/// <summary> /// Construct a new blob of metadata for a single control, performing any reflection needed to determine its /// structure and parsing behavior. /// </summary> /// <param name="compileContext">The context in which errors should be reported.</param> /// <param name="tag">The complete tag for this control, as found in the markup.</param> /// <param name="tagRegistrations">The known list of registrations, formed from the directives in the /// "web.config" and any <%@ Register %> directives in the markup.</param> /// <param name="assemblies">The complete list of known pre-loaded assemblies for reflection.</param> /// <param name="allowedTypes">The allowable types of control that may be returned. If the matching /// .NET class type for this control does not match one of these types (or is not derivable from one /// of these types), this constructor will throw an exception.</param> public ReflectedControl(ICompileContext compileContext, Tag tag, IEnumerable <TagRegistration> tagRegistrations, AssemblyLoader assemblies, IEnumerable <Type> allowedTypes) { // Decode the tag declaration. DecodeFullTagNameWithPrefix(tag.TagName, out TagPrefix, out TagName); // Find the matching C# type for that tag declaration. if (string.IsNullOrEmpty(TagPrefix)) { TagRegistration = _htmlTagRegistration; ControlType = FindMatchingHtmlControlType(tag); } else { ControlType = FindMatchingControlType(TagPrefix, TagName, tagRegistrations, assemblies, out TagRegistration); } if (ControlType == null) { throw new InvalidOperationException(string.Format("No matching type for <{0}> was found in any of the loaded assemblies.", tag.TagName)); } // If we are restricted to only load certain types (such as the nested not-a-control instances inside a DataPager control), // check that the control we have found matches one of those types. if (!allowedTypes.Any(t => t.IsAssignableFrom(ControlType))) { StringBuilder stringBuilder = new StringBuilder(); stringBuilder.AppendFormat("Found matching type for <{0}>, but it is a {1}, not one of the {2} allowed types:\r\n", tag.TagName, ControlType.FullName, allowedTypes.Count()); foreach (Type allowedType in allowedTypes) { stringBuilder.AppendFormat("- {0}\r\n", allowedType.FullName); } throw new InvalidOperationException(stringBuilder.ToString()); } // Extract the [ParseChildren] attribute, if it has one. System.Web.UI.ParseChildrenAttribute[] parseChildrenAttributes = (System.Web.UI.ParseChildrenAttribute[])ControlType.GetCustomAttributes(typeof(System.Web.UI.ParseChildrenAttribute), true); ParseChildrenAttribute = parseChildrenAttributes.Length == 0 ? null : parseChildrenAttributes[0]; // Extract the [ControlBuilder] attribute, if it has one. System.Web.UI.ControlBuilderAttribute[] controlBuilderAttributes = (System.Web.UI.ControlBuilderAttribute[])ControlType.GetCustomAttributes(typeof(System.Web.UI.ControlBuilderAttribute), true); ControlBuilderAttribute = controlBuilderAttributes.Length == 0 ? null : controlBuilderAttributes[0]; // Extract the type's properties, since their declarations control what's legal in the markup. ControlProperties = CollectControlProperties(compileContext, ControlType, this); // HtmlControls have to be handled specially, since they have [ParseChildren(true)] in many cases but // aren't really using it for anything. if (ControlType.Namespace == _htmlTagRegistration.Namespace) { ParseChildrenAttribute = new ParseChildrenAttribute(false); } // Validate the ParseChildrenAttribute, which may be broken or weird. if (ParseChildrenAttribute != null) { if (!string.IsNullOrEmpty(ParseChildrenAttribute.DefaultProperty)) { string propertyName = ParseChildrenAttribute.DefaultProperty.ToLower(); // ASP.NET also ignores case on this; see internals of ControlBuilder.CreateChildBuilder() for details. if (!ControlProperties.ContainsKey(propertyName)) { throw new InvalidOperationException(string.Format("The [ParseChildren] attribute on class \"{0}\" names a default property \"{1}\" that does not exist in that class.", ControlType.FullName, ParseChildrenAttribute.DefaultProperty)); } DefaultCollectionProperty = ControlProperties[propertyName]; if (!DefaultCollectionProperty.IsCollectionProperty) { throw new InvalidOperationException(string.Format("The [ParseChildren] attribute on class \"{0}\" names a default property \"{1}\" that is not a collection property. The default property must always be a collection property.", ControlType.FullName, ParseChildrenAttribute.DefaultProperty)); } } } }
