SiteMap.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / SiteMap.cs / 2 / SiteMap.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Copyright (c) 2002 Microsoft Corporation 
 */
 
namespace System.Web {

    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Configuration.Provider; 
    using System.Security.Permissions; 
    using System.Web.Configuration;
    using System.Web.UI; 
    using System.Web.Hosting;


    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public static class SiteMap {
 
        internal const string SectionName = "system.web/siteMap"; 

        private static SiteMapProviderCollection _providers; 
        private static SiteMapProvider _provider;
        private static object _lockObject = new object();

        private static bool _configEnabledEvaluated; 
        private static bool _enabled;
 
 
        public static SiteMapNode CurrentNode {
            get { 
                return Provider.CurrentNode;
            }
        }
 
        public static bool Enabled {
            get { 
                if (!_configEnabledEvaluated) { 
                    SiteMapSection config = RuntimeConfig.GetAppConfig().SiteMap;
                    _enabled = (config != null && config.Enabled); 

                    _configEnabledEvaluated = true;
                }
 
                return _enabled;
            } 
        } 

 
        public static SiteMapProvider Provider {
            get {
                Initialize();
                return _provider; 
            }
        } 
 

        public static SiteMapProviderCollection Providers { 
            get {
                Initialize();
                return _providers;
            } 
        }
 
 
        public static SiteMapNode RootNode {
            get { 
                SiteMapProvider rootProvider = Provider.RootProvider;
                SiteMapNode rootNode = rootProvider.RootNode;

                if (rootNode == null) { 
                    String name = ((ProviderBase)rootProvider).Name;
                    throw new InvalidOperationException(SR.GetString(SR.SiteMapProvider_Invalid_RootNode, name)); 
                } 

                return rootNode; 

            }
        }
 

        public static event SiteMapResolveEventHandler SiteMapResolve { 
            add { 
                Provider.SiteMapResolve += value;
            } 
            remove {
                Provider.SiteMapResolve -= value;
            }
        } 

        private static void Initialize() { 
            if (_providers != null) 
                return;
 
            HttpRuntime.CheckAspNetHostingPermission(AspNetHostingPermissionLevel.Low, SR.Feature_not_supported_at_this_level);

            lock (_lockObject) {
                if (_providers != null) 
                    return;
 
                SiteMapSection config = RuntimeConfig.GetAppConfig().SiteMap; 
                if (config == null) {
                    // just return an empty collection so that designer will work. 
                    _providers = new SiteMapProviderCollection();
                    return;
                }
 
                if (!config.Enabled)
                    throw new InvalidOperationException(SR.GetString(SR.SiteMap_feature_disabled, SiteMap.SectionName)); 
 
                // Make sure the default provider exists.
                config.ValidateDefaultProvider(); 

                _providers = config.ProvidersInternal;
                _provider = _providers[config.DefaultProvider];
                _providers.SetReadOnly(); 
            }
        } 
    } 

 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class SiteMapProviderCollection :  ProviderCollection {

        public override void Add(ProviderBase provider) { 
            if (provider == null)
                throw new ArgumentNullException("provider"); 
 
            if (!(provider is SiteMapProvider))
                throw new ArgumentException(SR.GetString( 
                SR.Provider_must_implement_the_interface, provider.GetType().Name, typeof(SiteMapProvider).Name), "provider");

            Add((SiteMapProvider)provider);
        } 

 
        public void Add(SiteMapProvider provider) { 
            if (provider == null) {
                throw new ArgumentNullException("provider"); 
            }

            base.Add(provider);
        } 

 
        public void AddArray(SiteMapProvider [] providerArray) { 
            if (providerArray == null) {
                throw new ArgumentNullException("providerArray"); 
            }

            foreach (SiteMapProvider provider in providerArray) {
                if (this[provider.Name] != null) 
                    throw new ArgumentException(SR.GetString(SR.SiteMapProvider_Multiple_Providers_With_Identical_Name, provider.Name));
 
                Add(provider); 
            }
        } 


        public new SiteMapProvider this[string name] {
            get { 
                return (SiteMapProvider) base[name];
            } 
        } 
    }
 

    public delegate SiteMapNode SiteMapResolveEventHandler(Object sender, SiteMapResolveEventArgs e);

 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class SiteMapResolveEventArgs : EventArgs { 
        private HttpContext _context;
        private SiteMapProvider _provider; 

        public SiteMapResolveEventArgs(HttpContext context, SiteMapProvider provider) {
            _context = context;
            _provider = provider; 
        }
 
        public SiteMapProvider Provider { 
            get {
                return _provider; 
            }
        }

        public HttpContext Context { 
            get {
                return _context; 
            } 
        }
    } 
}

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