EventHandlerList Class (System.ComponentModel)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

EventHandlerList Class

Provides a simple list of delegates. This class cannot be inherited.

Namespace: System.ComponentModel
Assembly: System (in System.dll)

Syntax

Visual Basic (Declaration)

<HostProtectionAttribute(SecurityAction.LinkDemand, SharedState := True)> _
Public NotInheritable Class EventHandlerList _
    Implements IDisposable

Visual Basic (Usage)

Dim instance As EventHandlerList

[HostProtectionAttribute(SecurityAction.LinkDemand, SharedState = true)]
public sealed class EventHandlerList : IDisposable

Visual C++

[HostProtectionAttribute(SecurityAction::LinkDemand, SharedState = true)]
public ref class EventHandlerList sealed : IDisposable

JScript

public final class EventHandlerList implements IDisposable

Remarks

Note:
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

Note:

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

This class uses a linear search algorithm to find entries in the list of delegates. A linear search algorithm is inefficient when working with a large number of entries. Therefore, when you have a large list, finding entries is slow.

Examples

For an example of using an EventHandlerList, see How to: Handle Multiple Events Using Event Properties.

Inheritance Hierarchy

System..::.Object
System.ComponentModel..::.EventHandlerList

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Reference

EventHandlerList Members

System.ComponentModel Namespace