EventInfo.AddEventHandler Method

Adds an event handler to an event source.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

public void AddEventHandler (
	Object target,
	Delegate handler
public final void AddEventHandler (
	Object target, 
	Delegate handler
public final function AddEventHandler (
	target : Object, 
	handler : Delegate



The event source.


Encapsulates a method or methods to be invoked when the event is raised by the target.

Exception typeCondition


The event does not have a public add accessor.


The handler that was passed in cannot be used.


The caller does not have access permission to the member.


The target parameter is a null reference (Nothing in Visual Basic) and the event is not static.


The EventInfo is not declared on the target.

This method attempts to add a delegate to synchronize the event on the target object.

Each time the event is raised by the target parameter, the method or methods encapsulated by the handler will be invoked.

  • ReflectionPermission  when invoked late-bound through mechanisms such as Type.InvokeMember. Associated enumeration: ReflectionPermissionFlag.MemberAccess.
  • ReflectionPermission  for reflecting non-public objects. Associated enumeration: ReflectionPermissionFlag.MemberAccess

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

Community Additions