mcs/class/System.Web/System.Web.UI/TemplateParser.cs

   1 //
   2 // System.Web.UI.TemplateParser
   3 //
   4 // Authors:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (C) 2002,2003 Ximian, Inc. (http://www.ximian.com)
   9 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.CodeDom.Compiler;
  32 using System.Collections;
  33 using System.IO;
  34 using System.Reflection;
  35 using System.Security.Permissions;
  36 using System.Web.Compilation;
  37 using System.Web.Configuration;
  38 using System.Web.Util;
  39
  40 namespace System.Web.UI {
  41
  42         // CAS
  43         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  44         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  45         public abstract class TemplateParser : BaseParser
  46         {
  47                 string inputFile;
  48                 string text;
  49                 string privateBinPath;
  50                 Hashtable mainAttributes;
  51                 ArrayList dependencies;
  52                 ArrayList assemblies;
  53                 Hashtable anames;
  54                 ArrayList imports;
  55                 ArrayList interfaces;
  56                 ArrayList scripts;
  57                 Type baseType;
  58                 string className;
  59                 RootBuilder rootBuilder;
  60                 bool debug;
  61                 string compilerOptions;
  62                 string language;
  63                 bool strictOn = false;
  64                 bool explicitOn = false;
  65                 bool output_cache;
  66                 int oc_duration;
  67                 string oc_header, oc_custom, oc_param, oc_controls;
  68                 bool oc_shared;
  69                 OutputCacheLocation oc_location;
  70 #if NET_2_0
  71                 string src;
  72                 string partialClassName;
  73 #endif
  74                 Assembly srcAssembly;
  75                 int appAssemblyIndex = -1;
  76
  77                 internal TemplateParser ()
  78                 {
  79                         imports = new ArrayList ();
  80                         imports.Add ("System");
  81                         imports.Add ("System.Collections");
  82                         imports.Add ("System.Collections.Specialized");
  83                         imports.Add ("System.Configuration");
  84                         imports.Add ("System.Text");
  85                         imports.Add ("System.Text.RegularExpressions");
  86                         imports.Add ("System.Web");
  87                         imports.Add ("System.Web.Caching");
  88                         imports.Add ("System.Web.Security");
  89                         imports.Add ("System.Web.SessionState");
  90                         imports.Add ("System.Web.UI");
  91                         imports.Add ("System.Web.UI.WebControls");
  92                         imports.Add ("System.Web.UI.HtmlControls");
  93
  94                         assemblies = new ArrayList ();
  95 #if NET_2_0
  96                         bool addAssembliesInBin = false;
  97                         foreach (AssemblyInfo info in CompilationConfig.Assemblies) {
  98                                 if (info.Assembly == "*")
  99                                         addAssembliesInBin = true;
 100                                 else
 101                                         AddAssemblyByName (info.Assembly);
 102                         }
 103                         if (addAssembliesInBin)
 104                                 AddAssembliesInBin ();
 105 #else
 106                         foreach (string a in CompilationConfig.Assemblies)
 107                                 AddAssemblyByName (a);
 108                         if (CompilationConfig.AssembliesInBin)
 109                                 AddAssembliesInBin ();
 110 #endif
 111
 112                         language = CompilationConfig.DefaultLanguage;
 113                 }
 114
 115                 internal void AddApplicationAssembly ()
 116                 {
 117                         string location = Context.ApplicationInstance.AssemblyLocation;
 118                         if (location != typeof (TemplateParser).Assembly.Location) {
 119                                 appAssemblyIndex = assemblies.Add (location);
 120                         }
 121                 }
 122
 123                 protected abstract Type CompileIntoType ();
 124
 125                 internal virtual void HandleOptions (object obj)
 126                 {
 127                 }
 128
 129                 internal static string GetOneKey (Hashtable tbl)
 130                 {
 131                         foreach (object key in tbl.Keys)
 132                                 return key.ToString ();
 133
 134                         return null;
 135                 }
 136
 137                 internal virtual void AddDirective (string directive, Hashtable atts)
 138                 {
 139                         if (String.Compare (directive, DefaultDirectiveName, true) == 0) {
 140                                 if (mainAttributes != null)
 141                                         ThrowParseException ("Only 1 " + DefaultDirectiveName + " is allowed");
 142
 143                                 mainAttributes = atts;
 144                                 ProcessMainAttributes (mainAttributes);
 145                                 return;
 146                         }
 147
 148                         int cmp = String.Compare ("Assembly", directive, true);
 149                         if (cmp == 0) {
 150                                 string name = GetString (atts, "Name", null);
