Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / EventHandlerList.cs / 1 / EventHandlerList.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.Diagnostics.CodeAnalysis; using System.Security.Permissions; ////// [HostProtection(SharedState = true)] public sealed class EventHandlerList : IDisposable { ListEntry head; Component parent; ///Provides a simple list of delegates. This class cannot be inherited. ////// Creates a new event handler list. /// [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] public EventHandlerList() { } ////// Creates a new event handler list. The parent component is used to check the component's /// CanRaiseEvents property. /// [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] internal EventHandlerList(Component parent) { this.parent = parent; } ////// public Delegate this[object key] { [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] get { ListEntry e = null; if (parent == null || parent.CanRaiseEventsInternal) { e = Find(key); } if (e != null) { return e.handler; } else { return null; } } set { ListEntry e = Find(key); if (e != null) { e.handler = value; } else { head = new ListEntry(key, value, head); } } } ///Gets or sets the delegate for the specified key. ////// [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] public void AddHandler(object key, Delegate value) { ListEntry e = Find(key); if (e != null) { e.handler = Delegate.Combine(e.handler, value); } else { head = new ListEntry(key, value, head); } } ///[To be supplied.] ///allows you to add a list of events to this list public void AddHandlers(EventHandlerList listToAddFrom) { ListEntry currentListEntry = listToAddFrom.head; while (currentListEntry != null) { AddHandler(currentListEntry.key, currentListEntry.handler); currentListEntry = currentListEntry.next; } } ////// public void Dispose() { head = null; } private ListEntry Find(object key) { ListEntry found = head; while (found != null) { if (found.key == key) { break; } found = found.next; } return found; } ///[To be supplied.] ////// [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] public void RemoveHandler(object key, Delegate value) { ListEntry e = Find(key); if (e != null) { e.handler = Delegate.Remove(e.handler, value); } // else... no error for removal of non-existant delegate // } private sealed class ListEntry { internal ListEntry next; internal object key; internal Delegate handler; public ListEntry(object key, Delegate handler, ListEntry next) { this.next = next; this.key = key; this.handler = handler; } } } }[To be supplied.] ///
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- AssemblyAttributes.cs
- Ipv6Element.cs
- SourceLineInfo.cs
- SqlDataSourceStatusEventArgs.cs
- QuaternionKeyFrameCollection.cs
- GlyphInfoList.cs
- MetricEntry.cs
- FileDetails.cs
- AnimationClockResource.cs
- HttpProtocolImporter.cs
- Unit.cs
- Size3DValueSerializer.cs
- UrlPropertyAttribute.cs
- SafeRightsManagementEnvironmentHandle.cs
- UriScheme.cs
- StringFreezingAttribute.cs
- SHA256Managed.cs
- COM2IManagedPerPropertyBrowsingHandler.cs
- SpellerHighlightLayer.cs
- OracleMonthSpan.cs
- IPipelineRuntime.cs
- ZoomPercentageConverter.cs
- DataGridViewTextBoxCell.cs
- TimelineClockCollection.cs
- GeneratedView.cs
- WebPartMenu.cs
- Point3DKeyFrameCollection.cs
- ProfileModule.cs
- TextSyndicationContent.cs
- GrammarBuilderBase.cs
- DataGridGeneralPage.cs
- DriveNotFoundException.cs
- NetSectionGroup.cs
- Vector3D.cs
- VirtualPathUtility.cs
- ImportCatalogPart.cs
- ControlDesignerState.cs
- Point3DAnimationUsingKeyFrames.cs
- TypeTypeConverter.cs
- Int32Animation.cs
- DesignerActionItem.cs
- DefaultTextStore.cs
- Vars.cs
- OdbcConnectionPoolProviderInfo.cs
- PtsHost.cs
- HeaderCollection.cs
- externdll.cs
- ReceiveContent.cs
- SchemaImporter.cs
- WindowsAuthenticationEventArgs.cs
- CursorInteropHelper.cs
- RadioButton.cs
- GZipStream.cs
- DecimalStorage.cs
- TreeView.cs
- ControlParameter.cs
- HtmlTable.cs
- DesignerOptionService.cs
- FixedSchema.cs
- ColorContext.cs
- _ConnectionGroup.cs
- ColumnHeaderCollectionEditor.cs
- BuildManager.cs
- EditorBrowsableAttribute.cs
- ReflectionServiceProvider.cs
- SqlDeflator.cs
- CompilerState.cs
- PageRanges.cs
- _Win32.cs
- CellRelation.cs
- Classification.cs
- WorkflowElementDialogWindow.xaml.cs
- PrintPreviewControl.cs
- CharAnimationBase.cs
- Decimal.cs
- XamlFigureLengthSerializer.cs
- FrameSecurityDescriptor.cs
- FormViewCommandEventArgs.cs
- ApplicationInfo.cs
- SmiEventSink_Default.cs
- PartitionResolver.cs
- DbgUtil.cs
- TextInfo.cs
- BlockExpression.cs
- DateTimeFormatInfo.cs
- MaskDescriptor.cs
- SmtpMail.cs
- HiddenFieldPageStatePersister.cs
- HGlobalSafeHandle.cs
- CollectionType.cs
- ChannelSinkStacks.cs
- DateTimeUtil.cs
- SourceCollection.cs
- CommandDevice.cs
- TransformedBitmap.cs
- ParsedAttributeCollection.cs
- ClientTargetCollection.cs
- PermissionRequestEvidence.cs
- DecimalSumAggregationOperator.cs
- Typeface.cs