WpfXamlLoader.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Markup / WpfXamlLoader.cs / 1407647 / WpfXamlLoader.cs
                        
                        
                            using System; 
using System.Collections;
using System.Xaml;
using System.Xaml.Permissions;
using MS.Internal; 
using MS.Internal.Xaml.Context;
using MS.Internal.Utility; 
using MS.Utility; 
using System.Windows.Baml2006;
 
namespace System.Windows.Markup
{
    internal class WpfXamlLoader
    { 
        private static Lazy XmlSpace = new Lazy(() => new WpfXamlMember(XmlAttributeProperties.XmlSpaceProperty, true));
 
        public static object Load(System.Xaml.XamlReader xamlReader, bool skipJournaledProperties, Uri baseUri) 
        {
            XamlObjectWriterSettings settings = XamlReader.CreateObjectWriterSettings(); 
            object result = WpfXamlLoader.Load(xamlReader, null, skipJournaledProperties, null, settings, baseUri);
            EnsureXmlNamespaceMaps(result, xamlReader.SchemaContext);
            return result;
        } 

        public static object LoadDeferredContent(System.Xaml.XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, 
            bool skipJournaledProperties, Object rootObject, XamlObjectWriterSettings parentSettings, Uri baseUri) 
        {
            XamlObjectWriterSettings settings = XamlReader.CreateObjectWriterSettings(parentSettings); 
            // Don't set settings.RootObject because this isn't the real root
            return Load(xamlReader, writerFactory, skipJournaledProperties, rootObject, settings, baseUri);
        }
 
        public static object LoadBaml(System.Xaml.XamlReader xamlReader, bool skipJournaledProperties,
            Object rootObject, XamlAccessLevel accessLevel, Uri baseUri) 
        { 
            XamlObjectWriterSettings settings = XamlReader.CreateObjectWriterSettingsForBaml();
            settings.RootObjectInstance = rootObject; 
            settings.AccessLevel = accessLevel;
            object result = Load(xamlReader, null, skipJournaledProperties, rootObject, settings, baseUri);
            EnsureXmlNamespaceMaps(result, xamlReader.SchemaContext);
            return result; 
        }
 
        internal static void EnsureXmlNamespaceMaps(object rootObject, XamlSchemaContext schemaContext) 
        {
            DependencyObject depObj = rootObject as DependencyObject; 
            if (depObj == null)
            {
                return;
            } 
            // If a user passed in custom mappings via XamlTypeMapper, we need to preserve thos
            // in the XmlNamespaceMaps property. Otherwise, we can just leave it empty and let all 
            // type resolutions fall back to the shared SchemaContext. 
            var typeMapperContext = schemaContext as XamlTypeMapper.XamlTypeMapperSchemaContext;
            Hashtable namespaceMaps; 
            if (typeMapperContext == null)
            {
                namespaceMaps = new Hashtable();
            } 
            else
            { 
                namespaceMaps = typeMapperContext.GetNamespaceMapHashList(); 
            }
            depObj.SetValue(XmlAttributeProperties.XmlNamespaceMapsProperty, namespaceMaps); 
        }

        private static object Load(System.Xaml.XamlReader xamlReader, IXamlObjectWriterFactory writerFactory,
            bool skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri) 
        {
            XamlObjectWriter xamlWriter = null; 
            XamlContextStack stack = new XamlContextStack(() => new WpfXamlFrame()); 
            int persistId = 1;
 
            settings.AfterBeginInitHandler = delegate(object sender, System.Xaml.XamlObjectEventArgs args)
            {
                if (EventTrace.IsEnabled(EventTrace.Keyword.KeywordXamlBaml | EventTrace.Keyword.KeywordPerf, EventTrace.Level.Verbose))
                { 
                    IXamlLineInfo ixli = xamlReader as IXamlLineInfo;
 
                    int lineNumber = -1; 
                    int linePosition = -1;
 
                    if (ixli != null && ixli.HasLineInfo)
                    {
                        lineNumber = ixli.LineNumber;
                        linePosition = ixli.LinePosition; 
                    }
 