 151                                 string src = GetString (atts, "Src", null);
 152
 153                                 if (atts.Count > 0)
 154                                         ThrowParseException ("Attribute " + GetOneKey (atts) + " unknown.");
 155
 156                                 if (name == null && src == null)
 157                                         ThrowParseException ("You gotta specify Src or Name");
 158
 159                                 if (name != null && src != null)
 160                                         ThrowParseException ("Src and Name cannot be used together");
 161
 162                                 if (name != null) {
 163                                         AddAssemblyByName (name);
 164                                 } else {
 165                                         GetAssemblyFromSource (src);
 166                                 }
 167
 168                                 return;
 169                         }
 170
 171                         cmp = String.Compare ("Import", directive, true);
 172                         if (cmp == 0) {
 173                                 string namesp = GetString (atts, "Namespace", null);
 174                                 if (atts.Count > 0)
 175                                         ThrowParseException ("Attribute " + GetOneKey (atts) + " unknown.");
 176
 177                                 if (namesp != null && namesp != "")
 178                                         AddImport (namesp);
 179                                 return;
 180                         }
 181
 182                         cmp = String.Compare ("Implements", directive, true);
 183                         if (cmp == 0) {
 184                                 string ifacename = GetString (atts, "Interface", "");
 185
 186                                 if (atts.Count > 0)
 187                                         ThrowParseException ("Attribute " + GetOneKey (atts) + " unknown.");
 188
 189                                 Type iface = LoadType (ifacename);
 190                                 if (iface == null)
 191                                         ThrowParseException ("Cannot find type " + ifacename);
 192
 193                                 if (!iface.IsInterface)
 194                                         ThrowParseException (iface + " is not an interface");
 195
 196                                 AddInterface (iface.FullName);
 197                                 return;
 198                         }
 199
 200                         cmp = String.Compare ("OutputCache", directive, true);
 201                         if (cmp == 0) {
 202                                 output_cache = true;
 203
 204                                 if (atts ["Duration"] == null)
 205                                         ThrowParseException ("The directive is missing a 'duration' attribute.");
 206                                 if (atts ["VaryByParam"] == null)
 207                                         ThrowParseException ("This directive is missing a 'VaryByParam' " +
 208                                                         "attribute, which should be set to \"none\", \"*\", " +
 209                                                         "or a list of name/value pairs.");
 210
 211                                 foreach (DictionaryEntry entry in atts) {
 212                                         string key = (string) entry.Key;
 213                                         switch (key.ToLower ()) {
 214                                         case "duration":
 215                                                 oc_duration = Int32.Parse ((string) entry.Value);
 216                                                 if (oc_duration < 1)
 217                                                         ThrowParseException ("The 'duration' attribute must be set " +
 218                                                                         "to a positive integer value");
 219                                                 break;
 220                                         case "varybyparam":
 221                                                 oc_param = (string) entry.Value;
 222                                                 if (String.Compare (oc_param, "none") == 0)
 223                                                         oc_param = null;
 224                                                 break;
 225                                         case "varybyheader":
 226                                                 oc_header = (string) entry.Value;
 227                                                 break;
 228                                         case "varybycustom":
 229                                                 oc_custom = (string) entry.Value;
 230                                                 break;
 231                                         case "location":
 232                                                 if (!(this is PageParser))
 233                                                         goto default;
 234
 235                                                 try {
 236                                                         oc_location = (OutputCacheLocation) Enum.Parse (
 237                                                                 typeof (OutputCacheLocation), (string) entry.Value, true);
 238                                                 } catch {
 239                                                         ThrowParseException ("The 'location' attribute is case sensitive and " +
 240                                                                         "must be one of the following values: Any, Client, " +
