服务器控件在render时，怎么样将子节点的内容以类似xml格式直接取出

自己编写服务器控件，需要在中间写一些自定义的XML格式的子节点

例如: <asp:userControl>
        <a>
            <b attr1="attr1" attr2="attr2">
                <c attr1="attr1" attr2="attr2">ccccc</c>
            </b>
        </a>
     </asp:userControl>

其中子节点的层数和内容可以任意，希望在render的时候，可以将中间的<a>......</a>取出来。 --------------------编程问答-------------------- protected override void Render(HtmlTextWriter writer)
        {
            //base.Render(writer);
            //
            System.IO.StringWriter sw = new System.IO.StringWriter();
            HtmlTextWriter htmlWriter = new HtmlTextWriter(sw);
            base.Render(htmlWriter);
            string html = sw.ToString(); // HERE !!!
            // Response.Write(html); // 测试输出
        } --------------------编程问答-------------------- 参考一下这段代码:

Imports Microsoft.VisualBasic
Imports System.Web.UI.WebControls

Namespace MyControls

    <ParseChildren(False)> _
    Public Class MyControl2
        Inherits WebControl

        Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)

            Dim litChild As LiteralControl = CType(obj, LiteralControl)

            litChild.Text = HttpContext.Current.Server.HtmlEncode(litChild.Text)
            MyBase.AddParsedSubObject(litChild)

        End Sub
    End Class

End Namespace --------------------编程问答-------------------- PersistenceMode(PersistenceMode.InnerProperty),DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]

参考

http://www.aspxboy.com/code/default.aspx/S7s2zPJbeI9PJA/OKHpAVwVaUEhf02EgEOgeB3Yd5Z7fLL3ZNgdv7XIqertUOYm9swwXqZ4525aiPgV7zXEob8bofuU3o3aaupA3VCA9GE3c6fW3I5gsbG4Lk3V4bYgBrzsbLvmavWKRR2Zb2QhJIA==.Aspx

补充：.NET技术 ,  ASP.NET