ComponentChangedEventHandler Delegate

Definition

Namespace:

System.ComponentModel.Design

Assemblies:

netstandard.dll, System.ComponentModel.TypeConverter.dll

Represents the method that will handle a ComponentChanged event.

C#

public delegate void ComponentChangedEventHandler(object? sender, ComponentChangedEventArgs e);

Parameters

sender

Object

The source of the event.

e

ComponentChangedEventArgs

A ComponentChangedEventArgs that contains the event data.

Examples

This example demonstrates registering a ComponentChangedEventHandler and handling the ComponentChanged event.

C#

public void LinkComponentChangedEvent(IComponentChangeService changeService)
{
    // Registers an event handler for the ComponentChanged event.
    changeService.ComponentChanged += new ComponentChangedEventHandler(this.OnComponentChanged);            
}

private void OnComponentChanged(object sender, ComponentChangedEventArgs e)
{
    // Displays changed component information on the console.
    Console.WriteLine("Type of the component that has changed: "+e.Component.GetType().FullName);      
    Console.WriteLine("Name of the member of the component that has changed: "+e.Member.Name);            
    Console.WriteLine("Old value of the member: "+e.OldValue.ToString());
    Console.WriteLine("New value of the member: "+e.NewValue.ToString());
}

Remarks

When you create a ComponentChangedEventHandler 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. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Handling and Raising Events.

A ComponentChanged event will not occur during the loading or unloading of a form because changes are expected during these operations.

Extension Methods

GetMethodInfo(Delegate)

Gets an object that represents the method represented by the specified delegate.

Applies to

See also

• ComponentChanged
• ComponentChanging
• ComponentChangedEventArgs
• IComponentChangeService