字段名称是否正确后，我怀疑我无法指向正确的 class 名称。

一旦我从 ClassNames='<%# CLASS_NAME %>' Path='<%# Path %>'> 切换到 ClassNames="CMS.Topic" Path="/Shared/Topic/%"，那么一切顺利。

我正在努力使 ClassNames 和 Path 变得动态可控。

Answer 1

下次从事件日志中添加日志。尝试：

<cms:CMSRepeater ID="rptTopic" runat="server" SelectOnlyPublished="true" OrderBy="NodeLevel,NodeOrder" ClassNames='<%# CLASS_NAME %>' Path='<%# Path %>' />

注意括号结束前的斜杠字符。

编辑：尝试使用

<%# Eval("ClassName")%>

Answer 2

如果 CLASS_NAME 和 Path Path 是代码隐藏文件中的属性，您可以尝试在页面加载时在代码隐藏文件中使用它们初始化转发器。喜欢 rptTopic.ClassNames = CLASS_NAME; 和 rptTopic.Path = Path。或者使用 <%=...%> 代替 <%#...%>

<cms:CMSRepeater ID="CMSRepeater1" runat="server" SelectOnlyPublished="true" OrderBy="NodeLevel,NodeOrder" ClassNames='<%= CLASS_NAME %>' Path='<%= Path %>'/>

Answer 3

由于注释不能包含代码标签，如果你需要设置一个 Repeater 的值超过你在 inline 标签中所能做的，你可以这样做：

<cms:CMSRepeater ID="rptTopic" runat="server" SelectOnlyPublished="true" OrderBy="NodeLevel,NodeOrder" />
<script runat="server">
    protected override void OnInit(EventArgs e)
    {
        rptTopic.ClassName = CMS.Helpers.ValidationHelper.GetString(Eval("ClassName"),"");
        rptTopic.Path = CMS.Helpers.ValidationHelper.GetString(Eval("Path"),""); 
    }
</script>

从 <%# %> 获取值

Getting value from <%# %>

kentico