Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / EntitySetDataBindingList.cs / 1305376 / EntitySetDataBindingList.cs
using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Reflection; using System.Diagnostics.CodeAnalysis; namespace System.Data.Linq { internal class EntitySetBindingList: SortableBindingList where TEntity : class { private EntitySet data; private TEntity addNewInstance; private TEntity cancelNewInstance; private bool addingNewInstance; internal EntitySetBindingList(IList sequence, EntitySet data) : base(sequence) { if (sequence == null) { throw Error.ArgumentNull("sequence"); } if (data == null) { throw Error.ArgumentNull("data"); } this.data = data; } [SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic", Justification="Unknown reason.")] private void ThrowEntitySetErrorsIfTypeInappropriate() { Type type = typeof(TEntity); if (type.IsAbstract) { throw Error.EntitySetDataBindingWithAbstractBaseClass(type.Name); } if (type.GetConstructor(System.Type.EmptyTypes) == null) { throw Error.EntitySetDataBindingWithNonPublicDefaultConstructor(type.Name); } } protected override object AddNewCore() { ThrowEntitySetErrorsIfTypeInappropriate(); addingNewInstance = true; addNewInstance = (TEntity)base.AddNewCore(); return addNewInstance; } protected override void InsertItem(int index, TEntity item) { base.InsertItem(index, item); if (!addingNewInstance && index >= 0 && index <= Count) { this.data.Insert(index, item); } } protected override void RemoveItem(int index) { if (index >= 0 && index < Count && this[index] == cancelNewInstance) { cancelNewInstance = null; } else { this.data.Remove(this[index]); } base.RemoveItem(index); } protected override void SetItem(int index, TEntity item) { TEntity removedItem = this[index]; base.SetItem(index, item); if (index >= 0 && index < Count) { //Check to see if the user is trying to set an item that is currently being added via AddNew //If so then the list should not continue the AddNew; but instead add the item //that is being passed in. if (removedItem == addNewInstance) { addNewInstance = null; addingNewInstance = false; } else { this.data.Remove(removedItem); } this.data.Insert(index,item); } } protected override void ClearItems() { this.data.Clear(); base.ClearItems(); } public override void EndNew(int itemIndex) { if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) { this.data.Add(addNewInstance); addNewInstance = null; addingNewInstance = false; } base.EndNew(itemIndex); } public override void CancelNew(int itemIndex) { if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) { cancelNewInstance = addNewInstance; addNewInstance = null; addingNewInstance = false; } base.CancelNew(itemIndex); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Reflection; using System.Diagnostics.CodeAnalysis; namespace System.Data.Linq { internal class EntitySetBindingList : SortableBindingList where TEntity : class { private EntitySet data; private TEntity addNewInstance; private TEntity cancelNewInstance; private bool addingNewInstance; internal EntitySetBindingList(IList sequence, EntitySet data) : base(sequence) { if (sequence == null) { throw Error.ArgumentNull("sequence"); } if (data == null) { throw Error.ArgumentNull("data"); } this.data = data; } [SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic", Justification="Unknown reason.")] private void ThrowEntitySetErrorsIfTypeInappropriate() { Type type = typeof(TEntity); if (type.IsAbstract) { throw Error.EntitySetDataBindingWithAbstractBaseClass(type.Name); } if (type.GetConstructor(System.Type.EmptyTypes) == null) { throw Error.EntitySetDataBindingWithNonPublicDefaultConstructor(type.Name); } } protected override object AddNewCore() { ThrowEntitySetErrorsIfTypeInappropriate(); addingNewInstance = true; addNewInstance = (TEntity)base.AddNewCore(); return addNewInstance; } protected