Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Objects / DataRecordObjectView.cs / 1 / DataRecordObjectView.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner jhutson // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Data.Common; using System.Data.Metadata; using System.Data.Metadata.Edm; using System.Reflection; namespace System.Data.Objects { ////// ObjectView that provides binding to a list of data records. /// ////// This class provides an implementation of ITypedList that returns property descriptors /// for each column of results in a data record. /// internal sealed class DataRecordObjectView : ObjectView, ITypedList { /// /// Cache of the property descriptors for the element type of the root list wrapped by ObjectView. /// private PropertyDescriptorCollection _propertyDescriptorsCache; ////// EDM RowType that describes the shape of record elements. /// private RowType _rowType; internal DataRecordObjectView(IObjectViewDataviewData, object eventDataSource, RowType rowType, Type propertyComponentType) : base(viewData, eventDataSource) { if (!typeof(IDataRecord).IsAssignableFrom(propertyComponentType)) { propertyComponentType = typeof(IDataRecord); } _rowType = rowType; _propertyDescriptorsCache = MaterializedDataRecord.CreatePropertyDescriptorCollection(_rowType, propertyComponentType, true); } /// /// Return a /// ///instance that represents /// a strongly-typed indexer property on the specified type. /// that may define the appropriate indexer. /// /// /// ///instance of indexer defined on supplied type /// that returns an object of any type but ; /// or null if no such indexer is defined on the supplied type. /// /// The algorithm here is lifted from System.Windows.Forms.ListBindingHelper, /// from the GetTypedIndexer method. /// The Entity Framework could not take a dependency on WinForms, /// so we lifted the appropriate parts from the WinForms code here. /// A bit ----, but much better than guessing as to what algorithm is proper for data binding. /// private static PropertyInfo GetTypedIndexer(Type type) { PropertyInfo indexer = null; if (typeof(IList).IsAssignableFrom(type) || typeof(ITypedList).IsAssignableFrom(type) || typeof(IListSource).IsAssignableFrom(type)) { System.Reflection.PropertyInfo[] props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance); for (int idx = 0; idx < props.Length; idx++) { if (props[idx].GetIndexParameters().Length > 0 && props[idx].PropertyType != typeof(object)) { indexer = props[idx]; //Prefer the standard indexer, if there is one if (indexer.Name == "Item") { break; } } } } return indexer; } ////// Return the element type for the supplied type. /// /// ////// If ///represents a list type that doesn't also implement ITypedList or IListSource, /// return the element type for items in that list. /// Otherwise, return the type supplied by . /// /// The algorithm here is lifted from System.Windows.Forms.ListBindingHelper, /// from the GetListItemType(object) method. /// The Entity Framework could not take a dependency on WinForms, /// so we lifted the appropriate parts from the WinForms code here. /// A bit ----, but much better than guessing as to what algorithm is proper for data binding. /// private static Type GetListItemType(Type type) { Type itemType; if (typeof(Array).IsAssignableFrom(type)) { itemType = type.GetElementType(); } else { PropertyInfo typedIndexer = GetTypedIndexer(type); if (typedIndexer != null) { itemType = typedIndexer.PropertyType; } else { itemType = type; } } return itemType; } #region ITypedList Members PropertyDescriptorCollection System.ComponentModel.ITypedList.GetItemProperties(PropertyDescriptor[] listAccessors) { PropertyDescriptorCollection propertyDescriptors; if (listAccessors == null || listAccessors.Length == 0) { // Caller is requesting property descriptors for the root element type. propertyDescriptors = _propertyDescriptorsCache; } else { // Use the last PropertyDescriptor in the array to build the collection of returned property descriptors. PropertyDescriptor propertyDescriptor = listAccessors[listAccessors.Length - 1]; FieldDescriptor fieldDescriptor = propertyDescriptor as FieldDescriptor; // If the property descriptor describes a data record with the EDM type of RowType, // construct the collection of property descriptors from the property's EDM metadata. // Otherwise use the CLR type of the property. if (fieldDescriptor != null && fieldDescriptor.EdmProperty != null && fieldDescriptor.EdmProperty.