How to check if a control is child of another control? "Control.IsChildOf"

Question

I have 3 panels:

<asp:Panel ID="ParentPanel" runat="server">
    <asp:Panel ID="AnnoyingPanel" runat="server">
        <asp:Panel ID="P" runat="server">
        </asp:Panel>
    </asp:Panel>
</asp:Panel>

How can I check if P is child of ParentPanel? Is there some LINQish way to do it?

Is there some more optimized way than the one I provided? Maybe using Linq?

Answer 1

I end up making a recursive extension method

public static bool IsChildOf(this Control c, Control parent)
{
    return ((c.Parent != null && c.Parent == parent) || (c.Parent != null ? c.Parent.IsChildOf(parent) : false));
}

Resulting in

P.IsChildOf(ParentPanel); // true
ParentPanel.IsChildOf(P); // false

Answer 2

You can do that search recursive:

Panel topParent = GetTopParent(P);

---

private Panel GetTopParent(Panel child)
{
    if (child.Parent.GetType() == typeof(Panel))
        return GetTopParent((Panel)child.Parent);
    else return child;
}