Build Tree View Structure for SharePoint List Data

博客地址 http://blog.csdn.net/foxdave

此文参考自->原文链接

版权归原作者所有，我只是进行一下大致的翻译

应坛友要求，帮助验证一下功能。

SharePoint列表数据的树视图结构

1. 创建一个自定义列表，名字就还叫“CategoryDetails”这个吧，我喜欢用规范的英语。

2. 创建两个字段“Category Name”和“Parent Category”，在这里实际上就是ID和ParentID的概念，一个树，自然要有这种层级结构。

第一个字段为文本类型，类似PK的概念，必填且唯一

第二个字段为查阅项，自连接，如上所述。

字段创建完之后我们做一些测试的数据。

4. 部署WebPart解决方案，稍后附上树控件后台代码，原网站上有下载链接，直接下载下来，指定Site URL，修改后部署即可。

在页面上添加该WebPart，显示树状视图

坛友说的不好用实际上是因为字段的名称导致的，在创建字段的时候有空格，那么在用Query查询的时候，需要把空格替换为_x0020_。

后台代码如下

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using System.Text;
using System.Collections.Generic;
using System.Web;

namespace TreeView.TreeStructure
{
    public partial class TreeStructureUserControl : UserControl
    {
        public const string DYNAMIC_CAML_QUERY = "<Where><IsNull><FieldRef Name='{0}' /></IsNull></Where>";
        public const string DYNAMIC_CAML_QUERY_GET_CHILD_NODE = "<Where><Eq><FieldRef Name='{0}' /><Value Type='LookupMulti'>{1}</Value></Eq></Where>";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {

                BuildTree();

            }
        }
        protected void BuildTree()
        {
            SPList TasksList;
            SPQuery objSPQuery;
            StringBuilder Query = new StringBuilder();
            SPListItemCollection objItems;
            string DisplayColumn = string.Empty;
            string Title = string.Empty;
            string[] valueArray = null;
            treeViewCategories.Nodes.Clear();
            try
            {
                using (SPSite site = new SPSite(SPContext.Current.Web.Url))
                {
                    using (SPWeb web = site.OpenWeb())
                    {

                        TasksList = SPContext.Current.Web.Lists["CategoryDetails"];
                        if (TasksList != null)
                        {

                            objSPQuery = new SPQuery();
                            Query.Append(String.Format(DYNAMIC_CAML_QUERY, "Parent_x0020_Category"));
                            objSPQuery.Query = Query.ToString();
                            objItems = TasksList.GetItems(objSPQuery);
                            if (objItems != null && objItems.Count > 0)
                            {
                                foreach (SPListItem objItem in objItems)
                                {
                                    DisplayColumn = Convert.ToString(objItem["Category_x0020_Name"]);
                                    Title = Convert.ToString(objItem["Category_x0020_Name"]);
                                    CreateTree(Title, valueArray, null, DisplayColumn, objItem["ID"].ToString());
                                }
                            }

                        }
                    }
                }

            }
            catch (Exception ex)
            {
                throw ex;
            }

        }
        private void CreateTree(string RootNode, string[] valueArray, List<SPListItem> objNodeCollection, string DisplayValue, string KeyValue)
        {

            string objExpandValue = string.Empty;
            TreeNode objTreeNode;
            TreeNodeCollection objChildNodeColn;
            try
            {

                objTreeNode = new TreeNode(DisplayValue, KeyValue);
                treeViewCategories.Nodes.Add(objTreeNode);
                objTreeNode.CollapseAll();
                objChildNodeColn = GetChildNode(RootNode, valueArray, objNodeCollection);
                foreach (TreeNode childnode in objChildNodeColn)
                {
                    objTreeNode.ChildNodes.Add(childnode);

                }

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        private TreeNodeCollection GetChildNode(string RootNode, string[] valueArray, List<SPListItem> objListItemColn)
        {
            TreeNodeCollection childtreenodes = new TreeNodeCollection();
            SPQuery objSPQuery;
            SPListItemCollection objItems = null;
            List<SPListItem> objNodeListItems = new List<SPListItem>();
            SiteMapNodeCollection objNode = new SiteMapNodeCollection();
            objSPQuery = new SPQuery();
            string objNodeTitle = string.Empty;
            string objLookupColumn = string.Empty;
            StringBuilder Query = new StringBuilder();
            SPList objTaskList;
            SPField spField;
            string objKeyColumn;

            try
            {

                objTaskList = SPContext.Current.Web.Lists["CategoryDetails"];
                objLookupColumn = "Parent_x0020_Category";//objTreeViewControlField.ParentLookup;

                spField = SPContext.Current.Web.Lists["CategoryDetails"].Fields["Parent Category"];

                Query.Append(String.Format(DYNAMIC_CAML_QUERY_GET_CHILD_NODE, spField.InternalName, RootNode));
                objSPQuery.Query = Query.ToString();

                objItems = objTaskList.GetItems(objSPQuery);
                foreach (SPListItem objItem in objItems)
                {
                    objNodeListItems.Add(objItem);
                }

                if (objNodeListItems != null && objNodeListItems.Count > 0)
                {
                    foreach (SPListItem objItem in objNodeListItems)
                    {
                        RootNode = Convert.ToString(objItem["Category_x0020_Name"]);
                        objKeyColumn = Convert.ToString(objItem["ID"]);

                        objNodeTitle = Convert.ToString(objItem["Category_x0020_Name"]);
                        if (!String.IsNullOrEmpty(objNodeTitle))
                        {
                            TreeNode childNode = new TreeNode();
                            childNode.Text = objNodeTitle;
                            childNode.Value = objKeyColumn;
                            childNode.CollapseAll();
                            foreach (TreeNode cnode in GetChildNode(RootNode, valueArray, objListItemColn))
                            {
                                childNode.ChildNodes.Add(cnode);

                            }
                            childtreenodes.Add(childNode);
                        }
                    }
                }

            }
            catch (Exception ex)
            {

                throw ex;
            }
            return childtreenodes;
            // Call method again (recursion) to get the child items
        }

    }
}

That's all, thanks.