Code:
/ 4.0 / 4.0 / 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. 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
- DetailsViewUpdateEventArgs.cs
- AuthenticatingEventArgs.cs
- DictionaryContent.cs
- BaseHashHelper.cs
- WorkflowFormatterBehavior.cs
- ValueProviderWrapper.cs
- ObjectConverter.cs
- WizardDesigner.cs
- ListItemParagraph.cs
- Zone.cs
- PersonalizationEntry.cs
- Int16Converter.cs
- HTTPNotFoundHandler.cs
- _LocalDataStore.cs
- PtsPage.cs
- Material.cs
- Baml2006ReaderFrame.cs
- SystemIPv6InterfaceProperties.cs
- DPAPIProtectedConfigurationProvider.cs
- Span.cs
- UrlAuthorizationModule.cs
- Pens.cs
- PerfProviderCollection.cs
- XmlSerializationWriter.cs
- CodeBlockBuilder.cs
- counter.cs
- ListViewItem.cs
- DesignerValidatorAdapter.cs
- NavigationWindowAutomationPeer.cs
- wgx_sdk_version.cs
- HtmlProps.cs
- DocumentViewerConstants.cs
- SqlTransaction.cs
- BitArray.cs
- ReadOnlyDataSource.cs
- IndexerNameAttribute.cs
- GridViewDeletedEventArgs.cs
- GridViewRowEventArgs.cs
- XmlQueryStaticData.cs
- NoneExcludedImageIndexConverter.cs
- Empty.cs
- MoveSizeWinEventHandler.cs
- ObjectDataSourceFilteringEventArgs.cs
- UniqueConstraint.cs
- FlatButtonAppearance.cs
- DataColumnMappingCollection.cs
- DependencyPropertyKey.cs
- FileDialogPermission.cs
- WebFaultClientMessageInspector.cs
- HtmlElementEventArgs.cs
- ChannelManager.cs
- DataGridToolTip.cs
- SecurityContextSecurityTokenParameters.cs
- BuildManager.cs
- QueryOutputWriter.cs
- TcpSocketManager.cs
- COM2IProvidePropertyBuilderHandler.cs
- UnicastIPAddressInformationCollection.cs
- SpeakCompletedEventArgs.cs
- PagedDataSource.cs
- XhtmlTextWriter.cs
- UnknownBitmapDecoder.cs
- RegexGroup.cs
- SqlMultiplexer.cs
- GeometryGroup.cs
- RadioButtonList.cs
- BufferedWebEventProvider.cs
- ListDictionary.cs
- OdbcConnectionPoolProviderInfo.cs
- Pkcs9Attribute.cs
- CorrelationActionMessageFilter.cs
- TextEditorLists.cs
- BitmapEffectGroup.cs
- WmlLiteralTextAdapter.cs
- AsyncCompletedEventArgs.cs
- UserPreferenceChangingEventArgs.cs
- ConfigXmlElement.cs
- VariableQuery.cs
- CollectionDataContract.cs
- HtmlShimManager.cs
- DbBuffer.cs
- ConditionalAttribute.cs
- VectorAnimation.cs
- ParagraphResult.cs
- CreateParams.cs
- PeerDuplexChannel.cs
- DetailsViewDeletedEventArgs.cs
- RuleSetDialog.Designer.cs
- ADMembershipUser.cs
- PageContentAsyncResult.cs
- DirtyTextRange.cs
- WebPartDescriptionCollection.cs
- WebPartDisplayModeCollection.cs
- StringFunctions.cs
- TextWriter.cs
- ClaimComparer.cs
- Baml2006ReaderContext.cs
- DataObjectCopyingEventArgs.cs
- StateMachine.cs
- AsyncPostBackTrigger.cs