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DependencyObject.RemoveHandler Method

Removes an EventHandler from an associated DependencyProperty.

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

public void RemoveHandler(
	DependencyProperty dependencyEvent,
	Object value
)

Parameters

dependencyEvent
Type: System.Workflow.ComponentModel.DependencyProperty

The DependencyProperty.

value
Type: System.Object

The Object representing the value of this property. In this case, a Delegate type.

ExceptionCondition
ArgumentNullException

Either of the arguments is a null reference (Nothing in Visual Basic).

ArgumentException

The dependencyEvent is a metaproperty.

ArgumentException

The dependencyEvent is not an event.

ReadOnlyException

The value is a ActivityBind and this instance is not in DesignMode.

Provided as a convenient direct method for removing an event delegate.

When you create a delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. Unless you remove the delegate, the event handler is called whenever the event occurs. For more information about event-handler delegates, see Events and Delegates.

Handlers are added and removed using the following code. See Send E-mail Activity Sample for more information.

#region Public Events

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
[Description("The SendingEmail event is raised before an email is sent through SMTP.")]
[Category(EventsCategory)]
[Browsable(true)]
public event EventHandler SendingEmail
{
    add
    {
        base.AddHandler(SendEmailActivity.SendingEmailEvent, value);
    }
    remove
    {
        base.RemoveHandler(SendEmailActivity.SendingEmailEvent, value);
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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.

.NET Framework

Supported in: 3.5, 3.0

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