 241                                                                         "Downstream, Server, None, ServerAndClient.");
 242                                                 }
 243                                                 break;
 244                                         case "varybycontrol":
 245                                                 if (this is PageParser)
 246                                                         goto default;
 247
 248                                                 oc_controls = (string) entry.Value;
 249                                                 break;
 250                                         case "shared":
 251                                                 if (this is PageParser)
 252                                                         goto default;
 253
 254                                                 try {
 255                                                         oc_shared = Boolean.Parse ((string) entry.Value);
 256                                                 } catch {
 257                                                         ThrowParseException ("The 'shared' attribute is case sensitive" +
 258                                                                         " and must be set to 'true' or 'false'.");
 259                                                 }
 260                                                 break;
 261                                         default:
 262                                                 ThrowParseException ("The '" + key + "' attribute is not " +
 263                                                                 "supported by the 'Outputcache' directive.");
 264                                                 break;
 265                                         }
 266
 267                                 }
 268
 269                                 return;
 270                         }
 271
 272                         ThrowParseException ("Unknown directive: " + directive);
 273                 }
 274
 275                 internal Type LoadType (string typeName)
 276                 {
 277                         // First try loaded assemblies, then try assemblies in Bin directory.
 278                         Type type = null;
 279                         bool seenBin = false;
 280                         Assembly [] assemblies = AppDomain.CurrentDomain.GetAssemblies ();
 281                         foreach (Assembly ass in assemblies) {
 282                                 type = ass.GetType (typeName);
 283                                 if (type == null)
 284                                         continue;
 285
 286                                 if (Path.GetDirectoryName (ass.Location) != PrivateBinPath) {
 287                                         AddAssembly (ass, true);
 288                                 } else {
 289                                         seenBin = true;
 290                                 }
 291
 292                                 AddDependency (ass.Location);
 293                                 return type;
 294                         }
 295
 296                         if (seenBin)
 297                                 return null;
 298
 299                         // Load from bin
 300                         if (!Directory.Exists (PrivateBinPath))
 301                                 return null;
 302
 303                         string [] binDlls = Directory.GetFiles (PrivateBinPath, "*.dll");
 304                         foreach (string s in binDlls) {
 305                                 Assembly binA = Assembly.LoadFrom (s);
 306                                 type = binA.GetType (typeName);
 307                                 if (type == null)
 308                                         continue;
 309
 310                                 AddDependency (binA.Location);
 311                                 return type;
 312                         }
 313
 314                         return null;
 315                 }
 316
 317                 void AddAssembliesInBin ()
 318                 {
 319                         if (!Directory.Exists (PrivateBinPath))
 320                                 return;
 321
 322                         string [] binDlls = Directory.GetFiles (PrivateBinPath, "*.dll");
 323                         foreach (string s in binDlls) {
 324                                 assemblies.Add (s);
 325                         }
 326                 }
 327
 328                 internal virtual void AddInterface (string iface)
 329                 {
 330                         if (interfaces == null)
 331                                 interfaces = new ArrayList ();
 332
 333                         if (!interfaces.Contains (iface))
 334                                 interfaces.Add (iface);
 335                 }
 336
 337                 internal virtual void AddImport (string namesp)
 338                 {
 339                         if (imports == null)
 340                                 imports = new ArrayList ();
 341
 342                         if (!imports.Contains (namesp))
 343                                 imports.Add (namesp);
 344                 }
 345
 346                 internal virtual void AddSourceDependency (string filename)
 347                 {
 348                         if (dependencies != null && dependencies.Contains (filename)) {
 349                                 ThrowParseException ("Circular file references are not allowed. File: " + filename);
 350                         }
 351
 352                         AddDependency (filename);
 353                 }
 354
 355                 internal virtual void AddDependency (string filename)
