Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / ObjectModel / KeyedCollection.cs / 1305376 / KeyedCollection.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // namespace System.Collections.ObjectModel { using System; using System.Collections.Generic; using System.Diagnostics; using System.Diagnostics.Contracts; [Serializable] [System.Runtime.InteropServices.ComVisible(false)] [DebuggerTypeProxy(typeof(Mscorlib_KeyedCollectionDebugView<,>))] [DebuggerDisplay("Count = {Count}")] public abstract class KeyedCollection: Collection { const int defaultThreshold = 0; IEqualityComparer comparer; Dictionary dict; int keyCount; int threshold; protected KeyedCollection(): this(null, defaultThreshold) {} protected KeyedCollection(IEqualityComparer comparer): this(comparer, defaultThreshold) {} protected KeyedCollection(IEqualityComparer comparer, int dictionaryCreationThreshold) { if (comparer == null) { comparer = EqualityComparer .Default; } if (dictionaryCreationThreshold == -1) { dictionaryCreationThreshold = int.MaxValue; } if( dictionaryCreationThreshold < -1) { ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.dictionaryCreationThreshold, ExceptionResource.ArgumentOutOfRange_InvalidThreshold); } this.comparer = comparer; this.threshold = dictionaryCreationThreshold; } public IEqualityComparer Comparer { get { return comparer; } } public TItem this[TKey key] { get { if( key == null) { ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key); } if (dict != null) { return dict[key]; } foreach (TItem item in Items) { if (comparer.Equals(GetKeyForItem(item), key)) return item; } ThrowHelper.ThrowKeyNotFoundException(); return default(TItem); } } public bool Contains(TKey key) { if( key == null) { ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key); } if (dict != null) { return dict.ContainsKey(key); } if (key != null) { foreach (TItem item in Items) { if (comparer.Equals(GetKeyForItem(item), key)) return true; } } return false; } private bool ContainsItem(TItem item) { TKey key; if( (dict == null) || ((key = GetKeyForItem(item)) == null)) { return Items.Contains(item); } TItem itemInDict; bool exist = dict.TryGetValue(key, out itemInDict); if( exist) { return EqualityComparer .Default.Equals(itemInDict, item); } return false; } public bool Remove(TKey key) { if( key == null) { ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key); } if (dict != null) { if (dict.ContainsKey(key)) { return Remove(dict[key]); } return false; } if (key != null) { for (int i = 0; i < Items.Count; i++) { if (comparer.Equals(GetKeyForItem(Items[i]), key)) { RemoveItem(i); return true; } } } return false; } protected IDictionary Dictionary { get { return dict; } } protected void ChangeItemKey(TItem item, TKey newKey) { // check if the item exists in the collection if( !ContainsItem(item)) { ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_ItemNotExist); } TKey oldKey = GetKeyForItem(item); if (!comparer.Equals(oldKey, newKey)) { if (newKey != null) { AddKey(newKey, item); } if (oldKey != null) { RemoveKey(oldKey); } } } protected override void ClearItems() { base.ClearItems(); if (dict != null) { dict.Clear(); } keyCount = 0; } protected abstract TKey GetKeyForItem(TItem item); protected override void InsertItem(int index, TItem item) { TKey key = GetKeyForItem(item); if (key != null) { AddKey(key, item); } base.InsertItem(index, item); } protected override void RemoveItem(int index) { TKey key = GetKeyForItem(Items[index]); if (key != null) { RemoveKey(key); } base.RemoveItem(index); } protected override void SetItem(int index, TItem item) { TKey newKey = GetKeyForItem(item); TKey oldKey = GetKeyForItem(Items[index]); if (comparer.Equals(oldKey, newKey)) { if (newKey != null && dict != null) { dict[newKey] = item; } } else { if (newKey != null) { AddKey(newKey, item); } if (oldKey != null) { RemoveKey(oldKey); } } base.SetItem(index, item); } private void AddKey(TKey key, TItem item) { if (dict != null) { dict.Add(key, item); } else if (keyCount == threshold) { CreateDictionary(); dict.Add(key, item); } else { if (Contains(key)) { ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_AddingDuplicate); } keyCount++; } } private void CreateDictionary() { dict = new Dictionary (comparer); foreach (TItem item in Items) { TKey key = GetKeyForItem(item); if (key != null) { dict.Add(key, item); } } } private void RemoveKey(TKey key) { Contract.Assert(key != null, "key shouldn't be null!"); if (dict != null) { dict.Remove(key); } else { keyCount--; } } } } // 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
- FormViewInsertedEventArgs.cs
- AlignmentXValidation.cs
- codemethodreferenceexpression.cs
- UncommonField.cs
- XmlSerializableReader.cs
- TraceContextRecord.cs
- WebPartUserCapability.cs
- MemberDomainMap.cs
- NavigationService.cs
- DataGridViewCellLinkedList.cs
- OdbcConnectionHandle.cs
- RewritingProcessor.cs
- AttributeProviderAttribute.cs
- CssClassPropertyAttribute.cs
- RepeaterItemCollection.cs
- AnnotationService.cs
- TypeReference.cs
- ObjectStateEntryBaseUpdatableDataRecord.cs
- FrameworkObject.cs
- InternalRelationshipCollection.cs
- InlineCollection.cs
- Scene3D.cs
- IISMapPath.cs
- HtmlControl.cs
- OlePropertyStructs.cs
- ValidationManager.cs
- EmptyQuery.cs
- ResourceReferenceExpressionConverter.cs
- DataSetViewSchema.cs
- CollectionViewSource.cs
- EditorBrowsableAttribute.cs
- StorageFunctionMapping.cs
- DriveInfo.cs
- ExpressionConverter.cs
- Operator.cs
- Oid.cs
- PackageRelationshipSelector.cs
- RankException.cs
- XsdValidatingReader.cs
- LinqDataSourceUpdateEventArgs.cs
- OdbcCommand.cs
- SqlServices.cs
- EndCreateSecurityTokenRequest.cs
- Model3D.cs
- OdbcTransaction.cs
- ExpressionBuilderCollection.cs
- PackWebRequest.cs
- SoapExtensionImporter.cs
- AnnotationHelper.cs
- Typeface.cs
- Preprocessor.cs
- SchemaImporterExtension.cs
- BamlWriter.cs
- Rule.cs
- SqlCacheDependencyDatabaseCollection.cs
- AdPostCacheSubstitution.cs
- TypedTableBaseExtensions.cs
- SelectionRangeConverter.cs
- AnimatedTypeHelpers.cs
- TextEffectCollection.cs
- IconBitmapDecoder.cs
- DialogResultConverter.cs
- ELinqQueryState.cs
- OleStrCAMarshaler.cs
- LineServicesCallbacks.cs
- VariableQuery.cs
- ExpressionVisitor.cs
- FixedFindEngine.cs
- SchemaElementDecl.cs
- AppendHelper.cs
- RoleService.cs
- XmlParser.cs
- ResourceDefaultValueAttribute.cs
- PartialTrustValidationBehavior.cs
- Rules.cs
- Decimal.cs
- ImageDrawing.cs
- Int32Rect.cs
- SqlEnums.cs
- XamlSerializerUtil.cs
- DBCSCodePageEncoding.cs
- DataConnectionHelper.cs
- AsymmetricSecurityBindingElement.cs
- control.ime.cs
- XLinq.cs
- EnumMember.cs
- ProviderMetadataCachedInformation.cs
- MouseGestureValueSerializer.cs
- StreamResourceInfo.cs
- RequestStatusBarUpdateEventArgs.cs
- ThicknessAnimationBase.cs
- RequestCachePolicyConverter.cs
- LocalizableAttribute.cs
- ContentIterators.cs
- GroupLabel.cs
- StandardCommands.cs
- TrackingMemoryStream.cs
- VarRefManager.cs
- Rectangle.cs
- InputLanguageCollection.cs