                    EventTrace.EventProvider.TraceEvent( 
                        EventTrace.Event.WClientParseXamlBamlInfo,
                        EventTrace.Keyword.KeywordXamlBaml | EventTrace.Keyword.KeywordPerf, EventTrace.Level.Verbose, 
                        args.Instance == null ? 0 : PerfService.GetPerfElementID(args.Instance),
                        lineNumber,
                        linePosition);
                } 

                UIElement uiElement = args.Instance as UIElement; 
                if (uiElement != null) 
                {
                    uiElement.SetPersistId(persistId++); 
                }

                DependencyObject dObject = args.Instance as DependencyObject;
                if (dObject != null && stack.CurrentFrame.XmlnsDictionary != null) 
                {
                    XmlnsDictionary dictionary = stack.CurrentFrame.XmlnsDictionary; 
                    dictionary.Seal(); 

                    XmlAttributeProperties.SetXmlnsDictionary(dObject, dictionary); 
                }

                stack.CurrentFrame.Instance = args.Instance;
            }; 
            if (writerFactory != null)
            { 
                xamlWriter = writerFactory.GetXamlObjectWriter(settings); 
            }
            else 
            {
                xamlWriter = new System.Xaml.XamlObjectWriter(xamlReader.SchemaContext, settings);
            }
 
            IXamlLineInfo xamlLineInfo = null;
            try 
            { 
                //Handle Line Numbers
                xamlLineInfo = xamlReader as IXamlLineInfo; 
                IXamlLineInfoConsumer xamlLineInfoConsumer = xamlWriter as IXamlLineInfoConsumer;
                bool shouldPassLineNumberInfo = false;
                if ((xamlLineInfo != null && xamlLineInfo.HasLineInfo)
                    && (xamlLineInfoConsumer != null && xamlLineInfoConsumer.ShouldProvideLineInfo)) 
                {
                    shouldPassLineNumberInfo = true; 
                } 

                IStyleConnector styleConnector = rootObject as IStyleConnector; 
                TransformNodes(xamlReader, xamlWriter,
                    false /*onlyLoadOneNode*/,
                    skipJournaledProperties,
                    shouldPassLineNumberInfo, xamlLineInfo, xamlLineInfoConsumer, 
                    stack, styleConnector);
                xamlWriter.Close(); 
                return xamlWriter.Result; 
            }
            catch (Exception e) 
            {
                // Don't wrap critical exceptions or already-wrapped exceptions.
                if (MS.Internal.CriticalExceptions.IsCriticalException(e) || !XamlReader.ShouldReWrapException(e, baseUri))
                { 
                    throw;
                } 
                XamlReader.RewrapException(e, xamlLineInfo, baseUri); 
                return null;    // this should never be executed
            } 
        }

        internal static void TransformNodes(System.Xaml.XamlReader xamlReader, System.Xaml.XamlObjectWriter xamlWriter,
                                         bool onlyLoadOneNode, 
                                         bool skipJournaledProperties,
                                         bool shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, 
                                         XamlContextStack stack, 
                                         IStyleConnector styleConnector)
        { 
            while (xamlReader.Read())
            {
                if (shouldPassLineNumberInfo)
                { 
                    if (xamlLineInfo.LineNumber != 0)
                    { 
                        xamlLineInfoConsumer.SetLineInfo(xamlLineInfo.LineNumber, xamlLineInfo.LinePosition); 
                    }
                } 