 356                 {
 357                         if (filename == "")
 358                                 return;
 359
 360                         if (dependencies == null)
 361                                 dependencies = new ArrayList ();
 362
 363                         if (!dependencies.Contains (filename))
 364                                 dependencies.Add (filename);
 365                 }
 366
 367                 internal virtual void AddAssembly (Assembly assembly, bool fullPath)
 368                 {
 369                         if (assembly.Location == "")
 370                                 return;
 371
 372                         if (anames == null)
 373                                 anames = new Hashtable ();
 374
 375                         string name = assembly.GetName ().Name;
 376                         string loc = assembly.Location;
 377                         if (fullPath) {
 378                                 if (!assemblies.Contains (loc)) {
 379                                         assemblies.Add (loc);
 380                                 }
 381
 382                                 anames [name] = loc;
 383                                 anames [loc] = assembly;
 384                         } else {
 385                                 if (!assemblies.Contains (name)) {
 386                                         assemblies.Add (name);
 387                                 }
 388
 389                                 anames [name] = assembly;
 390                         }
 391                 }
 392
 393                 internal virtual Assembly AddAssemblyByFileName (string filename)
 394                 {
 395                         Assembly assembly = null;
 396                         Exception error = null;
 397
 398                         try {
 399                                 assembly = Assembly.LoadFrom (filename);
 400                         } catch (Exception e) { error = e; }
 401
 402                         if (assembly == null)
 403                                 ThrowParseException ("Assembly " + filename + " not found", error);
 404
 405                         AddAssembly (assembly, true);
 406                         return assembly;
 407                 }
 408
 409                 internal virtual Assembly AddAssemblyByName (string name)
 410                 {
 411                         if (anames == null)
 412                                 anames = new Hashtable ();
 413
 414                         if (anames.Contains (name)) {
 415                                 object o = anames [name];
 416                                 if (o is string)
 417                                         o = anames [o];
 418
 419                                 return (Assembly) o;
 420                         }
 421
 422                         Assembly assembly = null;
 423                         Exception error = null;
 424                         if (name.IndexOf (',') != -1) {
 425                                 try {
 426                                         assembly = Assembly.Load (name);
 427                                 } catch (Exception e) { error = e; }
 428                         }
 429
 430                         if (assembly == null) {
 431                                 try {
 432                                         assembly = Assembly.LoadWithPartialName (name);
 433                                 } catch (Exception e) { error = e; }
 434                         }
 435
 436                         if (assembly == null)
 437                                 ThrowParseException ("Assembly " + name + " not found", error);
 438
 439                         AddAssembly (assembly, true);
 440                         return assembly;
 441                 }
 442
 443                 internal virtual void ProcessMainAttributes (Hashtable atts)
 444                 {
 445                         atts.Remove ("Description"); // ignored
 446 #if NET_1_1
 447                         atts.Remove ("CodeBehind");  // ignored
 448 #endif
 449                         atts.Remove ("AspCompat"); // ignored
 450
 451                         debug = GetBool (atts, "Debug", true);
 452                         compilerOptions = GetString (atts, "CompilerOptions", "");
 453                         language = GetString (atts, "Language", CompilationConfig.DefaultLanguage);
 454                         strictOn = GetBool (atts, "Strict", CompilationConfig.Strict);
 455                         explicitOn = GetBool (atts, "Explicit", CompilationConfig.Explicit);
 456
 457                         string inherits = GetString (atts, "Inherits", null);
 458 #if NET_2_0
 459                         // In ASP 2, the source file is actually integrated with
 460                         // the generated file via the use of partial classes. This
 461                         // means that the code file has to be confirmed, but not
 462                         // used at this point.
 463                         src = GetString (atts, "CodeFile", null);
 464
 465                         if (src != null && inherits != null) {
 466                                 // Make sure the source exists
 467                                 src = UrlUtils.Combine (BaseVirtualDir, src);
 468                                 string realPath = MapPath (src, false);
 469                                 if (!File.Exists (realPath))
 470                                         ThrowParseException ("File " + src + " not found");
 471
 472                                 // Verify that the inherits is a valid identify not a
 473                                 // fully-qualified name.