/// <summary> /// Search through the given set of tag registrations and assemblies to find a suitable .NET class type that /// matches the given tag prefix and tag name. (This method handles server controls and user controls, not HTML /// controls; the tag prefix must not be empty.) /// </summary> /// <param name="tagPrefix">The tag prefix of the tag we're searching for.</param> /// <param name="tagName">The tag name of the tag we're searching for.</param> /// <param name="tagRegistrations">The known list of registrations, formed from the directives in the /// "web.config" and any <%@ Register %> directives in the markup.</param> /// <param name="assemblies">The complete list of known pre-loaded assemblies for reflection.</param> /// <param name="matchingTagRegistration">The matching tag registration for this tag prefix/name, if there is one.</param> /// <returns>The matching class type, if one exists, or null if there is no matching class type.</returns> private static Type FindMatchingControlType(string tagPrefix, string tagName, IEnumerable <TagRegistration> tagRegistrations, AssemblyLoader assemblies, out TagRegistration matchingTagRegistration) { // Since multiple tag registrations could match this declaration, we have no choice but to walk through // all of the tag registrations and just try to find the first one that matches. foreach (TagRegistration tagRegistration in tagRegistrations) { // Try the prefix first. If that doesn't match, it's definitely not what we're looking for. if (string.Compare(tagRegistration.TagPrefix, tagPrefix, StringComparison.InvariantCultureIgnoreCase) != 0) { continue; } switch (tagRegistration.Kind) { case TagRegistrationKind.SingleUserControl: if (string.Compare(tagRegistration.TagName, tagName, StringComparison.InvariantCultureIgnoreCase) == 0) { // We matched a registered user control, so we have to partially parse it to find out // what namespace in the website assembly is associated with it. Assembly assembly = assemblies.PrimaryAssembly; Type type = assembly.GetType(tagRegistration.Typename); // Make sure we found it, and that it's actually a UserControl of some kind. if (type == null || !typeof(System.Web.UI.UserControl).IsAssignableFrom(type)) { break; } // We found it, so return it. matchingTagRegistration = tagRegistration; return(type); } break; case TagRegistrationKind.Namespace: { // This registration describes an entire namespace worth of controls in an assembly somewhere. // So check see if tagName matches a class inside the given namespace in that assembly. Assembly assembly = assemblies[tagRegistration.AssemblyFilename]; Type type = assembly.GetType(tagRegistration.Namespace + "." + tagName, false, true); // Make sure we found it. if (type == null) { break; } // We found it, so return it. matchingTagRegistration = tagRegistration; return(type); } case TagRegistrationKind.HtmlControl: // Shouldn't be able to get here. throw new InvalidOperationException("Internal error; got an HtmlControl when attempting to process a registered user control or namespace."); } } matchingTagRegistration = null; return(null); }
/// <summary> /// Load the web.config file found at the given filename. /// </summary> public void LoadWebConfig(ICompileContext compileContext, string filename, string rootPath) { compileContext.Verbose("Loading and processing \"{0}\"...", filename); compileContext.VerboseNesting++; try { // Load and decode the XML itself. XDocument webConfig = XDocument.Load(filename); compileContext.Verbose("\"{0}\" loaded as an XDocument.", filename); // Find the <add> declarations in the <configuration><system.web><controls> section. IEnumerable <XElement> adds = ExtractAddSectionFromWebConfig(webConfig, filename); compileContext.Verbose("Found {0} <add> declarations.", adds.Count()); // Parse the <add> declarations into a TagRegistrations list. List <TagRegistration> tagRegistrations = new List <TagRegistration>(); foreach (XElement add in adds) { // Extract all the (important) attributes for this <add> declaration. XAttribute tagPrefixAttribute = add.Attribute("tagPrefix"); XAttribute tagNameAttribute = add.Attribute("tagName"); XAttribute srcAttribute = add.Attribute("src"); XAttribute namespaceAttribute = add.Attribute("namespace"); XAttribute assemblyAttribute = add.Attribute("assembly"); // Make sure this declaration makes sense; if not, just skip it and hope for the best. bool isValid = ValidateAddElement(compileContext, filename, tagPrefixAttribute, namespaceAttribute, tagNameAttribute, srcAttribute, assemblyAttribute); if (!isValid) { continue; } // It's valid, so decode it. TagRegistration tagRegistration; if (namespaceAttribute != null) { tagRegistration = new TagRegistration { Kind = TagRegistrationKind.Namespace, TagPrefix = (tagPrefixAttribute != null ? tagPrefixAttribute.Value : null), AssemblyFilename = (assemblyAttribute != null ? assemblyAttribute.Value : null), Namespace = namespaceAttribute.Value, }; compileContext.Verbose("Registering namespace: <{0}:*> now includes \"{1}\"{2}", tagRegistration.TagPrefix, tagRegistration.Namespace, string.IsNullOrEmpty(tagRegistration.AssemblyFilename) ? string.Empty : " in assembly \"" + tagRegistration.AssemblyFilename + "\""); } else { tagRegistration = new TagRegistration { Kind = TagRegistrationKind.SingleUserControl, TagPrefix = (tagPrefixAttribute != null ? tagPrefixAttribute.Value : null), TagName = (tagNameAttribute != null ? tagNameAttribute.Value : null), SourceFilename = (srcAttribute != null ? srcAttribute.Value : null), }; compileContext.Verbose("Registering user control: <{0}:{1}> is \"{2}\"", tagRegistration.TagPrefix, tagRegistration.TagName, tagRegistration.SourceFilename); } // And add it to the list of known tag registrations. tagRegistrations.Add(tagRegistration); } // If everything was successful, share the results with the world. WebConfig = webConfig; TagRegistrations = tagRegistrations; } finally { compileContext.VerboseNesting--; compileContext.Verbose("Finished processing \"{0}\".", filename); compileContext.Verbose(""); } }