Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Objects / ObjectViewQueryResultData.cs / 1 / ObjectViewQueryResultData.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; using System.Data.Common; using System.Data.Metadata; using System.Data.Metadata.Edm; using System.Data.Objects.DataClasses; using System.Diagnostics; namespace System.Data.Objects { ////// Manages a binding list constructed from query results. /// ////// Type of the elements in the binding list. /// ////// The binding list is initialized from query results. /// If the binding list can be modified, /// objects are added or removed from the ObjectStateManager (via the ObjectContext). /// internal sealed class ObjectViewQueryResultData: IObjectViewData { private List _bindingList; /// /// ObjectContext used to add or delete objects when the list can be modified. /// private ObjectContext _objectContext; ////// If the TElement type is an Entity type of some kind, /// this field specifies the entity set to add entity objects. /// private EntitySet _entitySet; private bool _canEditItems; private bool _canModifyList; ////// Construct a new instance of the ObjectViewQueryResultData class using the supplied query results. /// /// /// Result of object query execution used to populate the binding list. /// /// /// ObjectContext used to add or remove items. /// If the binding list can be modified, this parameter should not be null. /// /// /// True if items should not be allowed to be added or removed from the binding list. /// Note that other conditions may prevent the binding list from being modified, so a value of false /// supplied for this parameter doesn't necessarily mean that the list will be writable. /// /// /// If the TElement type is an Entity type of some kind, /// this field specifies the entity set to add entity objects. /// internal ObjectViewQueryResultData(IEnumerable queryResults, ObjectContext objectContext, bool forceReadOnlyList, EntitySet entitySet) { bool canTrackItemChanges = typeof(IEntityWithChangeTracker).IsAssignableFrom(typeof(TElement)); _objectContext = objectContext; _entitySet = entitySet; _canEditItems = canTrackItemChanges; _canModifyList = !forceReadOnlyList && canTrackItemChanges && _objectContext != null; _bindingList = new List(); foreach (TElement element in queryResults) { _bindingList.Add(element); } } /// /// Throw an exception is an entity set was not specified for this instance. /// private void EnsureEntitySet() { if (_entitySet == null) { throw EntityUtil.CannotResolveTheEntitySetforGivenEntity(typeof(TElement)); } } #region IObjectViewDataMembers public IList List { get { return _bindingList; } } public bool AllowNew { get { return _canModifyList && _entitySet != null; } } public bool AllowEdit { get { return _canEditItems; } } public bool AllowRemove { get { return _canModifyList; } } public bool FiresEventOnAdd { get { return false; } } public bool FiresEventOnRemove { get { return true; } } public bool FiresEventOnClear { get { return false; } } public void EnsureCanAddNew() { EnsureEntitySet(); } public int Add(TElement item, bool isAddNew) { EnsureEntitySet(); Debug.Assert(_objectContext != null, "ObjectContext is null."); Debug.Assert(item is IEntityWithChangeTracker, "Item to add is not an IEntityWithChangeTracker."); // If called for AddNew operation, add item to binding list, pending addition to ObjectContext. if (!isAddNew) { _objectContext.AddObject(TypeHelpers.GetFullName(_entitySet), item); } _bindingList.Add(item); return _bindingList.Count - 1; } public void CommitItemAt(int index) { EnsureEntitySet(); Debug.Assert(_objectContext != null, "ObjectContext is null."); TElement item = _bindingList[index]; _objectContext.AddObject(TypeHelpers.GetFullName(_entitySet), item); } public void Clear() { while (0 < _bindingList.Count) { TElement entity = _bindingList[_bindingList.Count - 1]; Remove(entity, false); } } public bool Remove(TElement item, bool isCancelNew) { bool removed; Debug.Assert(_objectContext != null, "ObjectContext is null."); if (isCancelNew) { // Item was previously added to binding list, but not ObjectContext. removed = _bindingList.Remove(item); } else { ObjectStateEntry stateEntry = _objectContext.ObjectStateManager.FindObjectStateEntry(item); if (stateEntry != null) { stateEntry.Delete(); // OnCollectionChanged event will be fired, where the binding list will be updated. removed = true; } else { removed = false; } } return removed; } public ListChangedEventArgs OnCollectionChanged(object sender, CollectionChangeEventArgs e, ObjectViewListener listener) { ListChangedEventArgs changeArgs = null; // Since event is coming from cache and it might be shared amoung different queries // we have to check to see if correct event is being handled. if (e.Element.GetType().IsAssignableFrom(typeof(TElement)) && _bindingList.Contains((TElement)(e.Element))) { TElement item = (TElement)e.Element; int itemIndex = _bindingList.IndexOf(item); if (itemIndex >= 0) // Ignore entities that we don't know about. { // Only process "remove" events. Debug.Assert(e.Action != CollectionChangeAction.Refresh, "Cache should never fire with refresh, it does not have clear"); if (e.Action == CollectionChangeAction.Remove) { _bindingList.Remove(item); listener.UnregisterEntityEvents(item); changeArgs = new ListChangedEventArgs(ListChangedType.ItemDeleted, itemIndex /* newIndex*/, -1 /* oldIndex*/); } } } return changeArgs; } #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; using System.Data.Common; using System.Data.Metadata; using System.Data.Metadata.Edm; using System.Data.Objects.DataClasses; using System.Diagnostics; namespace System.Data.Objects { ////// Manages a binding list constructed from query results. /// ////// Type of the elements in the binding list. /// ////// The binding list is initialized from query results. /// If the binding list can be modified, /// objects are added or removed from the ObjectStateManager (via the ObjectContext). /// internal sealed class ObjectViewQueryResultData: IObjectViewData { private List _bindingList; /// /// ObjectContext used to add or delete objects when the list can be modified. /// private ObjectContext _objectContext; ////// If the TElement type is an Entity type of some kind, /// this field specifies the entity set to add entity objects. /// private EntitySet _entitySet; private bool _canEditItems; private bool _canModifyList; ////// Construct a new instance of the ObjectViewQueryResultData class using the supplied query results. /// /// /// Result of object query execution used to populate the binding list. /// /// /// ObjectContext used to add or remove items. /// If the binding list can be modified, this parameter should not be null. /// /// /// True if items should not be allowed to be added or removed from the binding list. /// Note that other conditions may prevent the binding list from being modified, so a value of false /// supplied for this parameter doesn't necessarily mean that the list will be writable. /// /// /// If the TElement type is an Entity type of some kind, /// this field specifies the entity set to add entity objects. /// internal ObjectViewQueryResultData(IEnumerable queryResults, ObjectContext objectContext, bool forceReadOnlyList, EntitySet entitySet) { bool canTrackItemChanges = typeof(IEntityWithChangeTracker).IsAssignableFrom(typeof(TElement)); _objectContext = objectContext; _entitySet = entitySet; _canEditItems = canTrackItemChanges; _canModifyList = !forceReadOnlyList && canTrackItemChanges && _objectContext != null; _bindingList = new List(); foreach (TElement element in queryResults) { _bindingList.Add(element); } } /// /// Throw an exception is an entity set was not specified for this instance. /// private void EnsureEntitySet() { if (_entitySet == null) { throw EntityUtil.CannotResolveTheEntitySetforGivenEntity(typeof(TElement)); } } #region IObjectViewDataMembers public IList List { get { return _bindingList; } } public bool AllowNew { get { return _canModifyList && _entitySet != null; } } public bool AllowEdit { get { return _canEditItems; } } public bool AllowRemove { get { return _canModifyList; } } public bool FiresEventOnAdd { get { return false; } } public bool FiresEventOnRemove { get { return true; } } public bool FiresEventOnClear { get { return false; } } public void EnsureCanAddNew() { EnsureEntitySet(); } public int Add(TElement item, bool isAddNew) { EnsureEntitySet(); Debug.Assert(_objectContext != null, "ObjectContext is null."); Debug.Assert(item is IEntityWithChangeTracker, "Item to add is not an IEntityWithChangeTracker."); // If called for AddNew operation, add item to binding list, pending addition to ObjectContext. if (!isAddNew) { _objectContext.AddObject(TypeHelpers.GetFullName(_entitySet), item); } _bindingList.Add(item); return _bindingList.Count - 1; } public void CommitItemAt(int index) { EnsureEntitySet(); Debug.Assert(_objectContext != null, "ObjectContext is null."); TElement item = _bindingList[index]; _objectContext.AddObject(TypeHelpers.GetFullName(_entitySet), item); } public void Clear() { while (0 < _bindingList.Count) { TElement entity = _bindingList[_bindingList.Count - 1]; Remove(entity, false); } } public bool Remove(TElement item, bool isCancelNew) { bool removed; Debug.Assert(_objectContext != null, "ObjectContext is null."); if (isCancelNew) { // Item was previously added to binding list, but not ObjectContext. removed = _bindingList.Remove(item); } else { ObjectStateEntry stateEntry = _objectContext.ObjectStateManager.FindObjectStateEntry(item); if (stateEntry != null) { stateEntry.Delete(); // OnCollectionChanged event will be fired, where the binding list will be updated. removed = true; } else { removed = false; } } return removed; } public ListChangedEventArgs OnCollectionChanged(object sender, CollectionChangeEventArgs e, ObjectViewListener listener) { ListChangedEventArgs changeArgs = null; // Since event is coming from cache and it might be shared amoung different queries // we have to check to see if correct event is being handled. if (e.Element.GetType().IsAssignableFrom(typeof(TElement)) && _bindingList.Contains((TElement)(e.Element))) { TElement item = (TElement)e.Element; int itemIndex = _bindingList.IndexOf(item); if (itemIndex >= 0) // Ignore entities that we don't know about. { // Only process "remove" events. Debug.Assert(e.Action != CollectionChangeAction.Refresh, "Cache should never fire with refresh, it does not have clear"); if (e.Action == CollectionChangeAction.Remove) { _bindingList.Remove(item); listener.UnregisterEntityEvents(item); changeArgs = new ListChangedEventArgs(ListChangedType.ItemDeleted, itemIndex /* newIndex*/, -1 /* oldIndex*/); } } } return changeArgs; } #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
- CodeObject.cs
- versioninfo.cs
- IISMapPath.cs
- QuadraticBezierSegment.cs
- Util.cs
- ObjectDataSourceMethodEditor.cs
- SlotInfo.cs
- GcSettings.cs
- ObjectSecurityT.cs
- ImplicitInputBrush.cs
- DesignerActionItemCollection.cs
- Label.cs
- InvalidOleVariantTypeException.cs
- ContextQuery.cs
- HandleCollector.cs
- HtmlWindowCollection.cs
- RightsManagementEncryptedStream.cs
- EventBindingService.cs
- BitmapSizeOptions.cs
- SubstitutionDesigner.cs
- FrugalList.cs
- TrackingConditionCollection.cs
- GcHandle.cs
- DbXmlEnabledProviderManifest.cs
- RequestQueryParser.cs
- dbenumerator.cs
- TakeOrSkipWhileQueryOperator.cs
- FontWeights.cs
- MetafileHeaderWmf.cs
- PageVisual.cs
- TdsParserStateObject.cs
- ResourceReferenceKeyNotFoundException.cs
- XpsException.cs
- SqlStream.cs
- ListViewDeletedEventArgs.cs
- MarkerProperties.cs
- WindowsServiceCredential.cs
- DiagnosticsConfiguration.cs
- HealthMonitoringSectionHelper.cs
- ActivityDesignerLayoutSerializers.cs
- StandardOleMarshalObject.cs
- ProcessModelSection.cs
- RectValueSerializer.cs
- DayRenderEvent.cs
- TableItemPatternIdentifiers.cs
- ExpressionEditorAttribute.cs
- DataGridViewImageColumn.cs
- RijndaelManagedTransform.cs
- Boolean.cs
- objectresult_tresulttype.cs
- HttpHostedTransportConfiguration.cs
- PointHitTestParameters.cs
- BitmapCacheBrush.cs
- DictionaryItemsCollection.cs
- SessionStateUtil.cs
- PackageProperties.cs
- RIPEMD160Managed.cs
- PrinterSettings.cs
- MessageBodyDescription.cs
- securitycriticaldataClass.cs
- ButtonField.cs
- FormViewInsertEventArgs.cs
- ApplicationFileParser.cs
- ScriptingRoleServiceSection.cs
- SessionPageStateSection.cs
- EncodedStreamFactory.cs
- CodeAccessSecurityEngine.cs
- XmlWriter.cs
- ResourceContainer.cs
- GridViewColumnHeaderAutomationPeer.cs
- InitializerFacet.cs
- remotingproxy.cs
- _ScatterGatherBuffers.cs
- Encoder.cs
- TreeNodeBindingCollection.cs
- TrackingConditionCollection.cs
- MultiAsyncResult.cs
- ValidationError.cs
- ImageCodecInfoPrivate.cs
- BeginStoryboard.cs
- MergeFilterQuery.cs
- ServicesUtilities.cs
- SearchForVirtualItemEventArgs.cs
- TraceSection.cs
- SecurityHelper.cs
- _SSPISessionCache.cs
- DynamicFilter.cs
- SymbolPair.cs
- InvocationExpression.cs
- HorizontalAlignConverter.cs
- XmlRawWriter.cs
- HttpResponse.cs
- WinEventTracker.cs
- ModuleBuilderData.cs
- SubclassTypeValidatorAttribute.cs
- SchemaMapping.cs
- RangeValidator.cs
- Graphics.cs
- DelegatedStream.cs
- ResourceSet.cs