                switch (xamlReader.NodeType)
                {
                case System.Xaml.XamlNodeType.NamespaceDeclaration: 
                    xamlWriter.WriteNode(xamlReader);
                    if (stack.Depth == 0 || stack.CurrentFrame.Type != null) 
                    { 
                        stack.PushScope();
                        // Need to create an XmlnsDictionary. 
                        // Look up stack to see if we have one earlier
                        //  If so, use that.  Otherwise new a xmlnsDictionary
                        WpfXamlFrame iteratorFrame = stack.CurrentFrame;
                        while (iteratorFrame != null) 
                        {
                            if (iteratorFrame.XmlnsDictionary != null) 
                            { 
                                stack.CurrentFrame.XmlnsDictionary =
                                    new XmlnsDictionary(iteratorFrame.XmlnsDictionary); 
                                break;
                            }
                            iteratorFrame = (WpfXamlFrame)iteratorFrame.Previous;
                        } 
                        if (stack.CurrentFrame.XmlnsDictionary == null)
                        { 
                            stack.CurrentFrame.XmlnsDictionary = 
                                     new XmlnsDictionary();
                        } 
                    }
                    stack.CurrentFrame.XmlnsDictionary.Add(xamlReader.Namespace.Prefix, xamlReader.Namespace.Namespace);
                    break;
                case System.Xaml.XamlNodeType.StartObject: 
                    xamlWriter.WriteNode(xamlReader);
                    // If there's a frame but no Type, that means there 
                    // was a namespace. Just set the Type 
                    if (stack.Depth != 0 && stack.CurrentFrame.Type == null)
                    { 
                        stack.CurrentFrame.Type = xamlReader.Type;
                    }
                    else
                    { 
                        // Propagate the FreezeFreezable property from the current stack frame
                        stack.PushScope(); 
                        stack.CurrentFrame.Type = xamlReader.Type; 
                        if (stack.PreviousFrame.FreezeFreezable)
                        { 
                            stack.CurrentFrame.FreezeFreezable = true;
                        }
                    }
                    break; 
                case System.Xaml.XamlNodeType.GetObject:
                    xamlWriter.WriteNode(xamlReader); 
                    // If there wasn't a namespace node before this get object, need to pushScope. 
                    if (stack.CurrentFrame.Type != null)
                    { 
                        stack.PushScope();
                    }
                    stack.CurrentFrame.Type = stack.PreviousFrame.Property.Type;
                    break; 
                case System.Xaml.XamlNodeType.EndObject:
                    xamlWriter.WriteNode(xamlReader); 
                    // Freeze if required 
                    if (stack.CurrentFrame.FreezeFreezable)
                    { 
                        Freezable freezable = xamlWriter.Result as Freezable;
                        if (freezable != null && freezable.CanFreeze)
                        {
                            freezable.Freeze(); 
                        }
                    } 
                    DependencyObject dependencyObject = xamlWriter.Result as DependencyObject; 
                    if (dependencyObject != null && stack.CurrentFrame.XmlSpace.HasValue)
                    { 
                        XmlAttributeProperties.SetXmlSpace(dependencyObject, stack.CurrentFrame.XmlSpace.Value ? "default" : "preserve");
                    }
                    stack.PopScope();
                    break; 
                case System.Xaml.XamlNodeType.StartMember:
                    // ObjectWriter should NOT process PresentationOptions:Freeze directive since it is Unknown 
                    // The space directive node stream should not be written because it induces object instantiation, 
                    // and the Baml2006Reader can produce space directives prematurely.
                    if (!(xamlReader.Member.IsDirective && xamlReader.Member == XamlReaderHelper.Freeze) && 
                        xamlReader.Member != XmlSpace.Value &&
                        xamlReader.Member != XamlLanguage.Space)
                    {
                        xamlWriter.WriteNode(xamlReader); 
                    }
 
                    stack.CurrentFrame.Property = xamlReader.Member; 
                    if (skipJournaledProperties)
                    { 
                        if (!stack.CurrentFrame.Property.IsDirective)
                        {
                            System.Windows.Baml2006.WpfXamlMember wpfMember = stack.CurrentFrame.Property as System.Windows.Baml2006.WpfXamlMember;
                            if (wpfMember != null) 
                            {
                                DependencyProperty prop = wpfMember.DependencyProperty; 
 