override void InsertItem(int index, TEntity item) { base.InsertItem(index, item); if (!addingNewInstance && index >= 0 && index <= Count) { this.data.Insert(index, item); } } protected override void RemoveItem(int index) { if (index >= 0 && index < Count && this[index] == cancelNewInstance) { cancelNewInstance = null; } else { this.data.Remove(this[index]); } base.RemoveItem(index); } protected override void SetItem(int index, TEntity item) { TEntity removedItem = this[index]; base.SetItem(index, item); if (index >= 0 && index < Count) { //Check to see if the user is trying to set an item that is currently being added via AddNew //If so then the list should not continue the AddNew; but instead add the item //that is being passed in. if (removedItem == addNewInstance) { addNewInstance = null; addingNewInstance = false; } else { this.data.Remove(removedItem); } this.data.Insert(index,item); } } protected override void ClearItems() { this.data.Clear(); base.ClearItems(); } public override void EndNew(int itemIndex) { if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) { this.data.Add(addNewInstance); addNewInstance = null; addingNewInstance = false; } base.EndNew(itemIndex); } public override void CancelNew(int itemIndex) { if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) { cancelNewInstance = addNewInstance; addNewInstance = null; addingNewInstance = false; } base.CancelNew(itemIndex); } } } // 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
- ExpressionBuilderContext.cs
- QuaternionRotation3D.cs
- ClickablePoint.cs
- CornerRadius.cs
- StoreAnnotationsMap.cs
- SoapInteropTypes.cs
- DataGridBoolColumn.cs
- BinHexEncoding.cs
- RayHitTestParameters.cs
- SignatureResourcePool.cs
- SystemBrushes.cs
- NotImplementedException.cs
- Conditional.cs
- UnmanagedMemoryStream.cs
- DbMetaDataCollectionNames.cs
- HtmlTextArea.cs
- SingleObjectCollection.cs
- Codec.cs
- AnimationException.cs
- HyperLinkDataBindingHandler.cs
- Messages.cs
- ClientSettingsStore.cs
- CodeArrayIndexerExpression.cs
- PixelShader.cs
- EncodingNLS.cs
- DataGridViewDataErrorEventArgs.cs
- FullTextBreakpoint.cs
- MemoryFailPoint.cs
- TagNameToTypeMapper.cs
- RealProxy.cs
- CharStorage.cs
- IBuiltInEvidence.cs
- AgileSafeNativeMemoryHandle.cs
- ContentHostHelper.cs
- WbemProvider.cs
- TraceUtils.cs
- WinEventQueueItem.cs
- BulletedListEventArgs.cs
- DecoderFallbackWithFailureFlag.cs
- SqlDataSourceEnumerator.cs
- Int32AnimationUsingKeyFrames.cs
- ArraySortHelper.cs
- BamlLocalizabilityResolver.cs
- EntryIndex.cs
- _SpnDictionary.cs
- QilTernary.cs
- TTSVoice.cs
- CollectionBase.cs
- WrappedDispatcherException.cs
- ListBoxAutomationPeer.cs
- WebScriptMetadataMessageEncoderFactory.cs
- ClientTarget.cs
- EarlyBoundInfo.cs
- RawMouseInputReport.cs
- StylusPointProperty.cs
- NetMsmqSecurity.cs
- PolygonHotSpot.cs
- Config.cs
- RegionData.cs
- PropertyBuilder.cs
- oledbconnectionstring.cs
- GACMembershipCondition.cs
- XmlEnumAttribute.cs
- ListControlBoundActionList.cs
- DataViewManagerListItemTypeDescriptor.cs
- AccessorTable.cs
- RSAPKCS1KeyExchangeDeformatter.cs
- Label.cs
- TextTreeNode.cs
- WrappedReader.cs
- StorageEntitySetMapping.cs
- AuthenticationModuleElement.cs
- ScriptHandlerFactory.cs
- DiscoveryClientDuplexChannel.cs
- PropertyEmitter.cs
- ISFTagAndGuidCache.cs
- TextEffectResolver.cs
- SQLSingle.cs
- __ConsoleStream.cs
- ObjectListCommand.cs
- XpsInterleavingPolicy.cs
- SelectionItemProviderWrapper.cs
- BookmarkNameHelper.cs
- QilIterator.cs
- SEHException.cs
- HttpContext.cs
- CrossSiteScriptingValidation.cs
- CodeIdentifiers.cs
- XmlWriter.cs
- CapabilitiesState.cs
- ToolStripHighContrastRenderer.cs
- ToolStripTextBox.cs
- ProfileService.cs
- SchemaMerger.cs
- Inline.cs
- GenericRootAutomationPeer.cs
- SessionStateSection.cs
- SchemaElement.cs
- CanonicalFontFamilyReference.cs
- Socket.cs