mcs/class/System.Web/System.Web.Configuration_2.0/WebConfigurationManager.cs

   1 //
   2 // System.Web.Configuration.WebConfigurationManager.cs
   3 //
   4 // Authors:
   5 //      Lluis Sanchez Gual (lluis@novell.com)
   6 //      Chris Toshok (toshok@ximian.com)
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining
   9 // a copy of this software and associated documentation files (the
  10 // "Software"), to deal in the Software without restriction, including
  11 // without limitation the rights to use, copy, modify, merge, publish,
  12 // distribute, sublicense, and/or sell copies of the Software, and to
  13 // permit persons to whom the Software is furnished to do so, subject to
  14 // the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be
  17 // included in all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26 //
  27 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  28 //
  29
  30 #if NET_2_0
  31
  32 using System;
  33 using System.IO;
  34 using System.Collections;
  35 using System.Collections.Specialized;
  36 using System.Reflection;
  37 #if MONOWEB_DEP
  38 using Mono.Web.Util;
  39 #endif
  40 using System.Xml;
  41 using System.Configuration;
  42 using System.Configuration.Internal;
  43 using _Configuration = System.Configuration.Configuration;
  44 using System.Web.Util;
  45
  46 namespace System.Web.Configuration {
  47
  48         public static class WebConfigurationManager
  49         {
  50 #if !TARGET_J2EE
  51                 static IInternalConfigConfigurationFactory configFactory;
  52                 static Hashtable configurations = Hashtable.Synchronized (new Hashtable ());
  53                 static Hashtable sectionCache = new Hashtable ();
  54                 static Hashtable configPaths = Hashtable.Synchronized (new Hashtable ());
  55 #else
  56                 const string AppSettingsKey = "WebConfigurationManager.AppSettings";
  57                 static internal IInternalConfigConfigurationFactory configFactory
  58                 {
  59                         get{
  60                                 IInternalConfigConfigurationFactory factory = (IInternalConfigConfigurationFactory)AppDomain.CurrentDomain.GetData("WebConfigurationManager.configFactory");
  61                                 if (factory == null){
  62                                         lock (AppDomain.CurrentDomain){
  63                                                 object initialized = AppDomain.CurrentDomain.GetData("WebConfigurationManager.configFactory.initialized");
  64                                                 if (initialized == null){
  65                                                         PropertyInfo prop = typeof(ConfigurationManager).GetProperty("ConfigurationFactory", BindingFlags.Static | BindingFlags.NonPublic);
  66                                                         if (prop != null){
  67                                                                 factory = prop.GetValue(null, null) as IInternalConfigConfigurationFactory;
  68                                                                 configFactory = factory;
  69                                                         }
  70                                                 }
  71                                         }
  72                                 }
  73                                 return factory != null ? factory : configFactory;
  74                         }
  75                         set{
  76                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.configFactory", value);
  77                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.configFactory.initialized", true);
  78                         }
  79                 }
  80
  81                 static internal Hashtable configurations
  82                 {
  83                         get{
  84                                 Hashtable table = (Hashtable)AppDomain.CurrentDomain.GetData("WebConfigurationManager.configurations");
  85                                 if (table == null){
  86                                         lock (AppDomain.CurrentDomain){
  87                                                 object initialized = AppDomain.CurrentDomain.GetData("WebConfigurationManager.configurations.initialized");
  88                                                 if (initialized == null){
  89                                                         table = Hashtable.Synchronized (new Hashtable (StringComparer.OrdinalIgnoreCase));
  90                                                         configurations = table;
  91                                                 }
  92                                         }
  93                                 }
  94                                 return table != null ? table : configurations;
  95
  96                         }
  97                         set{
  98                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.configurations", value);
  99                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.configurations.initialized", true);
 100                         }
 101                 }
 102
 103                 static Hashtable sectionCache
 104                 {
 105                         get
 106                         {
 107                                 Hashtable sectionCache = (Hashtable) AppDomain.CurrentDomain.GetData ("sectionCache");
 108                                 if (sectionCache == null) {
 109                                         sectionCache = new Hashtable (StringComparer.OrdinalIgnoreCase);
 110                                         AppDomain.CurrentDomain.SetData ("sectionCache", sectionCache);
