在ASP.NET嵌套中继器 [英] Nested Repeaters in ASP.NET

问题描述

我有一个包含分层数据的类。我使用嵌套中继器要present这个数据在我的ASP.net web应用程序。我该怎么做呢？我只做过一级嵌套，我怎么说的五个层次？

I have a class that contains hierarchical data. I want to present this data in my ASP.net webapp using nested repeaters. How do I do this? I've only ever done one level of nesting, how do I do say five levels?

每个项目可以有零个或多个子项。我基本上只是在每个subleveling使用一些CSS的东西缩进。我不想使用TreeView控件，我要严格按照中继棒。

Each item can have zero or many sub items. I'm basically just indenting at each subleveling using some css stuff. I do not want to use the treeview control, I want to strictly stick with a repeater.

更新：结果
我的数据来自一个数据库。我有一个项目的DataTable的一些基本属性。

Update:
My data comes from a database. I have an item datatable with some basic properties.

Item
{
   ID,
   Name,
   Description,
   ...
}

然后我有一个多对多表：

Then I have a many to many table with:

Parent
{
   ParentID,
   ChildID
}

我遍历的每个项目，并显示其子女;和它的孩子的孩子。我认为这将最好地嵌套的中继器来完成，但我可能是错的。

I'm iterating through each item and displaying its children; and its children's children. I assume this would best be accomplished with nested repeaters, but I could be wrong.

推荐答案

它总是清洁处理数据源比摆弄的ItemDataBound，但这更是这样嵌套中继器时：

It's always cleaner to deal with the datasource than messing about with ItemDataBound, but this is even more the case when nesting Repeaters:

<asp:Repeater DataSource="<%#ColOfCol%>" runat="server">
  <ItemTemplate>
    <tr>
      <asp:Repeater DataSource="<%#Container.DataItem%>" runat="server">
        <ItemTemplate>
          <td><%#SomeExtractingMethodLikeEval()%></td>
        </ItemTemplate>
      </asp:Repeater>
    </tr>
  </ItemTemplate>
</asp:Repeater>

内的数据源也可以是一个评估的财产，或返回枚举想一个方法的调用。要知道，它会与对象进行调用。我preFER写具体的版本，然后过载：

The inner datasource could also be an evaluated property, or a call to a method that returns the enumeration wanted. Just be aware that it will be called with an object. I prefer to write the specific version, and then overload:

protected IEnumerable<string> GetNames(Family fam)
{
  foreach(Person p in fam.Members)
    yield return p.FirstName + " " + p.Surname;
}
protected IEnumerable<string> GetNames(object famObj)
{
    return GetNames((Family)famObj);
}

有一点要注意的是，如果你想获得当前对象的父中继比你有获得它：

One thing to be aware of is that if you want to get the current object in the parent repeater than you have to obtain it with:

((RepeaterItem)Container.Parent.Parent).DataItem

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