数据绑定中继器使Repeater加载所有项目两次

时间:2010-09-13 09:09:10

标签: c# .net data-binding repeater

我有一个转发器,我用3个项目绑定一个列表。 databind()被调用一次,我使用调试器检查了这一点。我在这里有一些奇怪的行为,因为Repeater似乎两次遍历这个项目列表。而不是3个项目,我看到转发器将所有内容绑定两次。

    /// <summary>
    /// Handles the Load event of the Page control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
    protected void Page_Load(object sender, EventArgs e)
    {
        Sitecore.Data.Items.Item contextItem = Sitecore.Context.Item;
        Sitecore.Data.Fields.MultilistField thisSnippets = contextItem.Fields["snippets"];
        List<Item>thisSnippetItems = thisSnippets.GetItems().ToList<Item>();

        if (thisSnippetItems.Count > 0)
        {
            rptListRenderer.DataSource = thisSnippetItems;
            rptListRenderer.DataBind();
        }
    }


    /// <summary>
    /// Handles the ItemDataBound event of the rptListRenderer control.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="System.Web.UI.WebControls.RepeaterItemEventArgs"/> instance containing the event data.</param>
    private void rptListRenderer_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
        {
            Item dataItem = (Item)e.Item.DataItem;

            System.Web.UI.WebControls.PlaceHolder phLiContent = (System.Web.UI.WebControls.PlaceHolder)e.Item.FindControl("phLiContent");

            if (phLiContent != null)
            {
                Sitecore.Data.Items.DeviceItem listItemDevice = Sitecore.Context.Database.Resources.Devices["List item"];
                RenderingReference[] renderings = dataItem.Visualization.GetRenderings(listItemDevice, false);

                foreach (RenderingReference rendering in renderings)
                {
                    string strDataSource = dataItem.ID.ToString();
                    rendering.Settings.DataSource = strDataSource;

                    Sublayout thisControl = (Sublayout)rendering.RenderingItem.GetControl(rendering.Settings);           

                    if (blockCounter == 0)
                    {
                        thisControl.Parameters = "class=snippetColHomeFirst";
                    }
                    else
                    {
                        thisControl.Parameters = "class=";
                    }

                    phLiContent.Controls.Add(thisControl);

                    blockCounter++;
                }
            }
        }

repeater html:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="hpSnippetList.ascx.cs" Inherits="Snippets.Sublayouts.hpSnippetList" %>
<%@ Register TagPrefix="sc" Namespace="Sitecore.Web.UI.WebControls" Assembly="Sitecore.Kernel" %>
<asp:repeater id="rptListRenderer" runat="server" EnableTheming="false" EnableViewState="false">
 <itemtemplate>
   <asp:placeholder id="phLiContent" runat="server" />
 </itemtemplate>
</asp:repeater>

有关如何解决此问题的任何建议? 页面加载只调用一次,databind()只调用一次。

2 个答案:

答案 0 :(得分:4)

也许您在其中一个控件的父级中调用了DataBind方法。根据{{​​3}}(DataBind docs):

  

在服务器控件上调用时,这个   方法解析所有数据绑定   服务器控件中的表达式   在任何儿童控制中。

答案 1 :(得分:2)

通常,在!Page.IsPostBack中绑定内容时,您应该检查Page_Load

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        Sitecore.Data.Items.Item contextItem = Sitecore.Context.Item;
        // ... the rest of the code
    }
}

这可能会解决您当前的问题。