 111                                 }
 112                                 return sectionCache;
 113                         }
 114                         set
 115                         {
 116                                 AppDomain.CurrentDomain.SetData ("sectionCache", value);
 117                         }
 118                 }
 119
 120                 static internal Hashtable configPaths
 121                 {
 122                         get{
 123                                 Hashtable table = (Hashtable)AppDomain.CurrentDomain.GetData("WebConfigurationManager.configPaths");
 124                                 if (table == null){
 125                                         lock (AppDomain.CurrentDomain){
 126                                                 object initialized = AppDomain.CurrentDomain.GetData("WebConfigurationManager.configPaths.initialized");
 127                                                 if (initialized == null){
 128                                                         table = Hashtable.Synchronized (new Hashtable (StringComparer.OrdinalIgnoreCase));
 129                                                         configPaths = table;
 130                                                 }
 131                                         }
 132                                 }
 133                                 return table != null ? table : configPaths;
 134
 135                         }
 136                         set{
 137                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.configPaths", value);
 138                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.configPaths.initialized", true);
 139                         }
 140                 }
 141 #endif
 142
 143                 static ArrayList extra_assemblies = null;
 144                 static internal ArrayList ExtraAssemblies {
 145                         get {
 146                                 if (extra_assemblies == null)
 147                                         extra_assemblies = new ArrayList();
 148                                 return extra_assemblies;
 149                         }
 150                 }
 151
 152                 static bool hasConfigErrors = false;
 153                 static object hasConfigErrorsLock = new object ();
 154                 static internal bool HasConfigErrors {
 155                         get {
 156                                 lock (hasConfigErrorsLock) {
 157                                         return hasConfigErrors;
 158                                 }
 159                         }
 160                 }
 161
 162                 static WebConfigurationManager ()
 163                 {
 164                         PropertyInfo prop = typeof(ConfigurationManager).GetProperty ("ConfigurationFactory", BindingFlags.Static | BindingFlags.NonPublic);
 165                         if (prop != null)
 166                                 configFactory = prop.GetValue (null, null) as IInternalConfigConfigurationFactory;
 167
 168                         // Part of fix for bug #491531
 169                         Type type = Type.GetType ("System.Configuration.CustomizableFileSettingsProvider, System", false);
 170                         if (type != null) {
 171                                 FieldInfo fi = type.GetField ("webConfigurationFileMapType", BindingFlags.Static | BindingFlags.NonPublic);
 172                                 if (fi != null && fi.FieldType == Type.GetType ("System.Type"))
 173                                         fi.SetValue (null, typeof (ApplicationSettingsConfigurationFileMap));
 174                         }
 175                 }
 176
 177                 public static _Configuration OpenMachineConfiguration ()
 178                 {
 179                         return ConfigurationManager.OpenMachineConfiguration ();
 180                 }
 181
 182                 [MonoLimitation ("locationSubPath is not handled")]
 183                 public static _Configuration OpenMachineConfiguration (string locationSubPath)
 184                 {
 185                         return OpenMachineConfiguration ();
 186                 }
 187
 188                 [MonoLimitation("Mono does not support remote configuration")]
 189                 public static _Configuration OpenMachineConfiguration (string locationSubPath,
 190                                                                        string server)
 191                 {
 192                         if (server == null)
 193                                 return OpenMachineConfiguration (locationSubPath);
 194
 195                         throw new NotSupportedException ("Mono doesn't support remote configuration");
 196                 }
 197
 198                 [MonoLimitation("Mono does not support remote configuration")]
 199                 public static _Configuration OpenMachineConfiguration (string locationSubPath,
 200                                                                        string server,
 201                                                                        IntPtr userToken)
 202                 {
 203                         if (server == null)
 204                                 return OpenMachineConfiguration (locationSubPath);
 205                         throw new NotSupportedException ("Mono doesn't support remote configuration");
 206                 }
 207
 208                 [MonoLimitation("Mono does not support remote configuration")]
 209                 public static _Configuration OpenMachineConfiguration (string locationSubPath,
