Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / StaticResourceExtension.cs / 1 / StaticResourceExtension.cs
/****************************************************************************\ * * File: StaticResourceExtension.cs * * Class for Xaml markup extension for static resource references. * * Copyright (C) 2004 by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using System; using System.Collections; using System.Diagnostics; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Reflection; using MS.Internal; namespace System.Windows { ////// Class for Xaml markup extension for static resource references. /// [MarkupExtensionReturnType(typeof(object))] [Localizability(LocalizationCategory.NeverLocalize)] // cannot be localized public class StaticResourceExtension : MarkupExtension { ////// Constructor that takes no parameters /// public StaticResourceExtension() { } ////// Constructor that takes the resource key that this is a static reference to. /// public StaticResourceExtension( object resourceKey) { if (resourceKey == null) { throw new ArgumentNullException("resourceKey"); } _resourceKey = resourceKey; } ////// Return an object that should be set on the targetObject's targetProperty /// for this markup extension. For StaticResourceExtension, this is the object found in /// a resource dictionary in the current parent chain that is keyed by ResourceKey /// /// Object that can provide services for the markup extension. ////// The object to set on this property. /// public override object ProvideValue(IServiceProvider serviceProvider) { IProvideValueTarget provideValueTarget = null; IBamlReader bamlReader = null; if( serviceProvider != null ) { provideValueTarget = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget; bamlReader = serviceProvider.GetService(typeof(IBamlReader)) as IBamlReader; } if( bamlReader == null ) { throw new InvalidOperationException((SR.Get(SRID.StaticResourceInXamlOnly))); } if( provideValueTarget == null ) { throw new InvalidOperationException( SR.Get(SRID.MarkupExtensionNoContext, GetType().Name, "IProvideValueTarget" )); } return ProvideValueInternal( bamlReader, provideValueTarget.TargetObject, provideValueTarget.TargetProperty, false /*allowDeferredReference*/); } internal object ProvideValueInternal( IBamlReader bamlReader, object targetObject, object targetProperty, bool allowDeferredReference) { if (ResourceKey == null) { throw new InvalidOperationException(SR.Get(SRID.MarkupExtensionResourceKey)); } // Return a DeferredReference when set on a DependencyProperty in a Style bool deferReference = allowDeferredReference && (targetObject is FrameworkElementFactory || targetObject is Setter || targetObject is SharedDp); // Get prefetchedValue DeferredResourceReference prefetchedValue = PrefetchedValue; bool isValidPrefetchedValue = prefetchedValue != null && !prefetchedValue.IsUnset; // Find value BamlRecordReader bamlRecordReader = bamlReader.GetBamlReader() as BamlRecordReader; object value; if (prefetchedValue != null) { // If we have a prefetched value then we we need to look only in the parser stack not in the App or the theme. value = bamlRecordReader.FindResourceInParserStack(ResourceKey, deferReference, false/*mustReturnDeferredResourceReference*/); } else { // If we do not have a prefetched value it is a regular staticresource lookup and hence we must look in the parser stack and the app and the theme. value = bamlRecordReader.FindResourceInParentChain(ResourceKey, deferReference, false /*mustReturnDeferredResourceReference*/); } if (value == DependencyProperty.UnsetValue) { // If both the currently fetched value and the previously fetched value indicate that the // resource has not been found then it is time to throw an exception. if (!isValidPrefetchedValue) { bamlRecordReader.ThrowException(SRID.ParserNoResource , "{" + ResourceKey.ToString() + "}"); } else { if (!deferReference) { // Inflate the prefetched deferred resource reference, because the // current context does not support using deferred references. value = prefetchedValue.GetValue(BaseValueSourceInternal.Unknown); } else { // Use the prefetched value as is value = prefetchedValue; } } } return value; } ////// The key in a Resource Dictionary used to find the object refered to by this /// Markup Extension. /// [ConstructorArgument("resourceKey")] public object ResourceKey { get { return _resourceKey; } set { if (value == null) { throw new ArgumentNullException("value"); } _resourceKey = value; } } ////// This value is used to resolved StaticResourceIds /// internal virtual DeferredResourceReference PrefetchedValue { get { return null; } } private object _resourceKey; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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