如何在asp.net中嵌套中继器

在外部控件上，使用ItemDataBound事件，如下所示：

<asp:Repeater ID="rptDiscipline" runat="server"
     OnItemDataBound="rptDiscipline_ItemDataBound">
...

然后，在后面的代码中，处理rptDiscipline _ItemDataBound事件并手动绑定内部中继器。中继器的ItemDataBound事件为每个重复的项目激发一次。所以你会做这样的事情：

protected void rptDiscipline_ItemDataBound(Object Sender, RepeaterItemEventArgs e) 
{
    // To get your data item, cast e.Item.DataItem to 
    // whatever you're using for the data object; for example a DataRow.
    // Get the inner repeater:
    Repeater rptPrograms = (Repeater) e.Item.FindControl("rptPrograms");
    // Set the inner repeater's datasource to whatever it needs to be.
    rptPrograms.DataSource = ...
    rptPrograms.DataMember = ...
    rptPrograms.DataBind();
}

编辑：已更新以匹配您问题的更新。

您需要将外部转发器绑定到一个数据源，该数据源每个项目只有一条记录，您希望转发器进行渲染。这意味着数据源需要是一个集合/list/datatable/etc，其中只有规程。在您的情况下，我建议从datatable中为内部集合获取规程的List<string>，并将外部中继器绑定到该集合。然后，内部中继器使用ItemDataBound事件绑定到DataTable中的数据子集。要获取子集，请通过DataView筛选DataTable。

这里的代码：

protected void Page_Load(object sender, EventItems e)
{
    // get your data table
    DataTable table = ...
    if ( !IsPostBack )
    {
        // get a distinct list of disciplines
        List<string> disciplines = new List<string>();
        foreach ( DataRow row in table )
        {
            string discipline = (string) row["Discipline"];
            if ( !disciplines.Contains( discipline ) )
                disciplines.Add( discipline );
        }
        disciplines.Sort();
        // Bind the outer repeater
        rptDiscipline.DataSource = disciplines;
        rptDiscipline.DataBind();
    }
}
protected void rptDiscipline_ItemDataBound(Object Sender, RepeaterItemEventArgs e) 
{
    // To get your data item, cast e.Item.DataItem to 
    // whatever you're using for the data object
    string discipline = (string) e.Item.DataItem;
    // Get the inner repeater:
    Repeater rptPrograms = (Repeater) e.Item.FindControl("rptPrograms");
    // Create a filtered view of the data that shows only 
    // the disciplines needed for this row
    // table is the datatable that was originally bound to the outer repeater
    DataView dv = new DataView( table );  
    dv.RowFilter = String.Format("Discipline = '{0}'", discipline);
    // Set the inner repeater's datasource to whatever it needs to be.
    rptPrograms.DataSource = dv;
    rptPrograms.DataBind();
}   

如果您不想在ItemDataBound事件上执行此操作，也可以通过绑定到父项的子属性在页面中内联执行，如果子属性是这样的集合：

<asp:Repeater runat="server" ID="OuterRepeater" >
    <ItemTemplate>
        Outer Content: <%# DataBinder.Eval(Container.DataItem, "ParentProperty")%>
        <asp:Repeater runat="server" ID="InnerRepeater" DataSource='<%# DataBinder.Eval(Container.DataItem, "ChildCollection")%>' >
            <ItemTemplate>
                <%# DataBinder.Eval(Container.DataItem, "ChildProperty")%>
            </ItemTemplate>
        </asp:Repeater>
    </ItemTemplate>
</asp:Repeater>

首先需要两个列表，一个是规程列表，然后是所有数据的列表。

数据将规程列表绑定到外部中继器。如果有6个学科，中继器应重复6次。

    <asp:Repeater ID="rptDiscipline" runat="server" OnItemDataBound="rptDiscipline_ItemDataBound">
        <ItemTemplate>
            <h4><%# Eval("Discipline")%></h4>
            <ul>
                <asp:Repeater runat="server" ID="InnerRepeater" >
                    <ItemTemplate>
                        <li>
                            <asp:Label runat="server" ID="lbl" />
                        </li>
                    </ItemTemplate>
                </asp:Repeater>
            </ul>
        </ItemTemplate>
    </asp:Repeater>
protected void rptDiscipline_ItemDataBound(Object Sender, RepeaterItemEventArgs e) 
{    
    Repeater inner= (Repeater) e.Item.FindControl("InnerRepeater");
    //You want to bind all the data related to this discipline
    DataRowView drView = (DataRowView) e.Item.DataItem;
    string discipline= drView["Discipline"] as string;
    //filter your total data with ones that match the discipline
    inner.DataSource = //data bind the filtered list here
    inner.DataBind();
}