 210                                                                        string server,
 211                                                                        string userName,
 212                                                                        string password)
 213                 {
 214                         if (server == null)
 215                                 return OpenMachineConfiguration (locationSubPath);
 216                         throw new NotSupportedException ("Mono doesn't support remote configuration");
 217                 }
 218
 219                 public static _Configuration OpenWebConfiguration (string path)
 220                 {
 221                         return OpenWebConfiguration (path, null, null, null, null, null);
 222                 }
 223
 224                 public static _Configuration OpenWebConfiguration (string path, string site)
 225                 {
 226                         return OpenWebConfiguration (path, site, null, null, null, null);
 227                 }
 228
 229                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath)
 230                 {
 231                         return OpenWebConfiguration (path, site, locationSubPath, null, null, null);
 232                 }
 233
 234                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server)
 235                 {
 236                         return OpenWebConfiguration (path, site, locationSubPath, server, null, null);
 237                 }
 238
 239                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server, IntPtr userToken)
 240                 {
 241                         return OpenWebConfiguration (path, site, locationSubPath, server, null, null);
 242                 }
 243
 244                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server, string userName, string password)
 245                 {
 246                         return OpenWebConfiguration (path, site, locationSubPath, server, null, null, false);
 247                 }
 248
 249                 static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server, string userName, string password, bool fweb)
 250                 {
 251                         if (String.IsNullOrEmpty (path))
 252                                 path = "/";
 253
 254                         if (!fweb && !String.IsNullOrEmpty (path))
 255                                 path = FindWebConfig (path);
 256
 257                         string confKey = path + site + locationSubPath + server + userName + password;
 258                         _Configuration conf = null;
 259                         conf = (_Configuration) configurations [confKey];
 260                         if (conf == null) {
 261                                 try {
 262                                         conf = ConfigurationFactory.Create (typeof (WebConfigurationHost), null, path, site, locationSubPath, server, userName, password);
 263                                         configurations [confKey] = conf;
 264                                 } catch (Exception ex) {
 265                                         lock (hasConfigErrorsLock) {
 266                                                 hasConfigErrors = true;
 267                                         }
 268                                         throw ex;
 269                                 }
 270                         }
 271                         return conf;
 272                 }
 273
 274                 public static _Configuration OpenMappedWebConfiguration (WebConfigurationFileMap fileMap, string path)
 275                 {
 276                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap, path);
 277                 }
 278
 279                 public static _Configuration OpenMappedWebConfiguration (WebConfigurationFileMap fileMap, string path, string site)
 280                 {
 281                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap, path, site);
 282                 }
 283
 284                 public static _Configuration OpenMappedWebConfiguration (WebConfigurationFileMap fileMap, string path, string site, string locationSubPath)
 285                 {
 286                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap, path, site, locationSubPath);
 287                 }
 288
 289                 public static _Configuration OpenMappedMachineConfiguration (ConfigurationFileMap fileMap)
 290                 {
 291                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap);
 292                 }
 293
 294                 public static _Configuration OpenMappedMachineConfiguration (ConfigurationFileMap fileMap,
 295                                                                              string locationSubPath)
 296                 {
 297                         return OpenMappedMachineConfiguration (fileMap);
 298                 }
 299
 300                 internal static object SafeGetSection (string sectionName, Type configSectionType)
 301                 {
 302                         try {
 303                                 return GetSection (sectionName);
 304                         } catch (Exception) {
 305                                 if (configSectionType != null)
 306                                         return Activator.CreateInstance (configSectionType);
 307                                 return null;
 308                         }
 309                 }
 310
 311                 internal static object SafeGetSection (string sectionName, string path, Type configSectionType)
 312                 {
 313                         try {