                                if (prop != null)
                                { 
                                    FrameworkPropertyMetadata metadata = prop.GetMetadata(stack.CurrentFrame.Type.UnderlyingType) as FrameworkPropertyMetadata;
                                    if (metadata != null && metadata.Journal == true)
                                    {
                                        // 
                                        int count = 1;
                                        while (xamlReader.Read()) 
                                        { 
                                            switch (xamlReader.NodeType)
                                            { 
                                            case System.Xaml.XamlNodeType.StartMember:
                                                count++;
                                                break;
                                            case System.Xaml.XamlNodeType.EndMember: 
                                                count--;
                                                if (count == 0) 
                                                { 
                                                    xamlWriter.WriteNode(xamlReader);
                                                } 
                                                break;
                                            }
                                            if (count == 0)
                                                break; 
                                        }
                                        // shouldn't this have been a XamlReader.Skip()? 
                                        System.Diagnostics.Debug.Assert(count == 0, "Mismatch StartMember/EndMember"); 
                                    }
                                } 
                            }
                        }
                    }
                    break; 
                case System.Xaml.XamlNodeType.EndMember:
                    WpfXamlFrame currentFrame = stack.CurrentFrame; 
                    XamlMember currentProperty = currentFrame.Property; 
                    // ObjectWriter should not process PresentationOptions:Freeze directive nodes since it is unknown
                    // The space directive node stream should not be written because it induces object instantiation, 
                    // and the Baml2006Reader can produce space directives prematurely.
                    if (!(currentProperty.IsDirective && currentProperty == XamlReaderHelper.Freeze) &&
                        currentProperty != XmlSpace.Value &&
                        currentProperty != XamlLanguage.Space) 
                    {
                        xamlWriter.WriteNode(xamlReader); 
                    } 
                    currentFrame.Property = null;
                    break; 
                case System.Xaml.XamlNodeType.Value:
                    if (stack.CurrentFrame.Property.IsDirective && stack.CurrentFrame.Property == XamlLanguage.Shared)
                    {
                        bool isShared; 
                        if (bool.TryParse(xamlReader.Value as string, out isShared))
                        { 
                            if (!isShared) 
                            {
                                if (!(xamlReader is Baml2006Reader)) 
                                {
                                    throw new XamlParseException(SR.Get(SRID.SharedAttributeInLooseXaml));
                                }
                            } 
                        }
                    } 
                    // ObjectWriter should not process PresentationOptions:Freeze directive nodes since it is unknown 
                    if (stack.CurrentFrame.Property.IsDirective && stack.CurrentFrame.Property == XamlReaderHelper.Freeze)
                    { 
                        bool freeze = Convert.ToBoolean(xamlReader.Value, TypeConverterHelper.InvariantEnglishUS);
                        stack.CurrentFrame.FreezeFreezable = freeze;
                        var bamlReader = xamlReader as System.Windows.Baml2006.Baml2006Reader;
                        if (bamlReader != null) 
                        {
                            bamlReader.FreezeFreezables = freeze; 
                        } 
                    }
                    // The space directive node stream should not be written because it induces object instantiation, 
                    // and the Baml2006Reader can produce space directives prematurely.
                    else if (stack.CurrentFrame.Property == XmlSpace.Value || stack.CurrentFrame.Property == XamlLanguage.Space)
                    {
                        if (typeof(DependencyObject).IsAssignableFrom(stack.CurrentFrame.Type.UnderlyingType)) 
                        {
                            System.Diagnostics.Debug.Assert(xamlReader.Value is string, "XmlAttributeProperties.XmlSpaceProperty has the type string."); 
                            stack.CurrentFrame.XmlSpace = (string)xamlReader.Value == "default"; 
                        }
                    } 
                    else
                    {
                        // Ideally we should check if we're inside FrameworkTemplate's Content and not register those.
                        // However, checking if the instance is null accomplishes the same with a much smaller perf impact. 
                        if (styleConnector != null &&
                            stack.CurrentFrame.Instance != null && 
                            stack.CurrentFrame.Property == XamlLanguage.ConnectionId && 
                            typeof(Style).IsAssignableFrom(stack.CurrentFrame.Type.UnderlyingType))
                        { 
                            styleConnector.Connect((int)xamlReader.Value, stack.CurrentFrame.Instance);
                        }

                        xamlWriter.WriteNode(xamlReader); 
                    }
                    break; 
                default: 
                    xamlWriter.WriteNode(xamlReader);
                    break; 
                }

                //Only do this loop for one node if loadAsync
                if (onlyLoadOneNode) 
                {
                    return; 
                } 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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