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
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!!
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