Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / ComponentModel / DependencyPropertyKind.cs / 1305600 / DependencyPropertyKind.cs
namespace MS.Internal.ComponentModel { using System; using System.Windows; // // Determines what kind of DP we are dealing with. DependencyPropertyKind // is associated with a target type and a DP. It calculates IsAttached // and IsDirect on demand using the following rules: // // IsAttached is true iff: // // 1. The target type is not a registered owner of the DP, or // the target type is the DP's owner type. // // 2. The DP's owner type offers a public static Get method // with the same name as the DP. The method must // have the correct signature (one parameter that derives // from DependencyObject). // // IsDirect is true iff: // // 1. The target type is a registered owner of the DP. // // 2. The target type offers a public CLR property of the // same name as the DP. // // If neither of these is true the property is assumed to be internal // and therefore inaccessible to anyone via reflection. // // A property cannot be both attached and direct. If a property defines // both accessors direct accessors take precidence. // internal class DependencyPropertyKind { //------------------------------------------------------ // // Internal Constructors // //----------------------------------------------------- // // Creates a new instance // internal DependencyPropertyKind(DependencyProperty dp, Type targetType) { _dp = dp; _targetType = targetType; } //----------------------------------------------------- // // Internal Properties // //----------------------------------------------------- // // Returns true if the property is internal. // internal bool IsInternal { get { if (!_isInternalChecked) { // The property is internal if it has no public // static Get method or no public CLR accessor. If we already // calculated it to be a direct or attached property, bail because // it's clearly not internal. if (!_isAttached && !_isDirect) { if (DependencyObjectPropertyDescriptor.GetAttachedPropertyMethod(_dp) == null && _dp.OwnerType.GetProperty(_dp.Name) == null) { _isInternal = true; } } _isInternalChecked = true; } return _isInternal; } } // // Returns true if the property is attached for the target type. // internal bool IsAttached { get { if (!_isAttachedChecked) { // A property cannot be both attached and direct, // so if this property is already direct we have our // answer. Note that we check the IsDirect property // here to force evaluation. Direct takes precidence // over attached on the same object, so we need to // force the check if it hasn't been done. if (!IsDirect) { // If the attached property is AddOwnered to this type, we // don't treat it as attached because, by definition, attached // properties can only have one owner, and any AddOwnered version // beceomes a direct property. if (_dp.OwnerType == _targetType || _dp.OwnerType.IsAssignableFrom(_targetType) || DependencyProperty.FromName(_dp.Name, _targetType) != _dp) { if (DependencyObjectPropertyDescriptor.GetAttachedPropertyMethod(_dp) != null) { _isAttached = true; } } } _isAttachedChecked = true; } return _isAttached; } } // // Returns true if the property is direct for the target type. // internal bool IsDirect { get { if (!_isDirectChecked) { // If we've already calculated attached, we // know the answer if _isAttached is true because // a property cannot be both. // No need to also check _isAttachedChecked since this will // only be true if the check has been done. if (!_isAttached) { if (DependencyProperty.FromName(_dp.Name, _targetType) == _dp) { if (_targetType.GetProperty(_dp.Name) != null) { _isDirect = true; _isAttachedChecked = true; } } } _isDirectChecked = true; } return _isDirect; } } //------------------------------------------------------ // // Private Fields // //----------------------------------------------------- private readonly DependencyProperty _dp; private readonly Type _targetType; private bool _isAttached; private bool _isAttachedChecked; private bool _isInternal; private bool _isInternalChecked; private bool _isDirect; private bool _isDirectChecked; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ISO2022Encoding.cs
- SymDocumentType.cs
- HttpInputStream.cs
- PopupEventArgs.cs
- HtmlInputButton.cs
- Column.cs
- HtmlGenericControl.cs
- DockPanel.cs
- CodeAttributeArgumentCollection.cs
- PageStatePersister.cs
- TdsParserHelperClasses.cs
- BinaryReader.cs
- RuntimeTransactionHandle.cs
- UnionCqlBlock.cs
- HttpProxyTransportBindingElement.cs
- VirtualDirectoryMappingCollection.cs
- Span.cs
- DotNetATv1WindowsLogEntryDeserializer.cs
- XamlFigureLengthSerializer.cs
- EntitySqlQueryBuilder.cs
- File.cs
- CopyAttributesAction.cs
- OperationInvokerBehavior.cs
- XslException.cs
- DateTimeStorage.cs
- ToolStripPanelRow.cs
- DataGridViewCellContextMenuStripNeededEventArgs.cs
- InheritablePropertyChangeInfo.cs
- LinkArea.cs
- DataException.cs
- SpotLight.cs
- DefaultTextStoreTextComposition.cs
- ComponentChangedEvent.cs
- ItemType.cs
- MiniMapControl.xaml.cs
- Comparer.cs
- MatrixConverter.cs
- Nodes.cs
- GradientBrush.cs
- EntityProxyTypeInfo.cs
- XmlChoiceIdentifierAttribute.cs
- ErrorProvider.cs
- TemplateBindingExtensionConverter.cs
- UnaryOperationBinder.cs
- IndentedWriter.cs
- AuthenticationManager.cs
- ContextDataSource.cs
- SimpleType.cs
- InvalidDataContractException.cs
- MsmqIntegrationAppDomainProtocolHandler.cs
- NetworkStream.cs
- HtmlElement.cs
- HtmlLabelAdapter.cs
- ViewStateAttachedPropertyFeature.cs
- BindToObject.cs
- ThicknessAnimationUsingKeyFrames.cs
- Group.cs
- ImportRequest.cs
- StatusBarAutomationPeer.cs
- CompiledQueryCacheEntry.cs
- Win32PrintDialog.cs
- Merger.cs
- Stack.cs
- UrlMapping.cs
- BookmarkScopeHandle.cs
- HuffmanTree.cs
- DataSourceExpression.cs
- SettingsBindableAttribute.cs
- HwndAppCommandInputProvider.cs
- RectValueSerializer.cs
- SpotLight.cs
- WrappedOptions.cs
- PropertiesTab.cs
- ExpressionWriter.cs
- LogicalTreeHelper.cs
- HtmlEmptyTagControlBuilder.cs
- RuntimeWrappedException.cs
- IconConverter.cs
- SocketException.cs
- WebPartZone.cs
- SqlClientPermission.cs
- XmlUtil.cs
- PageAsyncTaskManager.cs
- SizeFConverter.cs
- ConnectionManagementElement.cs
- SecurityPermission.cs
- ZoneIdentityPermission.cs
- PointLight.cs
- HtmlMeta.cs
- ListDataBindEventArgs.cs
- FtpRequestCacheValidator.cs
- ClientCultureInfo.cs
- BoolExpr.cs
- SessionStateContainer.cs
- Vector3dCollection.cs
- UserInitiatedNavigationPermission.cs
- ColumnPropertiesGroup.cs
- WaitHandleCannotBeOpenedException.cs
- EditorZone.cs
- EntityDataSourceWrapper.cs