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
}
}
}
