转：http://blog.csdn.net/miragesky2049/article/details/7204882

SharePoint2010沙盒解决方案基础开发——关于TreeView树形控件读取列表数据（树形导航）的webpart开发及问题

1、实现效果如下：

点击各个节点进入相应的链接

2、测试列表：

3、创建解决方案及webpart，代码如下所示

using System;

using System.ComponentModel;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using Microsoft.SharePoint;

using Microsoft.SharePoint.WebControls;

//添加引用

using System.Xml.Serialization;

using System.Linq;

using System.Data;

namespace TestTreeView.TestTreeView

{

    [ToolboxData("<{0}:WPToolPaneTest runat=server></{0}:TestTreeView>"), XmlRoot(Namespace = "TestTreeView")]////定义Toolbox data

    public class TestTreeView :System.Web.UI.WebControls.WebParts.WebPart

    {

        TreeView tvList = new TreeView();

        protected override void CreateChildControls()

        {

            tvList.NodeStyle.NodeSpacing = 5;//设置相邻节点的垂直间距

            tvList.ShowExpandCollapse = false;//不显示展开节点指示符，注：详细查看问题部分

            ListBind(0, 0);

            this.Controls.Add(tvList);

        }

        protected override void RenderContents(HtmlTextWriter writer)

        {

            writer.Write("<div style=' border:2px solid #CCCCCC; width:600px'><table cellpadding='0' cellspacing='0' width='100%'><tr><td style=' width:20%; vertical-align:top'><div style=' margin-top:10px;margin-left:5px'>");

            this.tvList.RenderControl(writer);

            writer.Write("</div></td></tr></table></div>");

        }

        /// <summary>

        /// 绑定TreeViewList列表数据

        /// </summary>

        /// <param name="ParentID">上一级导航ID</param>

        /// <param name="Level">所在树形的级别</param>

        private void ListBind(int ParentID, int Level)

        {

            SPSite site = SPContext.Current.Site;

            SPWeb web = SPContext.Current.Web;

            SPList list = web.Lists["TreeViewList"];

            var query = from SPListItem item in list.Items where item["ParentID"].ToString() == ParentID.ToString() && item["Level"].ToString() == Level.ToString() select item;

            foreach (SPListItem item in query)

            {

                TreeNode parentnode = new TreeNode();

                parentnode.Text = item["标题"].ToString();

                parentnode.Value = item["ID"].ToString();

                parentnode.ImageUrl = "/_layouts/images/folder.gif";

                SPFieldUrlValue url=new SPFieldUrlValue(item["Url"].ToString());

                parentnode.NavigateUrl = url.Url;

                NodesBind(parentnode,Int32.Parse(item["ID"].ToString()),Int32.Parse(item["Level"].ToString())+1);

                tvList.Nodes.Add(parentnode);

            }

        }

        /// <summary>

        /// 递归绑定子节点内容

        /// </summary>

        /// <param name="CurrentNode">当前节点</param>

        /// <param name="ParentID">上一级导航ID</param>

        /// <param name="Level">所在树形的级别</param>

        private void NodesBind(TreeNode CurrentNode, int ParentID, int Level)

        {

            SPSite site = SPContext.Current.Site;

            SPWeb web = SPContext.Current.Web;

            SPList list = web.Lists["TreeViewList"];

            var query = from SPListItem item in list.Items where item["ParentID"].ToString() == ParentID.ToString() && item["Level"].ToString() == Level.ToString() select item;

            foreach (SPListItem item in query)

            {

                TreeNode childnode = new TreeNode();

                childnode.Text = item["标题"].ToString();

                childnode.Value = item["ID"].ToString();

                SPFieldUrlValue url = new SPFieldUrlValue(item["Url"].ToString());

                childnode.NavigateUrl = url.Url;

                childnode.ImageUrl = "/_layouts/images/folder.gif";

                NodesBind(childnode, Int32.Parse(item["ID"].ToString()), Int32.Parse(item["Level"].ToString()) + 1);//递归读取列表，绑定到子节点

                CurrentNode.ChildNodes.Add(childnode);

            }

        }

    }

}

4、问题部分

当TreeView控件tvList的ShowExpandCollapse属性（是否显示展开节点指示符）设为true时，会出现如下错误

查了一些资料，笔者未能解决此问题，只能牺牲一些TreeView控件的显示效果，如有更好的方法，请不吝赐教！！