Repeater的SeparatorTemplate与Eval

问题描述

可以在Repeater的SeparatorTemplate中使用Eval或类似的语法吗？

is it possible to use Eval or similar syntax in the SeparatorTemplate of a Repeater?

Id'喜欢在分隔符模板中显示最后一个项目的某些信息，如这个：

Id' like to display some info of the last item in the separator template like this:

<table>
    <asp:Repeater>
        <ItemTemplate>
            <tr>
                <td><%# Eval("DepartureDateTime") %></td>
                <td><%# Eval("ArrivalDateTime") %></td>
            </tr>
        </ItemTemplate>
        <SeparatorTemplate>
            <tr>
                <td colspan="2">Change planes in <%# Eval("ArrivalAirport") %></td>
            </tr>
        </SeparatorTemplate>
    <asp:Repeater>
<table>

希望它会产生这样的东西：

Hopping that it'll generate something like this:

<table>
    <asp:Repeater>
            <tr>
                <td>2009/01/24 10:32:00</td>
                <td>2009/01/25 13:22:00</td>
            </tr>
            <tr>
                <td colspan="2">Change planes in London International Airport</td>
            </tr>
            <tr>
                <td>2009/01/25 17:10:00</td>
                <td>2009/01/25 22:42:00</td>
            </tr>
    <asp:Repeater>
<table>

但是SeparatorTemplate似乎忽略了Eval（）调用。我尝试使用以前的语法：<％＃DataBinder.Eval（Container.DataItem，ArrivalAirport）％>具有相同的结果。

But the SeparatorTemplate seems to be ignoring the Eval() call. I tried using also the previous syntax like this: <%# DataBinder.Eval(Container.DataItem, "ArrivalAirport")%> with the same results.

是吗可能在SeparatorTemplate中显示上一个项目的信息？如果没有，你可以建议另一种方法来生成这个代码吗？

Is it possible to display information of the previous item in a SeparatorTemplate? If not, can you suggest an alternative way to generate this code?

谢谢

推荐答案

尝试这样：

在您的WebForm类中添加一个私有变量（或两个），您可以使用它来增加/跟踪哪些航班信息而您在项目级别执行数据绑定。

Add a private variable (or two) in the class of your WebForm that you can use to increment/track what the flight information is while you are performing your databinding at the item level.

然后在ItemDatabound事件中，如果数据绑定的项目是ListItemType.Seperator类型，则可以执行简单的评估，显示/隐藏/修改您的分隔符代码。

Then in the ItemDatabound event, you can perform a simple evaluation if the item being databound is the ListItemType.Seperator type and display/hide/modify your seperator code that way.

您的WebForm页面将在顶部看起来像这样：

Your WebForm page would look something like this at the top:

public partial class ViewFlightInfo : System.Web.UI.Page
{

    private int m_FlightStops;

    protected page_load
    {

        // Etc. Etc.

    }
}

然后当您下达数据绑定时：

Then when you get down to your data binding:

protected void rFlightStops_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    Repeater rFlightStops = (Repeater)sender;

    if (e.Item.ItemType == ListItemType.Header)
    {
        // Initialize your FlightStops in the event a new data binding occurs later. 
           m_FlightStops = 0;
    }

    if (e.Item.ItemType == ListItemType.Item
        || e.Item.ItemType == ListItemType.AlternatingItem)
    {
         // Bind your Departure and Arrival Time
         m_FlightStops++;
     }

    if (e.Item.ItemType == ListItemType.Seperator)
    {
       if (m_FlightStops == rFlightStops.Items.Count - 1)
       {
           PlaceHolder phChangePlanes = 
                    (PlaceHolder)e.Item.FindControl("phChangePlanes");
           phChangePlanes.Visible = false;
       }
    }
 }

...或某事这个效果。

...or something to this effect.

这篇关于Repeater的SeparatorTemplate与Eval的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！