 314                                 return GetSection (sectionName, path);
 315                         } catch (Exception) {
 316                                 if (configSectionType != null)
 317                                         return Activator.CreateInstance (configSectionType);
 318                                 return null;
 319                         }
 320                 }
 321
 322                 public static object GetSection (string sectionName)
 323                 {
 324                         HttpContext context = HttpContext.Current;
 325                         return GetSection (sectionName, GetCurrentPath (context), context);
 326                 }
 327
 328                 public static object GetSection (string sectionName, string path)
 329                 {
 330                         return GetSection (sectionName, path, HttpContext.Current);
 331                 }
 332
 333                 internal static object GetSection (string sectionName, string path, HttpContext context)
 334                 {
 335                         string config_vdir = FindWebConfig (path);
 336                         if (String.IsNullOrEmpty (config_vdir))
 337                                 config_vdir = "/";
 338
 339                         object cachedSection = sectionCache [GetSectionCacheKey (sectionName, config_vdir)];
 340                         if (cachedSection != null)
 341                                 return cachedSection;
 342
 343                         HttpRequest req = context != null ? context.Request : null;
 344                         _Configuration c = OpenWebConfiguration (config_vdir, //path, /* path */
 345                                                                  null, /* site */
 346                                                                  req != null ? VirtualPathUtility.GetDirectory (req.Path) : null, /* locationSubPath */
 347                                                                  null, /* server */
 348                                                                  null, /* userName */
 349                                                                  null, /* password */
 350                                                                  true  /* path from FindWebConfig */);
 351                         ConfigurationSection section = c.GetSection (sectionName);
 352                         if (section == null)
 353                                 return null;
 354
 355 #if TARGET_J2EE
 356                         object value = get_runtime_object.Invoke (section, new object [0]);
 357                         if (String.CompareOrdinal ("appSettings", sectionName) == 0) {
 358                                 NameValueCollection collection;
 359                                 collection = new KeyValueMergedCollection (HttpContext.Current, (NameValueCollection) value);
 360                                 value = collection;
 361                         }
 362
 363                         AddSectionToCache (GetSectionCacheKey (sectionName, config_vdir), value);
 364                         return value;
 365 #else
 366 #if MONOWEB_DEP
 367                         object value = SettingsMappingManager.MapSection (get_runtime_object.Invoke (section, new object [0]));
 368 #else
 369                         object value = null;
 370 #endif
 371                         AddSectionToCache (GetSectionCacheKey (sectionName, config_vdir), value);
 372                         return value;
 373 #endif
 374                 }
 375
 376                 static string MapPath (HttpRequest req, string virtualPath)
 377                 {
 378                         if (req != null)
 379                                 return req.MapPath (virtualPath);
 380
 381                         string appRoot = HttpRuntime.AppDomainAppVirtualPath;
 382                         if (!String.IsNullOrEmpty (appRoot) && virtualPath.StartsWith (appRoot, StringComparison.Ordinal)) {
 383                                 if (String.Compare (virtualPath, appRoot, StringComparison.Ordinal) == 0)
 384                                         return HttpRuntime.AppDomainAppPath;
 385                                 return UrlUtils.Combine (HttpRuntime.AppDomainAppPath, virtualPath.Substring (appRoot.Length));
 386                         }
 387
 388                         return null;
 389                 }
 390
 391                 static string GetParentDir (string rootPath, string curPath)
 392                 {
 393                         int len = curPath.Length - 1;
 394                         if (len > 0 && curPath [len] == '/')
 395                                 curPath = curPath.Substring (0, len);
 396
 397                         if (String.Compare (curPath, rootPath, StringComparison.Ordinal) == 0)
 398                                 return null;
 399
 400                         int idx = curPath.LastIndexOf ('/');
 401                         if (idx == -1)
 402                                 return curPath;
 403
 404                         if (idx == 0)
 405                                 return "/";
 406
 407                         return curPath.Substring (0, idx);
 408                 }
 409
 410                 internal static string FindWebConfig (string path)
 411                 {
 412                         if (String.IsNullOrEmpty (path))
 413                                 return path;
 414
 415                         string dir;
 416                         if (path [path.Length - 1] == '/')
 417                                 dir = path;
 418                         else {