 474                                 if (!CodeGenerator.IsValidLanguageIndependentIdentifier (inherits))
 475                                         ThrowParseException (String.Format ("'{0}' is not valid for 'inherits'", inherits));
 476
 477                                 // We are going to create a partial class that shares
 478                                 // the same name as the inherits tag, so reset the
 479                                 // name. The base type is changed because it is the
 480                                 // code file's responsibilty to extend the classes
 481                                 // needed.
 482                                 partialClassName = inherits;
 483
 484                                 // Add the code file as an option to the
 485                                 // compiler. This lets both files be compiled at once.
 486                                 compilerOptions += " \"" + realPath + "\"";
 487                         } else if (inherits != null) {
 488                                 // We just set the inherits directly because this is a
 489                                 // Single-Page model.
 490                                 SetBaseType (inherits);
 491                         }
 492 #else
 493                         string src = GetString (atts, "Src", null);
 494
 495                         if (src != null)
 496                                 srcAssembly = GetAssemblyFromSource (src);
 497
 498                         if (inherits != null)
 499                                 SetBaseType (inherits);
 500
 501                         className = GetString (atts, "ClassName", null);
 502                         if (className != null && !CodeGenerator.IsValidLanguageIndependentIdentifier (className))
 503                                 ThrowParseException (String.Format ("'{0}' is not valid for 'className'", className));
 504 #endif
 505
 506                         if (atts.Count > 0)
 507                                 ThrowParseException ("Unknown attribute: " + GetOneKey (atts));
 508                 }
 509
 510                 internal void SetBaseType (string type)
 511                 {
 512                         if (type == DefaultBaseTypeName)
 513                                 return;
 514
 515                         Type parent = null;
 516                         if (srcAssembly != null)
 517                                 parent = srcAssembly.GetType (type);
 518
 519                         if (parent == null)
 520                                 parent = LoadType (type);
 521
 522                         if (parent == null)
 523                                 ThrowParseException ("Cannot find type " + type);
 524
 525                         if (!DefaultBaseType.IsAssignableFrom (parent))
 526                                 ThrowParseException ("The parent type does not derive from " + DefaultBaseType);
 527
 528                         baseType = parent;
 529                 }
 530
 531                 Assembly GetAssemblyFromSource (string vpath)
 532                 {
 533                         vpath = UrlUtils.Combine (BaseVirtualDir, vpath);
 534                         string realPath = MapPath (vpath, false);
 535                         if (!File.Exists (realPath))
 536                                 ThrowParseException ("File " + vpath + " not found");
 537
 538                         AddSourceDependency (realPath);
 539
 540                         CompilerResults result = CachingCompiler.Compile (language, realPath, realPath, assemblies);
 541                         if (result.NativeCompilerReturnValue != 0) {
 542                                 StreamReader reader = new StreamReader (realPath);
 543                                 throw new CompilationException (realPath, result.Errors, reader.ReadToEnd ());
 544                         }
 545
 546                         AddAssembly (result.CompiledAssembly, true);
 547                         return result.CompiledAssembly;
 548                 }
 549
 550                 internal abstract Type DefaultBaseType { get; }
 551                 internal abstract string DefaultBaseTypeName { get; }
 552                 internal abstract string DefaultDirectiveName { get; }
 553
 554                 internal string InputFile
 555                 {
 556                         get { return inputFile; }
 557                         set { inputFile = value; }
 558                 }
 559
 560 #if NET_2_0
 561                 internal bool IsPartial
 562                 {
 563                         get { return src != null; }
 564                 }
 565
 566                 internal string PartialClassName
 567                 {
 568                         get { return partialClassName; }
 569                 }
 570 #endif
 571
 572                 internal string Text
 573                 {
 574                         get { return text; }
 575                         set { text = value; }
 576                 }
 577
 578                 internal Type BaseType
 579                 {
 580                         get {
 581                                 if (baseType == null)
 582                                         baseType = DefaultBaseType;
 583
 584                                 return baseType;