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.RowType) { // Retrieve property descriptors from EDM metadata. propertyDescriptors = MaterializedDataRecord.CreatePropertyDescriptorCollection((RowType)fieldDescriptor.EdmProperty.TypeUsage.EdmType, typeof(IDataRecord), true); } else { // Use the CLR type. propertyDescriptors = TypeDescriptor.GetProperties(GetListItemType(propertyDescriptor.PropertyType)); } } return propertyDescriptors; } string System.ComponentModel.ITypedList.GetListName(PropertyDescriptor[] listAccessors) { return _rowType.Name; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner jhutson // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Data.Common; using System.Data.Metadata; using System.Data.Metadata.Edm; using System.Reflection; namespace System.Data.Objects { ////// ObjectView that provides binding to a list of data records. /// ////// This class provides an implementation of ITypedList that returns property descriptors /// for each column of results in a data record. /// internal sealed class DataRecordObjectView : ObjectView, ITypedList { /// /// Cache of the property descriptors for the element type of the root list wrapped by ObjectView. /// private PropertyDescriptorCollection _propertyDescriptorsCache; ////// EDM RowType that describes the shape of record elements. /// private RowType _rowType; internal DataRecordObjectView(IObjectViewDataviewData, object eventDataSource, RowType rowType, Type propertyComponentType) : base(viewData, eventDataSource) { if (!typeof(IDataRecord).IsAssignableFrom(propertyComponentType)) { propertyComponentType = typeof(IDataRecord); } _rowType = rowType; _propertyDescriptorsCache = MaterializedDataRecord.CreatePropertyDescriptorCollection(_rowType, propertyComponentType, true); } /// /// Return a /// ///instance that represents /// a strongly-typed indexer property on the specified type. /// that may define the appropriate indexer. /// /// /// ///instance of indexer defined on supplied type /// that returns an object of any type but ; /// or null if no such indexer is defined on the supplied type. /// /// The algorithm here is lifted from System.Windows.Forms.ListBindingHelper, /// from the GetTypedIndexer method. /// The Entity Framework could not take a dependency on WinForms, /// so we lifted the appropriate parts from the WinForms code here. /// A bit ----, but much better than guessing as to what algorithm is proper for data binding. /// private static PropertyInfo GetTypedIndexer(Type type) { PropertyInfo indexer = null; if (typeof(IList).IsAssignableFrom(type) || typeof(ITypedList).IsAssignableFrom(type) || typeof(IListSource).IsAssignableFrom(type)) { System.Reflection.PropertyInfo[] props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance); for (int idx = 0; idx < props.Length; idx++) { if (props[idx].GetIndexParameters().Length > 0 && props[idx].PropertyType != typeof(object)) { indexer = props[idx]; //Prefer the standard indexer, if there is one if (indexer.Name == "Item") { break; } } } } return indexer; } ////// Return the element type for the supplied type. /// /// ////// If ///represents a list type that doesn't also implement ITypedList or IListSource, /// return the element type for items in that list. /// Otherwise, return the type supplied by . /// /// The algorithm here is lifted from System.Windows.Forms.ListBindingHelper, /// from the GetListItemType(object) method. /// The Entity Framework could not take a dependency on WinForms, /// so we lifted the appropriate parts from the WinForms code here. /// A bit ----, but much better than guessing as to what algorithm is proper for data binding. /// private static Type GetListItemType(Type type) { Type itemType; if (typeof(Array).IsAssignableFrom(type)) { itemType = type.GetElementType(); } else { PropertyInfo typedIndexer = GetTypedIndexer(type); if (typedIndexer != null) { itemType = typedIndexer.PropertyType; } else { itemType = type; } } return itemType; } #region ITypedList Members PropertyDescriptorCollection System.ComponentModel.ITypedList.GetItemProperties(PropertyDescriptor[] listAccessors) { PropertyDescriptorCollection propertyDescriptors; if (listAccessors == null || listAccessors.Length == 0) { // Caller is requesting property descriptors for the root element type. propertyDescriptors = _propertyDescriptorsCache; } else { // Use the last PropertyDescriptor in the array to build the collection of returned property descriptors. PropertyDescriptor propertyDescriptor = listAccessors[listAccessors.Length - 1]; FieldDescriptor fieldDescriptor = propertyDescriptor as FieldDescriptor; // If the property descriptor describes a data record with the EDM type of RowType, // construct the collection of property descriptors from the property's EDM metadata. // Otherwise use the CLR type of the property. if (fieldDescriptor != null && fieldDescriptor.EdmProperty != null && fieldDescriptor.EdmProperty.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.RowType) { // Retrieve property descriptors from EDM metadata. propertyDescriptors = MaterializedDataRecord.CreatePropertyDescriptorCollection((RowType)fieldDescriptor.EdmProperty.TypeUsage.EdmType, typeof(IDataRecord), true); } else { // Use the CLR type. propertyDescriptors = TypeDescriptor.GetProperties(GetListItemType(propertyDescriptor.PropertyType)); } } return propertyDescriptors; } string System.ComponentModel.ITypedList.GetListName(PropertyDescriptor[] listAccessors) { return _rowType.Name; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- TypeInformation.cs
- BuildProviderInstallComponent.cs
- LinkLabel.cs
- ObjectItemAttributeAssemblyLoader.cs
- XmlSchemaParticle.cs
- ListBoxChrome.cs
- MetadataItem.cs
- ReachNamespaceInfo.cs
- WebPartHelpVerb.cs
- DefinitionProperties.cs
- SafeEventLogWriteHandle.cs
- Error.cs
- IPEndPoint.cs
- OdbcErrorCollection.cs
- MasterPageCodeDomTreeGenerator.cs
- BitmapEffectDrawingContextWalker.cs
- UnknownBitmapDecoder.cs
- DelegateOutArgument.cs
- ColumnPropertiesGroup.cs
- BrowserDefinitionCollection.cs
- URI.cs
- CfgRule.cs
- Serializer.cs
- CodeCatchClause.cs
- FormViewInsertEventArgs.cs
- RegularExpressionValidator.cs
- TextOutput.cs
- DrawingImage.cs
- NetTcpSecurityElement.cs
- SessionEndingEventArgs.cs
- DataGridViewCheckBoxCell.cs
- GeometryModel3D.cs
- EncoderParameters.cs
- DataTableCollection.cs
- RequestedSignatureDialog.cs
- Ref.cs
- ConnectionPoint.cs
- HashHelper.cs
- NotSupportedException.cs
- NotificationContext.cs
- diagnosticsswitches.cs
- path.cs
- MasterPageBuildProvider.cs
- HorizontalAlignConverter.cs
- KeyMatchBuilder.cs
- IgnoreFileBuildProvider.cs
- ByteConverter.cs
- HtmlInputHidden.cs
- RegisteredDisposeScript.cs
- WebProxyScriptElement.cs
- AnimatedTypeHelpers.cs
- AuthenticationService.cs
- MatcherBuilder.cs
- ValidatedMobileControlConverter.cs
- ClientTargetCollection.cs
- FigureParagraph.cs
- TextEditorDragDrop.cs
- MatrixAnimationUsingPath.cs
- WebPartCancelEventArgs.cs
- ObfuscationAttribute.cs
- DataBoundControlHelper.cs
- WindowPattern.cs
- Vector3DCollectionValueSerializer.cs
- ScriptIgnoreAttribute.cs
- DateTimeHelper.cs
- HijriCalendar.cs
- TraceContextEventArgs.cs
- AssociationSetMetadata.cs
- NullableDoubleAverageAggregationOperator.cs
- InfoCardCryptoHelper.cs
- UserControlFileEditor.cs
- CatalogPart.cs
- RoleManagerEventArgs.cs
- MessageBox.cs
- DeclaredTypeValidator.cs
- FlowLayoutSettings.cs
- IProvider.cs
- XmlILModule.cs
- SqlConnection.cs
- SqlMethodCallConverter.cs
- DataServiceKeyAttribute.cs
- Selection.cs
- EntityDataSourceChangedEventArgs.cs
- DataGridViewCellPaintingEventArgs.cs
- XhtmlTextWriter.cs
- TransformerInfo.cs
- InstanceCompleteException.cs
- LiteralTextContainerControlBuilder.cs
- ConfigXmlText.cs
- SQLBoolean.cs
- ControlPaint.cs
- LockedAssemblyCache.cs
- ByeOperationCD1AsyncResult.cs
- HiddenField.cs
- ManipulationStartedEventArgs.cs
- MemoryResponseElement.cs
- ComPlusThreadInitializer.cs
- GlobalizationAssembly.cs
- XamlReaderHelper.cs
- _StreamFramer.cs