 419                                 dir = VirtualPathUtility.GetDirectory (path, false);
 420                                 if (dir == null)
 421                                         return path;
 422                         }
 423
 424                         string curPath = configPaths [dir] as string;
 425                         if (curPath != null)
 426                                 return curPath;
 427
 428                         HttpContext ctx = HttpContext.Current;
 429                         HttpRequest req = ctx != null ? ctx.Request : null;
 430                         if (req == null)
 431                                 return path;
 432
 433                         curPath = path;
 434                         string rootPath = HttpRuntime.AppDomainAppVirtualPath;
 435                         string physPath;
 436
 437                         while (String.Compare (curPath, rootPath, StringComparison.Ordinal) != 0) {
 438                                 physPath = MapPath (req, curPath);
 439                                 if (physPath == null) {
 440                                         curPath = rootPath;
 441                                         break;
 442                                 }
 443
 444                                 if (WebConfigurationHost.GetWebConfigFileName (physPath) != null)
 445                                         break;
 446
 447                                 curPath = GetParentDir (rootPath, curPath);
 448                                 if (curPath == null) {
 449                                         curPath = rootPath;
 450                                         break;
 451                                 }
 452                         }
 453
 454                         configPaths [dir] = curPath;
 455                         return curPath;
 456                 }
 457
 458                 static string GetCurrentPath (HttpContext ctx)
 459                 {
 460                         HttpRequest req = ctx != null ? ctx.Request : null;
 461                         return req != null ? req.Path : HttpRuntime.AppDomainAppVirtualPath;
 462                 }
 463
 464                 internal static void RemoveConfigurationFromCache (HttpContext ctx)
 465                 {
 466                         configurations.Remove (GetCurrentPath (ctx));
 467                 }
 468
 469 #if TARGET_J2EE || MONOWEB_DEP
 470                 readonly static MethodInfo get_runtime_object = typeof (ConfigurationSection).GetMethod ("GetRuntimeObject", BindingFlags.NonPublic | BindingFlags.Instance);
 471 #endif
 472
 473                 public static object GetWebApplicationSection (string sectionName)
 474                 {
 475                         HttpContext ctx = HttpContext.Current;
 476                         HttpRequest req = ctx != null ? ctx.Request : null;
 477                         string applicationPath = req != null ? req.ApplicationPath : null;
 478                         return GetSection (sectionName, String.IsNullOrEmpty (applicationPath) ? String.Empty : applicationPath);
 479                 }
 480
 481                 public static NameValueCollection AppSettings {
 482                         get { return ConfigurationManager.AppSettings; }
 483                 }
 484
 485                 public static ConnectionStringSettingsCollection ConnectionStrings {
 486                         get { return ConfigurationManager.ConnectionStrings; }
 487                 }
 488
 489                 internal static IInternalConfigConfigurationFactory ConfigurationFactory {
 490                         get { return configFactory; }
 491                 }
 492
 493                 static void AddSectionToCache (int key, object section)
 494                 {
 495                         if (sectionCache [key] != null)
 496                                 return;
 497
 498                         Hashtable tmpTable = (Hashtable) sectionCache.Clone ();
 499                         if (tmpTable.Contains (key))
 500                                 return;
 501
 502                         tmpTable.Add (key, section);
 503                         sectionCache = tmpTable;
 504                 }
 505
 506                 static int GetSectionCacheKey (string sectionName, string path)
 507                 {
 508                         return (sectionName != null ? sectionName.GetHashCode () : 0) ^ ((path != null ? path.GetHashCode () : 0) + 37);
 509                 }
 510
 511
 512 #region stuff copied from WebConfigurationSettings
 513 #if TARGET_J2EE
 514                 static internal IConfigurationSystem oldConfig {
 515                         get {
 516                                 return (IConfigurationSystem)AppDomain.CurrentDomain.GetData("WebConfigurationManager.oldConfig");
 517                         }
 518                         set {
 519                                 AppDomain.CurrentDomain.SetData("WebConfigurationManager.oldConfig", value);
 520                         }
 521                 }
 522
 523                 static Web20DefaultConfig config {
 524                         get {
 525                                 return (Web20DefaultConfig) AppDomain.CurrentDomain.GetData ("Web20DefaultConfig.config");
 526                         }
 527                         set {
 528                                 AppDomain.CurrentDomain.SetData ("Web20DefaultConfig.config", value);
 529                         }
 530                 }
 531
 532                 static IInternalConfigSystem configSystem {
 533                         get {
 534                                 return (IInternalConfigSystem) AppDomain.CurrentDomain.GetData ("IInternalConfigSystem.configSystem");