 585                         }
 586                 }
 587
 588                 internal string ClassName {
 589                         get {
 590                                 if (className != null)
 591                                         return className;
 592
 593                                 className = Path.GetFileName (inputFile).Replace ('.', '_');
 594                                 className = className.Replace ('-', '_');
 595                                 className = className.Replace (' ', '_');
 596
 597                                 if (Char.IsDigit(className[0])) {
 598                                         className = "_" + className;
 599                                 }
 600
 601                                 return className;
 602                         }
 603                 }
 604
 605                 internal string PrivateBinPath {
 606                         get {
 607                                 if (privateBinPath != null)
 608                                         return privateBinPath;
 609
 610                                 AppDomainSetup setup = AppDomain.CurrentDomain.SetupInformation;
 611                                 privateBinPath = Path.Combine (setup.ApplicationBase, setup.PrivateBinPath);
 612
 613                                 return privateBinPath;
 614                         }
 615                 }
 616
 617                 internal ArrayList Scripts {
 618                         get {
 619                                 if (scripts == null)
 620                                         scripts = new ArrayList ();
 621
 622                                 return scripts;
 623                         }
 624                 }
 625
 626                 internal ArrayList Imports {
 627                         get { return imports; }
 628                 }
 629
 630                 internal ArrayList Assemblies {
 631                         get {
 632                                 if (appAssemblyIndex != -1) {
 633                                         object o = assemblies [appAssemblyIndex];
 634                                         assemblies.RemoveAt (appAssemblyIndex);
 635                                         assemblies.Add (o);
 636                                         appAssemblyIndex = -1;
 637                                 }
 638
 639                                 return assemblies;
 640                         }
 641                 }
 642
 643                 internal ArrayList Interfaces {
 644                         get { return interfaces; }
 645                 }
 646
 647                 internal RootBuilder RootBuilder {
 648                         get { return rootBuilder; }
 649                         set { rootBuilder = value; }
 650                 }
 651
 652                 internal ArrayList Dependencies {
 653                         get { return dependencies; }
 654                         set { dependencies = value; }
 655                 }
 656
 657                 internal string CompilerOptions {
 658                         get { return compilerOptions; }
 659                 }
 660
 661                 internal string Language {
 662                         get { return language; }
 663                 }
 664
 665                 internal bool StrictOn {
 666                         get { return strictOn; }
 667                 }
 668
 669                 internal bool ExplicitOn {
 670                         get { return explicitOn; }
 671                 }
 672
 673                 internal bool Debug {
 674                         get { return debug; }
 675                 }
 676
 677                 internal bool OutputCache {
 678                         get { return output_cache; }
 679                 }
 680
 681                 internal int OutputCacheDuration {
 682                         get { return oc_duration; }
 683                 }
 684
 685                 internal string OutputCacheVaryByHeader {
 686                         get { return oc_header; }
 687                 }
 688
 689                 internal string OutputCacheVaryByCustom {
 690                         get { return oc_custom; }
 691                 }
 692
 693                 internal string OutputCacheVaryByControls {
 694                         get { return oc_controls; }
 695                 }
 696
 697                 internal bool OutputCacheShared {
 698                         get { return oc_shared; }
 699                 }
 700
 701                 internal OutputCacheLocation OutputCacheLocation {
 702                         get { return oc_location; }
 703                 }
 704
 705                 internal string OutputCacheVaryByParam {
 706                         get { return oc_param; }
 707                 }
 708
 709 #if NET_2_0
 710                 internal PagesSection PagesConfig {
 711                         get {
 712                                 return WebConfigurationManager.GetSection ("system.web/pages") as PagesSection;
 713                         }
 714                 }
 715 #else
 716                 internal PagesConfiguration PagesConfig {
 717                         get { return PagesConfiguration.GetInstance (Context); }
 718                 }
 719 #endif
 720         }
 721 }
 722