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

SharePoint2010沙盒解決方案基礎開發——關于TreeView樹形控件讀取列表數據（樹形導航）的webpart開發及問題

1、實現效果如下：

點擊各個節點進入相應的鏈接

2、測試列表：

3、創建解決方案及webpart，代碼如下所示

[html] view plaincopyprint?

1. using?System;??
2. using?System.ComponentModel;??
3. using?System.Web;??
4. using?System.Web.UI;??
5. using?System.Web.UI.WebControls;??
6. using?System.Web.UI.WebControls.WebParts;??
7. using?Microsoft.SharePoint;??
8. using?Microsoft.SharePoint.WebControls;??
9. //添加引用??
10. using?System.Xml.Serialization;??
11. using?System.Linq;??
12. using?System.Data;??
13. ??
14. namespace?TestTreeView.TestTreeView??
15. {??
16. ????[ToolboxData("<{0}:WPToolPaneTest?runat=server></{0}:TestTreeView>"),?XmlRoot(Namespace?=?"TestTreeView")]定義Toolbox?data????
17. ????public?class?TestTreeView?:System.Web.UI.WebControls.WebParts.WebPart??
18. ????{??
19. ????????TreeView?tvList?=?new?TreeView();??
20. ??
21. ????????protected?override?void?CreateChildControls()??
22. ????????{??
23. ????????????tvList.NodeStyle.NodeSpacing?=?5;//設置相鄰節點的垂直間距??
24. ????????????tvList.ShowExpandCollapse?=?false;//不顯示展開節點指示符，注：詳細查看問題部分??
25. ????????????ListBind(0,?0);??
26. ????????????this.Controls.Add(tvList);??
27. ????????}??
28. ??
29. ????????protected?override?void?RenderContents(HtmlTextWriter?writer)??
30. ????????{??
31. ????????????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'>");??
32. ????????????this.tvList.RenderControl(writer);??
33. ????????????writer.Write("</div></td></tr></table></div>");??
34. ????????}??
35. ??
36. ????????///?<summary>??
37. ????????///?綁定TreeViewList列表數據??
38. ????????///?</summary>??
39. ????????///?<param?name="ParentID">上一級導航ID</param>??
40. ????????///?<param?name="Level">所在樹形的級別</param>??
41. ????????private?void?ListBind(int?ParentID,?int?Level)??
42. ????????{??
43. ????????????SPSite?site?=?SPContext.Current.Site;??
44. ????????????SPWeb?web?=?SPContext.Current.Web;??
45. ????????????SPList?list?=?web.Lists["TreeViewList"];??
46. ????????????var?query?=?from?SPListItem?item?in?list.Items?where?item["ParentID"].ToString()?==?ParentID.ToString()?&&?item["Level"].ToString()?==?Level.ToString()?select?item;??
47. ????????????foreach?(SPListItem?item?in?query)??
48. ????????????{??
49. ????????????????TreeNode?parentnode?=?new?TreeNode();??
50. ????????????????parentnode.Text?=?item["標題"].ToString();??
51. ????????????????parentnode.Value?=?item["ID"].ToString();??
52. ????????????????parentnode.ImageUrl?=?"/_layouts/images/folder.gif";??
53. ????????????????SPFieldUrlValue?url=new?SPFieldUrlValue(item["Url"].ToString());??
54. ????????????????parentnode.NavigateUrl?=?url.Url;??
55. ????????????????NodesBind(parentnode,Int32.Parse(item["ID"].ToString()),Int32.Parse(item["Level"].ToString())+1);??
56. ????????????????tvList.Nodes.Add(parentnode);??
57. ????????????}??
58. ????????}??
59. ??
60. ????????///?<summary>??
61. ????????///?遞歸綁定子節點內容??
62. ????????///?</summary>??
63. ????????///?<param?name="CurrentNode">當前節點</param>??
64. ????????///?<param?name="ParentID">上一級導航ID</param>??
65. ????????///?<param?name="Level">所在樹形的級別</param>??
66. ????????private?void?NodesBind(TreeNode?CurrentNode,?int?ParentID,?int?Level)??
67. ????????{??
68. ????????????SPSite?site?=?SPContext.Current.Site;??
69. ????????????SPWeb?web?=?SPContext.Current.Web;??
70. ????????????SPList?list?=?web.Lists["TreeViewList"];??
71. ????????????var?query?=?from?SPListItem?item?in?list.Items?where?item["ParentID"].ToString()?==?ParentID.ToString()?&&?item["Level"].ToString()?==?Level.ToString()?select?item;??
72. ????????????foreach?(SPListItem?item?in?query)??
73. ????????????{??
74. ????????????????TreeNode?childnode?=?new?TreeNode();??
75. ????????????????childnode.Text?=?item["標題"].ToString();??
76. ????????????????childnode.Value?=?item["ID"].ToString();??
77. ????????????????SPFieldUrlValue?url?=?new?SPFieldUrlValue(item["Url"].ToString());??
78. ????????????????childnode.NavigateUrl?=?url.Url;??
79. ????????????????childnode.ImageUrl?=?"/_layouts/images/folder.gif";??
80. ????????????????NodesBind(childnode,?Int32.Parse(item["ID"].ToString()),?Int32.Parse(item["Level"].ToString())?+?1);//遞歸讀取列表，綁定到子節點??
81. ????????????????CurrentNode.ChildNodes.Add(childnode);??
82. ??????????????????
83. ????????????}??
84. ????????}??
85. ??
86. ????}??
87. }??

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")]定義Toolbox data  public class TestTreeView :System.Web.UI.WebControls.WebParts.WebPart{TreeView tvList = new TreeView();protected override void CreateChildControls(){tvList.NodeStyle.NodeSpacing = 5;//設置相鄰節點的垂直間距tvList.ShowExpandCollapse = false;//不顯示展開節點指示符，注：詳細查看問題部分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>/// 綁定TreeViewList列表數據/// </summary>/// <param name="ParentID">上一級導航ID</param>/// <param name="Level">所在樹形的級別</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["標題"].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>/// 遞歸綁定子節點內容/// </summary>/// <param name="CurrentNode">當前節點</param>/// <param name="ParentID">上一級導航ID</param>/// <param name="Level">所在樹形的級別</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["標題"].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);//遞歸讀取列表，綁定到子節點CurrentNode.ChildNodes.Add(childnode);}}}
}

?

4、問題部分

當TreeView控件tvList的ShowExpandCollapse屬性（是否顯示展開節點指示符）設為true時，會出現如下錯誤

查了一些資料，筆者未能解決此問題，只能犧牲一些TreeView控件的顯示效果，如有更好的方法，請不吝賜教！！

?

轉載于:https://www.cnblogs.com/jackljf/p/3589213.html

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