 535                         }
 536                         set {
 537                                 AppDomain.CurrentDomain.SetData ("IInternalConfigSystem.configSystem", value);
 538                         }
 539                 }
 540 #else
 541                 static internal IConfigurationSystem oldConfig;
 542                 static Web20DefaultConfig config;
 543                 //static IInternalConfigSystem configSystem;
 544 #endif
 545                 const BindingFlags privStatic = BindingFlags.NonPublic | BindingFlags.Static;
 546                 static readonly object lockobj = new object ();
 547
 548                 internal static void Init ()
 549                 {
 550                         lock (lockobj) {
 551                                 if (config != null)
 552                                         return;
 553
 554                                 /* deal with the ConfigurationSettings stuff */
 555                                 {
 556                                         Web20DefaultConfig settings = Web20DefaultConfig.GetInstance ();
 557                                         Type t = typeof (ConfigurationSettings);
 558                                         MethodInfo changeConfig = t.GetMethod ("ChangeConfigurationSystem",
 559                                                                                privStatic);
 560
 561                                         if (changeConfig == null)
 562                                                 throw new ConfigurationException ("Cannot find method CCS");
 563
 564                                         object [] args = new object [] {settings};
 565                                         oldConfig = (IConfigurationSystem)changeConfig.Invoke (null, args);
 566                                         config = settings;
 567
 568                                         config.Init ();
 569                                 }
 570
 571                                 /* deal with the ConfigurationManager stuff */
 572                                 {
 573                                         HttpConfigurationSystem system = new HttpConfigurationSystem ();
 574                                         Type t = typeof (ConfigurationManager);
 575                                         MethodInfo changeConfig = t.GetMethod ("ChangeConfigurationSystem",
 576                                                                                privStatic);
 577
 578                                         if (changeConfig == null)
 579                                                 throw new ConfigurationException ("Cannot find method CCS");
 580
 581                                         object [] args = new object [] {system};
 582                                         changeConfig.Invoke (null, args);
 583                                         //configSystem = system;
 584                                 }
 585                         }
 586                 }
 587         }
 588
 589         class Web20DefaultConfig : IConfigurationSystem
 590         {
 591 #if TARGET_J2EE
 592                 static Web20DefaultConfig instance {
 593                         get {
 594                                 Web20DefaultConfig val = (Web20DefaultConfig)AppDomain.CurrentDomain.GetData("Web20DefaultConfig.instance");
 595                                 if (val == null) {
 596                                         val = new Web20DefaultConfig();
 597                                         AppDomain.CurrentDomain.SetData("Web20DefaultConfig.instance", val);
 598                                 }
 599                                 return val;
 600                         }
 601                         set {
 602                                 AppDomain.CurrentDomain.SetData("Web20DefaultConfig.instance", value);
 603                         }
 604                 }
 605 #else
 606                 static Web20DefaultConfig instance;
 607 #endif
 608
 609                 static Web20DefaultConfig ()
 610                 {
 611                         instance = new Web20DefaultConfig ();
 612                 }
 613
 614                 public static Web20DefaultConfig GetInstance ()
 615                 {
 616                         return instance;
 617                 }
 618
 619                 public object GetConfig (string sectionName)
 620                 {
 621                         object o = WebConfigurationManager.GetWebApplicationSection (sectionName);
 622
 623                         if (o == null || o is IgnoreSection) {
 624                                 /* this can happen when the section
 625                                  * handler doesn't subclass from
 626                                  * ConfigurationSection.  let's be
 627                                  * nice and try to load it using the
 628                                  * 1.x style routines in case there's
 629                                  * a 1.x section handler registered
 630                                  * for it.
 631                                  */
 632                                 object o1 = WebConfigurationManager.oldConfig.GetConfig (sectionName);
 633                                 if (o1 != null)
 634                                         return o1;
 635                         }
 636
 637                         return o;
 638                 }
 639
 640                 public void Init ()
 641                 {
 642                         // nothing. We need a context.
 643                 }
 644         }
 645
 646 #endregion
 647 }
 648
 649 #endif