Repeater in Repeater

I have a repeater inside a repeater. Where the parent repeater is bound 开发者_如何转开发to a Datatble which has a column with a Datatable in it.

I would like to bind the child repeater to the datatable column in the parent repeater's datarow

Is this possible? i was thinking i could do this directly in the aspx file like:

DataSource="<%# DataBinder.Eval(Container.DataItem, "Products")%>" but it doesn't seem to work.

In the parent repeater, attach a method to the OnItemDataBound event and in the method, find the nested repeater and data bind it.

Example (.aspx):

<asp:Repeater ID="ParentRepeater" runat="server" OnItemDataBound="ItemBound">
    <ItemTemplate>
        <!-- Repeated data -->
        <asp:Repeater ID="ChildRepeater" runat="server">
            <ItemTemplate>
                <!-- Nested repeated data -->
            </ItemTemplate>
        </asp:Repeater>
    </ItemTemplate>
</asp:Repeater>

Example (.cs):

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ParentRepeater.DataSource = ...;
        ParentRepeater.DataBind();
    }
}

protected void ItemBound(object sender, RepeaterItemEventArgs args)
{
    if (args.Item.ItemType == ListItemType.Item || args.Item.ItemType == ListItemType.AlternatingItem)
    {
        Repeater childRepeater = (Repeater)args.Item.FindControl("ChildRepeater");
        childRepeater.DataSource = ...;
        childRepeater.DataBind();
    }
}

I would add a DataBinding event to the child repeater itself:

<asp:Repeater ID="parentRepeater" runat="server">
    <asp:Repeater ID="childRepeater" runat="server"
        OnDataBinding="childRepeater_DataBinding" />
</asp:Repeater>

Then just implement it:

protected void childRepeater_DataBinding(object sender, System.EventArgs e)
{
    Repeater rep = (Repeater)(sender);

    int someIdFromParentDataSource = (int)(Eval("ParentID"));

    // Assuming you have a function call `GetSomeData` that will return
    // the data you want to bind to your child repeater.
    rep.DataSource = GetSomeData(int);
    rep.DataBind();
}

I prefer to do it at the control level instead of the ItemDataBound level so that if you ever have to remove controls or items within your templates you don't have to worry about looking for code in the parent controls that use it. It get's all localize witht he control itself. Plus you never have to do a FindControl.

If you want to replace a control in the future you can just delete it and your code will still work since it is all self contained. Using the ItemDataBound would cause your code to still compile but crash or act unexpectedly at runtime because of it's reliance on child controls.

Here is how it's done:

DataSource='<%# ((System.Data.DataRowView)Container.DataItem)[3] %>'

So if you know the column in the parent table that holds the child table/datasource for the nested repeater you can put this directly in the aspx file.

If I need to do that, I usually do it using the ItemDataBound event of the parent repeater to bind the child repeater. If e is your EventArgs parameter, you'll have access to the child repeater via e.Item.FindControl(), and access to the data via e.Item.DataItem.

Repeater1 OnItemDataBound event, then FindControl Repeater2. The code-behind will not find the nested Repeater2! You have to use FindControl("Repeater2").

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.DataItem != null)
    {
        MemberView dataRow = (MemberView)e.Item.DataItem;
        var cat = MemberPresenter.getMemberID(dataRow.memID);

        Repeater rp2 = (Repeater)e.Item.FindControl("Repeater2");
        rp2.DataSource = cat;
        rp2.DataBind();
    }  
}

Here is an example of how to do this: Article for nested repeater control

 protected void MainRepeater_ItemDataBound(object sender, RepeaterItemEventArgs args)
    {
         if (args.Item.ItemType == ListItemType.Item || args.Item.ItemType == ListItemType.AlternatingItem)
            {
                Repeater childRepeater = (Repeater)args.Item.FindControl("ChildRepeater");

                DataTable innerTable= ((DataRowView)args.Item.DataItem)["InnerTableColumnName"] as DataTable;
                childRepeater.DataSource = tasksDetails;
                childRepeater.DataBind();
            }
    }