温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[1] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[2] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[3] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[4] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[2] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[3] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
[4] 温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
系列文章导航：
温故知新ASP.NET 2.0(C#)(1) - MasterPage(母版页)
温故知新ASP.NET 2.0(C#)(1) - MasterPage(母版页)
温故知新ASP.NET 2.0(C#)(2) - Themes(主题)
温故知新ASP.NET 2.0(C#)(3) - SiteMap(站点地图)
温故知新ASP.NET 2.0(C#)(4) - 缓存&SqlCacheDependency
温故知新ASP.NET 2.0(C#)(5) - Localization
温故知新ASP.NET 2.0(C#)(8) - DataSourceControl
温故知新ASP.NET 2.0(C#)(6) - Membership&RoleManager
温故知新ASP.NET 2.0(C#)(7) - Profile
温故知新ASP.NET 2.0(C#)(8) - DataSourceControl
自定义站点地图提供程序（SqlServer方式）
SqlSiteMapProvider.cs（“sp_GetSiteMap”为读取站点地图数据的存储过程，详见源码）
using System;using System.Web;using System.Data.SqlClient;using System.Collections.Specialized;using System.Configuration;using System.Web.Configuration;using System.Collections.Generic;using System.Configuration.Provider;using System.Security.Permissions;using System.Data.Common;using System.Data;
/**//// <summary>
/// SqlSiteMapProvider
/// </summary>public class SqlSiteMapProvider : StaticSiteMapProvider
{ private string _strCon; private int _indexID, _indexTitle, _indexUrl, _indexDesc, _indexParent; // 节点 private SiteMapNode _node; // 节点字典表 private Dictionary<int, SiteMapNode> _nodes = new Dictionary<int, SiteMapNode>(); // 用于单例模式 private readonly object _lock = new object();
/**//// <summary> /// 初始化 /// </summary> /// <param name="name">name</param>
/// <param name="config">config</param> public override void Initialize(string name, NameValueCollection config) { // 验证是否有config if (config == null) throw new ArgumentNullException("config不能是null"); // 没有provider则设置为默认的 if (String.IsNullOrEmpty(name)) name = "SqlSiteMapProvider"; // 没有描述就增加一个描述 if (string.IsNullOrEmpty(config["description"])) { config.Remove("description"); config.Add("description", "SqlSiteMapProvider"); } // 调用基类的初始化方法 base.Initialize(name, config); // 初始化连接字符串 string conStringName = config["connectionStringName"]; if (String.IsNullOrEmpty(conStringName)) throw new ProviderException("没找到connectionStringName"); config.Remove("connectionStringName"); if (WebConfigurationManager.ConnectionStrings[conStringName] == null) throw new ProviderException("根据connectionStringName没找到连接字符串"); // 获得连接字符串 _strCon = WebConfigurationManager.ConnectionStrings[conStringName].ConnectionString; if (String.IsNullOrEmpty(_strCon)) throw new ProviderException("连接字符串是空的"); } /**//// <summary> /// 从持久性存储区加载站点地图信息，并在内存中构建它 /// </summary> /// <returns></returns> public override SiteMapNode BuildSiteMap() { lock (_lock) { // 单例模式的实现 if (_node != null) return _node; SqlConnection connection = new SqlConnection(_strCon); try { SqlCommand command = new SqlCommand("sp_GetSiteMap", connection); command.CommandType = CommandType.StoredProcedure; connection.Open(); SqlDataReader reader = command.ExecuteReader(); // 获得各个字段的索引 _indexID = reader.GetOrdinal("ID"); _indexUrl = reader.GetOrdinal("Url"); _indexTitle = reader.GetOrdinal("Title"); _indexDesc = reader.GetOrdinal("Description"); _indexParent = reader.GetOrdinal("Parent"); if (reader.Read()) { // 把第一条记录作为根节点添加 _node = CreateSiteMapNodeFromDataReader(reader); AddNode(_node, null); // 构造节点树 while (reader.Read()) { // 在站点地图中增加一个节点 SiteMapNode node = CreateSiteMapNodeFromDataReader(reader); AddNode(node, GetParentNodeFromDataReader(reader)); } } reader.Close(); } catch (Exception ex) { throw new Exception(ex.ToString()); } finally { connection.Close(); } // 返回SiteMapNode return _node; } } /**//// <summary> /// 将检索目前由当前提供程序管理的所有节点的根节点 /// </summary> /// <returns></returns> protected override SiteMapNode GetRootNodeCore() { lock (_lock) { return BuildSiteMap(); } } /**//// <summary> /// 根据DataReader读出来的数据返回SiteMapNode /// </summary> /// <param name="reader">DbDataReader</param> /// <returns></returns> private SiteMapNode CreateSiteMapNodeFromDataReader(DbDataReader reader) { if (reader.IsDBNull(_indexID)) throw new ProviderException("没找到ID"); int id = reader.GetInt32(_indexID); if (_nodes.ContainsKey(id)) throw new ProviderException("不能有重复ID"); // 根据字段索引获得相应字段的值 string title = reader.IsDBNull(_indexTitle) ? null : reader.GetString(_indexTitle).Trim(); string url = reader.IsDBNull(_indexUrl) ? null : reader.GetString(_indexUrl).Trim(); string description = reader.IsDBNull(_indexDesc) ? null : reader.GetString(_indexDesc).Trim(); // 新建一个SiteMapNode SiteMapNode node = new SiteMapNode(this, id.ToString(), url, title, description); // 把这个SiteMapNode添加进节点字典表里 _nodes.Add(id, node); // 返回这个SiteMapNode return node; } 